Chapter 1: Introduction
|
|
- Felicia Sims
- 5 years ago
- Views:
Transcription
1 Chapter 1: Introduction Definition: A differential equation is an equation involving the derivative of a function. If the function depends on a single variable, then only ordinary derivatives appear and the equation is called an ordinary differential equation (ODE). If the function depends on several variables, then partial derivatives appear and the equation is called a partial differential equation (PDE). A function that satisfies a differential equation is called a solution of the differential equation. Example: Verify that y 1 (t) = e 3t and y 2 (t) = e t are solutions of the ODE y + 2y 3y = 0. Example: Verify that u(x, t) = e 4t sin x is a solution of the PDE 4u xx u t = 0. 1
2 Example: Determine the values of r for which the differential equation y 3y + 2y = 0 has a solution of the form y = e rt. Example: Determine the values of r for which the differential equation t 2 y 4ty + 4y = 0 has a solution of the form y = t r for t > 0. 2
3 Classification of Differential Equations Definition: The order of a differential equation is the order of the highest derivative that appears in the equation. If a differential equation can be written as a linear combination of the unknown function and its derivatives, it is called linear. The general form of a linear ordinary differential equation is a 0 (t)y (n) + a 1 (t)y (n 1) + + a n (t)y = g(t). A differential equation that is not linear is called nonlinear. Example: Classify each differential equation as an ordinary or partial differential equation. Determine the order of each differential equation and whether the equation is linear or nonlinear. (a) (1 + y 2 ) d2 y dt 2 + tdy dt + y = et (b) d3 y dt 3 + tdy dt + (cos2 t)y = t 3 (c) u xx + u yy + u x + 2u = 0 (d) u t + uu x = 1 + u xx 3
4 Mathematical Models Definition: A differential equation that describes a physical process is called a mathematical model of the process. Example: A tank initially contains 100 L of pure water. A mixture containing 0.2 kg/l of salt enters the tank at a rate of 2 L/min, and the well-mixed solution leaves the tank at the same rate. (a) Find a differential equation for the amount of salt in the tank after t minutes. (b) Find the general solution of this differential equation. The differential equation has infinitely many solutions. The geometric representation of these solutions is an infinite family of curves called integral curves. 4
5 If we know the initial amount of salt in the tank, then the solution is unique. (c) Suppose that the tank initially contains 100 L of pure water. Find the solution of the differential equation. The condition we used to find the value of C is called an initial condition. The differential equation, together with this initial condition, is an initial value problem. (d) How much salt is in the tank after a long time? 5
6 Direction Fields and Equilibrium Solutions Consider a differential equation of the form dy dt = f(t, y). The derivative, y, represents the slope of the tangent line to the graph of y(t). By choosing a lattice of points (t, y) in the ty-plane and sketching line segments with slopes y, we obtain a direction field describing the overall behavior of solutions of the equation. Example: Draw a direction field for the differential equation y = y 2. Based on the direction field, determine the behavior of y as t. Definition: An equilibrium solution of a differential equation is a solution from which there is no change. That is, a solution y(t) for which dy dt = y = 0. Solutions may approach or move away from an equilibrium solution over time. 6
7 Matlab can be used to plot the direction field for a given differential equation along with some of the solution curves. Suppose that we would like to plot the direction field for the differential equation dy dt = 2y + t2 e 2t in the rectangle defined by 0 < t < 5, 3 < y < 3. The following Matlab script can be used to generate the direction field. % Math Differential Equations % Creates a grid of uniformly spaced points in the rectangle. [T,Y] = meshgrid(0:0.5:5,-3:0.5:3); % Defines the right-hand side of the differential equation. S = 2*Y+T.^2.*exp(-2*T); % Scales the direction field. L = sqrt(1+s.^2); % Plots the scaled direction field. q = quiver(t,y,1./l,s./l,0.5); % Plot information axis tight xlabel( t ) ylabel( y ) y t Note: An more detailed version of this script can be downloaded from the course website. 7
8 Example: Draw a direction field for the differential equation y = 2y 3. Based on the direction field, determine the behavior of y as t. If this behavior depends on the initial value of y at t = 0, describe this dependency y t Example: Draw a direction field for the differential equation y = y(y 5). Based on the direction field, determine the behavior of y as t. If this behavior depends on the initial value of y at t = 0, describe this dependency. y t 8
2.1 Differential Equations and Solutions. Blerina Xhabli
2.1 Math 3331 Differential Equations 2.1 Differential Equations and Solutions Blerina Xhabli Department of Mathematics, University of Houston blerina@math.uh.edu math.uh.edu/ blerina/teaching.html Blerina
More informationMATH 308 Differential Equations
MATH 308 Differential Equations Summer, 2014, SET 1 JoungDong Kim Set 1: Section 1.1, 1.2, 1.3, 2.1 Chapter 1. Introduction 1. Why do we study Differential Equation? Many of the principles, or laws, underlying
More informationMath Applied Differential Equations
Math 256 - Applied Differential Equations Notes Basic Definitions and Concepts A differential equation is an equation that involves one or more of the derivatives (first derivative, second derivative,
More informationSection 2.1 Differential Equation and Solutions
Section 2.1 Differential Equation and Solutions Key Terms: Ordinary Differential Equation (ODE) Independent Variable Order of a DE Partial Differential Equation (PDE) Normal Form Solution General Solution
More informationHomework Solutions:
Homework Solutions: 1.1-1.3 Section 1.1: 1. Problems 1, 3, 5 In these problems, we want to compare and contrast the direction fields for the given (autonomous) differential equations of the form y = ay
More informationMath 392 Exam 1 Solutions Fall (10 pts) Find the general solution to the differential equation dy dt = 1
Math 392 Exam 1 Solutions Fall 20104 1. (10 pts) Find the general solution to the differential equation = 1 y 2 t + 4ty = 1 t(y 2 + 4y). Hence (y 2 + 4y) = t y3 3 + 2y2 = ln t + c. 2. (8 pts) Perform Euler
More informationSolution. Your sketch should show both x and y axes marked from 5 to 5 and circles of radius 1, 3, and 5 centered at the origin.
Solutions of the Sample Problems for the First In-Class Exam Math 246, Fall 208, Professor David Levermore () (a) Sketch the graph that would be produced by the following Matlab command. fplot(@(t) 2/t,
More informationSolutions of Math 53 Midterm Exam I
Solutions of Math 53 Midterm Exam I Problem 1: (1) [8 points] Draw a direction field for the given differential equation y 0 = t + y. (2) [8 points] Based on the direction field, determine the behavior
More informationSolutions of the Sample Problems for the First In-Class Exam Math 246, Fall 2017, Professor David Levermore
Solutions of the Sample Problems for the First In-Class Exam Math 246, Fall 207, Professor David Levermore () (a) Give the integral being evaluated by the following Matlab command. int( x/(+xˆ4), x,0,inf)
More informationDON T PANIC! If you get stuck, take a deep breath and go on to the next question. Come back to the question you left if you have time at the end.
Math 307A, Midterm 1 Spring 2013 Name: Instructions. DON T PANIC! If you get stuck, take a deep breath and go on to the next question. Come back to the question you left if you have time at the end. There
More information. For each initial condition y(0) = y 0, there exists a. unique solution. In fact, given any point (x, y), there is a unique curve through this point,
1.2. Direction Fields: Graphical Representation of the ODE and its Solution Section Objective(s): Constructing Direction Fields. Interpreting Direction Fields. Definition 1.2.1. A first order ODE of the
More information= 2e t e 2t + ( e 2t )e 3t = 2e t e t = e t. Math 20D Final Review
Math D Final Review. Solve the differential equation in two ways, first using variation of parameters and then using undetermined coefficients: Corresponding homogenous equation: with characteristic equation
More informationHomogeneous Equations with Constant Coefficients
Homogeneous Equations with Constant Coefficients MATH 365 Ordinary Differential Equations J. Robert Buchanan Department of Mathematics Spring 2018 General Second Order ODE Second order ODEs have the form
More informationMath 308, Sections 301, 302, Summer 2008 Review before Test I 06/09/2008
Math 308, Sections 301, 302, Summer 2008 Review before Test I 06/09/2008 Chapter 1. Introduction Section 1.1 Background Definition Equation that contains some derivatives of an unknown function is called
More informationMath Homework 3 Solutions. (1 y sin x) dx + (cos x) dy = 0. = sin x =
2.6 #10: Determine if the equation is exact. If so, solve it. Math 315-01 Homework 3 Solutions (1 y sin x) dx + (cos x) dy = 0 Solution: Let P (x, y) = 1 y sin x and Q(x, y) = cos x. Note P = sin x = Q
More information1.2. Direction Fields: Graphical Representation of the ODE and its Solution Let us consider a first order differential equation of the form dy
.. Direction Fields: Graphical Representation of the ODE and its Solution Let us consider a first order differential equation of the form dy = f(x, y). In this section we aim to understand the solution
More informationGraded and supplementary homework, Math 2584, Section 4, Fall 2017
Graded and supplementary homework, Math 2584, Section 4, Fall 2017 (AB 1) (a) Is y = cos(2x) a solution to the differential equation d2 y + 4y = 0? dx2 (b) Is y = e 2x a solution to the differential equation
More informationDifferential equations
Differential equations Math 27 Spring 2008 In-term exam February 5th. Solutions This exam contains fourteen problems numbered through 4. Problems 3 are multiple choice problems, which each count 6% of
More informationVANDERBILT UNIVERSITY. MATH 2610 ORDINARY DIFFERENTIAL EQUATIONS Practice for test 1 solutions
VANDERBILT UNIVERSITY MATH 2610 ORDINARY DIFFERENTIAL EQUATIONS Practice for test 1 solutions The first test will cover all material discussed up to (including) section 4.5. Important: The solutions below
More informationMath 2214 Solution Test 1D Spring 2015
Math 2214 Solution Test 1D Spring 2015 Problem 1: A 600 gallon open top tank initially holds 300 gallons of fresh water. At t = 0, a brine solution containing 3 lbs of salt per gallon is poured into the
More informationThe Fundamental Theorem of Calculus: Suppose f continuous on [a, b]. 1.) If G(x) = x. f(t)dt = F (b) F (a) where F is any antiderivative
1 Calulus pre-requisites you must know. Derivative = slope of tangent line = rate. Integral = area between curve and x-axis (where area can be negative). The Fundamental Theorem of Calculus: Suppose f
More informationMATH 2410 PRACTICE PROBLEMS FOR FINAL EXAM
MATH 2410 PRACTICE PROBLEMS FOR FINAL EXAM Date and place: Saturday, December 16, 2017. Section 001: 3:30-5:30 pm at MONT 225 Section 012: 8:00-10:00am at WSRH 112. Material covered: Lectures, quizzes,
More informationFINAL EXAM CALCULUS 2. Name PRACTICE EXAM
FINAL EXAM CALCULUS 2 MATH 2300 FALL 208 Name PRACTICE EXAM Please answer all of the questions, and show your work. You must explain your answers to get credit. You will be graded on the clarity of your
More informationMath 232, Final Test, 20 March 2007
Math 232, Final Test, 20 March 2007 Name: Instructions. Do any five of the first six questions, and any five of the last six questions. Please do your best, and show all appropriate details in your solutions.
More informationPractice Midterm 1 Solutions Written by Victoria Kala July 10, 2017
Practice Midterm 1 Solutions Written by Victoria Kala July 10, 2017 1. Use the slope field plotter link in Gauchospace to check your solution. 2. (a) Not linear because of the y 2 sin x term (b) Not linear
More informationSample Questions, Exam 1 Math 244 Spring 2007
Sample Questions, Exam Math 244 Spring 2007 Remember, on the exam you may use a calculator, but NOT one that can perform symbolic manipulation (remembering derivative and integral formulas are a part of
More information8. Qualitative analysis of autonomous equations on the line/population dynamics models, phase line, and stability of equilibrium points (corresponds
c Dr Igor Zelenko, Spring 2017 1 8. Qualitative analysis of autonomous equations on the line/population dynamics models, phase line, and stability of equilibrium points (corresponds to section 2.5) 1.
More informationMATH 353 LECTURE NOTES: WEEK 1 FIRST ORDER ODES
MATH 353 LECTURE NOTES: WEEK 1 FIRST ORDER ODES J. WONG (FALL 2017) What did we cover this week? Basic definitions: DEs, linear operators, homogeneous (linear) ODEs. Solution techniques for some classes
More informationMath 266, Midterm Exam 1
Math 266, Midterm Exam 1 February 19th 2016 Name: Ground Rules: 1. Calculator is NOT allowed. 2. Show your work for every problem unless otherwise stated (partial credits are available). 3. You may use
More informationLECTURE 4-1 INTRODUCTION TO ORDINARY DIFFERENTIAL EQUATIONS
130 LECTURE 4-1 INTRODUCTION TO ORDINARY DIFFERENTIAL EQUATIONS DIFFERENTIAL EQUATIONS: A differential equation (DE) is an equation involving an unknown function and one or more of its derivatives. A differential
More informationMATH 294???? FINAL # 4 294UFQ4.tex Find the general solution y(x) of each of the following ODE's a) y 0 = cosecy
3.1. 1 ST ORDER ODES 1 3.1 1 st Order ODEs MATH 294???? FINAL # 4 294UFQ4.tex 3.1.1 Find the general solution y(x) of each of the following ODE's a) y 0 = cosecy MATH 294 FALL 1990 PRELIM 2 # 4 294FA90P2Q4.tex
More information8. Set up the integral to determine the force on the side of a fish tank that has a length of 4 ft and a heght of 2 ft if the tank is full.
. Determine the volume of the solid formed by rotating the region bounded by y = 2 and y = 2 for 2 about the -ais. 2. Determine the volume of the solid formed by rotating the region bounded by the -ais
More informationProblem Points Problem Points Problem Points
Name Signature Student ID# ------------------------------------------------------------------ Left Neighbor Right Neighbor 1) Please do not turn this page until instructed to do so. 2) Your name and signature
More informationHomework 2 Solutions Math 307 Summer 17
Homework 2 Solutions Math 307 Summer 17 July 8, 2017 Section 2.3 Problem 4. A tank with capacity of 500 gallons originally contains 200 gallons of water with 100 pounds of salt in solution. Water containing
More informationy0 = F (t0)+c implies C = y0 F (t0) Integral = area between curve and x-axis (where I.e., f(t)dt = F (b) F (a) wheref is any antiderivative 2.
Calulus pre-requisites you must know. Derivative = slope of tangent line = rate. Integral = area between curve and x-axis (where area can be negative). The Fundamental Theorem of Calculus: Suppose f continuous
More informationMath 23: Differential Equations (Winter 2017) Midterm Exam Solutions
Math 3: Differential Equations (Winter 017) Midterm Exam Solutions 1. [0 points] or FALSE? You do not need to justify your answer. (a) [3 points] Critical points or equilibrium points for a first order
More informationFirst Order ODEs, Part II
Craig J. Sutton craig.j.sutton@dartmouth.edu Department of Mathematics Dartmouth College Math 23 Differential Equations Winter 2013 Outline Existence & Uniqueness Theorems 1 Existence & Uniqueness Theorems
More informationOrdinary Differential Equations
Ordinary Differential Equations (MA102 Mathematics II) Shyamashree Upadhyay IIT Guwahati Shyamashree Upadhyay ( IIT Guwahati ) Ordinary Differential Equations 1 / 1 Books Shyamashree Upadhyay ( IIT Guwahati
More informationMath 225 Differential Equations Notes Chapter 1
Math 225 Differential Equations Notes Chapter 1 Michael Muscedere September 9, 2004 1 Introduction 1.1 Background In science and engineering models are used to describe physical phenomena. Often these
More informationMATH 307 Introduction to Differential Equations Autumn 2017 Midterm Exam Monday November
MATH 307 Introduction to Differential Equations Autumn 2017 Midterm Exam Monday November 6 2017 Name: Student ID Number: I understand it is against the rules to cheat or engage in other academic misconduct
More informationIt is convenient to think that solutions of differential equations consist of a family of functions (just like indefinite integrals ).
Section 1.1 Direction Fields Key Terms/Ideas: Mathematical model Geometric behavior of solutions without solving the model using calculus Graphical description using direction fields Equilibrium solution
More informationLecture 42 Determining Internal Node Values
Lecture 42 Determining Internal Node Values As seen in the previous section, a finite element solution of a boundary value problem boils down to finding the best values of the constants {C j } n, which
More informationAP Calculus BC Fall Final Part IIa
AP Calculus BC 18-19 Fall Final Part IIa Calculator Required Name: 1. At time t = 0, there are 120 gallons of oil in a tank. During the time interval 0 t 10 hours, oil flows into the tank at a rate of
More informationMA 102 Mathematics II Lecture Feb, 2015
MA 102 Mathematics II Lecture 1 20 Feb, 2015 Differential Equations An equation containing derivatives is called a differential equation. The origin of differential equations Many of the laws of nature
More informationPractice Final Exam Solutions
Important Notice: To prepare for the final exam, one should study the past exams and practice midterms (and homeworks, quizzes, and worksheets), not just this practice final. A topic not being on the practice
More informationVector Fields and Solutions to Ordinary Differential Equations using MATLAB/Octave
Vector Fields and Solutions to Ordinary Differential Equations using MATLAB/Octave Andreas Stahel 5th December 27 Contents Vector field for the logistic equation 2 Solutions of ordinary differential equations
More informationMATH 251 Examination I October 10, 2013 FORM A. Name: Student Number: Section:
MATH 251 Examination I October 10, 2013 FORM A Name: Student Number: Section: This exam has 13 questions for a total of 100 points. Show all you your work! In order to obtain full credit for partial credit
More informationOld Math 330 Exams. David M. McClendon. Department of Mathematics Ferris State University
Old Math 330 Exams David M. McClendon Department of Mathematics Ferris State University Last updated to include exams from Fall 07 Contents Contents General information about these exams 3 Exams from Fall
More informationBoyce/DiPrima/Meade 11 th ed, Ch 1.1: Basic Mathematical Models; Direction Fields
Boyce/DiPrima/Meade 11 th ed, Ch 1.1: Basic Mathematical Models; Direction Fields Elementary Differential Equations and Boundary Value Problems, 11 th edition, by William E. Boyce, Richard C. DiPrima,
More informationz x = f x (x, y, a, b), z y = f y (x, y, a, b). F(x, y, z, z x, z y ) = 0. This is a PDE for the unknown function of two independent variables.
Chapter 2 First order PDE 2.1 How and Why First order PDE appear? 2.1.1 Physical origins Conservation laws form one of the two fundamental parts of any mathematical model of Continuum Mechanics. These
More informationMath 266: Ordinary Differential Equations
Math 266: Ordinary Differential Equations Long Jin Purdue University, Spring 2018 Basic information Lectures: MWF 8:30-9:20(111)/9:30-10:20(121), UNIV 103 Instructor: Long Jin (long249@purdue.edu) Office
More informationThe integrating factor method (Sect. 1.1)
The integrating factor method (Sect. 1.1) Overview of differential equations. Linear Ordinary Differential Equations. The integrating factor method. Constant coefficients. The Initial Value Problem. Overview
More informationMath 216 First Midterm 18 October, 2018
Math 16 First Midterm 18 October, 018 This sample exam is provided to serve as one component of your studying for this exam in this course. Please note that it is not guaranteed to cover the material that
More informationMath 308 Exam I Practice Problems
Math 308 Exam I Practice Problems This review should not be used as your sole source for preparation for the exam. You should also re-work all examples given in lecture and all suggested homework problems..
More informationWe begin exploring Euler s method by looking at direction fields. Consider the direction field below.
Emma Reid- MA 66, Lesson 9 (SU 17) Euler s Method (.7) So far in this course, we have seen some very special types of first order ODEs. We ve seen methods to solve linear, separable, homogeneous, Bernoulli,
More informationMATH20411 PDEs and Vector Calculus B
MATH2411 PDEs and Vector Calculus B Dr Stefan Güttel Acknowledgement The lecture notes and other course materials are based on notes provided by Dr Catherine Powell. SECTION 1: Introctory Material MATH2411
More informationMATH 251 Examination I October 5, 2017 FORM A. Name: Student Number: Section:
MATH 251 Examination I October 5, 2017 FORM A Name: Student Number: Section: This exam has 13 questions for a total of 100 points. Show all your work! In order to obtain full credit for partial credit
More informationAMS 27L LAB #6 Winter 2009
AMS 27L LAB #6 Winter 2009 Symbolically Solving Differential Equations Objectives: 1. To learn about the MATLAB Symbolic Solver 2. To expand knowledge of solutions to Diff-EQs 1 Symbolically Solving Differential
More informationAPPLICATIONS OF FD APPROXIMATIONS FOR SOLVING ORDINARY DIFFERENTIAL EQUATIONS
LECTURE 10 APPLICATIONS OF FD APPROXIMATIONS FOR SOLVING ORDINARY DIFFERENTIAL EQUATIONS Ordinary Differential Equations Initial Value Problems For Initial Value problems (IVP s), conditions are specified
More informationPractice Final Exam Solutions
Important Notice: To prepare for the final exam, study past exams and practice exams, and homeworks, quizzes, and worksheets, not just this practice final. A topic not being on the practice final does
More informationMath 308 Exam I Practice Problems
Math 308 Exam I Practice Problems This review should not be used as your sole source of preparation for the exam. You should also re-work all examples given in lecture and all suggested homework problems..
More informationSolving systems of first order equations with ode Systems of first order differential equations.
A M S 20 MA TLA B NO T E S U C S C Solving systems of first order equations with ode45 c 2015, Yonatan Katznelson The M A T L A B numerical solver, ode45 is designed to work with first order differential
More informationModeling using ODEs: Mixing Tank Problem. Natasha Sharma, Ph.D.
Reference W. Boyce and R. DiPrima, Elementary Differential Equations and Boundary Value s 8th Edition, John Wiley and Sons, 2005. First-Order Ordinary Differential Equation Definition (First Order Ordinary
More informationMATH 251 Examination I July 1, 2013 FORM A. Name: Student Number: Section:
MATH 251 Examination I July 1, 2013 FORM A Name: Student Number: Section: This exam has 12 questions for a total of 100 points. Show all your work! In order to obtain full credit for partial credit problems,
More informationLecture Notes for Math 251: ODE and PDE. Lecture 7: 2.4 Differences Between Linear and Nonlinear Equations
Lecture Notes for Math 51: ODE and PDE. Lecture 7:.4 Differences Between Linear and Nonlinear Equations Shawn D. Ryan Spring 01 1 Existence and Uniqueness Last Time: We developed 1st Order ODE models for
More informationName: October 24, 2014 ID Number: Fall Midterm I. Number Total Points Points Obtained Total 40
Math 307O: Introduction to Differential Equations Name: October 24, 204 ID Number: Fall 204 Midterm I Number Total Points Points Obtained 0 2 0 3 0 4 0 Total 40 Instructions.. Show all your work and box
More informationChapter 2: First Order DE 2.4 Linear vs. Nonlinear DEs
Chapter 2: First Order DE 2.4 Linear vs. Nonlinear DEs First Order DE 2.4 Linear vs. Nonlinear DE We recall the general form of the First Oreder DEs (FODE): dy = f(t, y) (1) dt where f(t, y) is a function
More informationMAT01B1: Separable Differential Equations
MAT01B1: Separable Differential Equations Dr Craig 3 October 2018 My details: acraig@uj.ac.za Consulting hours: Tomorrow 14h40 15h25 Friday 11h20 12h55 Office C-Ring 508 https://andrewcraigmaths.wordpress.com/
More informationSMA 208: Ordinary differential equations I
SMA 208: Ordinary differential equations I First Order differential equations Lecturer: Dr. Philip Ngare (Contacts: pngare@uonbi.ac.ke, Tue 12-2 PM) School of Mathematics, University of Nairobi Feb 26,
More informationMath 310 Introduction to Ordinary Differential Equations Final Examination August 9, Instructor: John Stockie
Make sure this exam has 15 pages. Math 310 Introduction to Ordinary Differential Equations inal Examination August 9, 2006 Instructor: John Stockie Name: (Please Print) Student Number: Special Instructions
More informationMath 106 Answers to Exam 3a Fall 2015
Math 6 Answers to Exam 3a Fall 5.. Consider the curve given parametrically by x(t) = cos(t), y(t) = (t 3 ) 3, for t from π to π. (a) (6 points) Find all the points (x, y) where the graph has either a vertical
More informationy=5 y=1+x 2 AP Calculus Chapter 5 Testbank Part I. Multiple-Choice Questions
AP Calculus Chapter 5 Testbank Part I. Multiple-Choice Questions. Which of the following integrals correctly corresponds to the area of the shaded region in the figure to the right? (A) (B) (C) (D) (E)
More informationSolution. It is evaluating the definite integral r 1 + r 4 dr. where you can replace r by any other variable.
Solutions of Sample Problems for First In-Class Exam Math 246, Fall 202, Professor David Levermore () (a) Give the integral being evaluated by the following MATLAB command. int( x/(+xˆ4), x,0,inf) Solution.
More informationAPPM 2360: Midterm exam 1 February 15, 2017
APPM 36: Midterm exam 1 February 15, 17 On the front of your Bluebook write: (1) your name, () your instructor s name, (3) your recitation section number and () a grading table. Text books, class notes,
More informationSolutions to the Review Questions
Solutions to the Review Questions Short Answer/True or False. True or False, and explain: (a) If y = y + 2t, then 0 = y + 2t is an equilibrium solution. False: (a) Equilibrium solutions are only defined
More informationy=5 y=1+x 2 AP Calculus Chapter 5 Testbank Part I. Multiple-Choice Questions
AP Calculus Chapter 5 Testbank Part I. Multiple-Choice Questions. Which of the following integrals correctly corresponds to the area of the shaded region in the figure to the right? (A) (B) (C) (D) (E)
More informationANOTHER FIVE QUESTIONS:
No peaking!!!!! See if you can do the following: f 5 tan 6 sin 7 cos 8 sin 9 cos 5 e e ln ln @ @ Epress sin Power Series Epansion: d as a Power Series: Estimate sin Estimate MACLAURIN SERIES ANOTHER FIVE
More informationQualitative analysis of differential equations: Part I
Qualitative analysis of differential equations: Part I Math 12 Section 16 November 7, 216 Hi, I m Kelly. Cole is away. Office hours are cancelled. Cole is available by email: zmurchok@math.ubc.ca. Today...
More informationChapter1. Ordinary Differential Equations
Chapter1. Ordinary Differential Equations In the sciences and engineering, mathematical models are developed to aid in the understanding of physical phenomena. These models often yield an equation that
More informationLecture 2. Classification of Differential Equations and Method of Integrating Factors
Math 245 - Mathematics of Physics and Engineering I Lecture 2. Classification of Differential Equations and Method of Integrating Factors January 11, 2012 Konstantin Zuev (USC) Math 245, Lecture 2 January
More informationINTRODUCTION TO PDEs
INTRODUCTION TO PDEs In this course we are interested in the numerical approximation of PDEs using finite difference methods (FDM). We will use some simple prototype boundary value problems (BVP) and initial
More informationMath 217 Practice Exam 1. Page Which of the following differential equations is exact?
Page 1 1. Which of the following differential equations is exact? (a) (3x x 3 )dx + (3x 3x 2 ) d = 0 (b) sin(x) dx + cos(x) d = 0 (c) x 2 x 2 = 0 (d) (1 + e x ) + (2 + xe x ) d = 0 CORRECT dx (e) e x dx
More informationLectures in Differential Equations
Lectures in Differential Equations David M. McClendon Department of Mathematics Ferris State University last revised December 2016 1 Contents Contents 2 1 First-order linear equations 4 1.1 What is a differential
More informationSolutions to the Review Questions
Solutions to the Review Questions Short Answer/True or False. True or False, and explain: (a) If y = y + 2t, then 0 = y + 2t is an equilibrium solution. False: This is an isocline associated with a slope
More informationBessel s Equation. MATH 365 Ordinary Differential Equations. J. Robert Buchanan. Fall Department of Mathematics
Bessel s Equation MATH 365 Ordinary Differential Equations J. Robert Buchanan Department of Mathematics Fall 2018 Background Bessel s equation of order ν has the form where ν is a constant. x 2 y + xy
More informationMATH 220: Problem Set 3 Solutions
MATH 220: Problem Set 3 Solutions Problem 1. Let ψ C() be given by: 0, x < 1, 1 + x, 1 < x < 0, ψ(x) = 1 x, 0 < x < 1, 0, x > 1, so that it verifies ψ 0, ψ(x) = 0 if x 1 and ψ(x)dx = 1. Consider (ψ j )
More informationẋ = f(x, y), ẏ = g(x, y), (x, y) D, can only have periodic solutions if (f,g) changes sign in D or if (f,g)=0in D.
4 Periodic Solutions We have shown that in the case of an autonomous equation the periodic solutions correspond with closed orbits in phase-space. Autonomous two-dimensional systems with phase-space R
More informationOrdinary Differential Equations I
Ordinary Differential Equations I CS 205A: Mathematical Methods for Robotics, Vision, and Graphics Justin Solomon CS 205A: Mathematical Methods Ordinary Differential Equations I 1 / 27 Theme of Last Three
More informationNumerical method for approximating the solution of an IVP. Euler Algorithm (the simplest approximation method)
Section 2.7 Euler s Method (Computer Approximation) Key Terms/ Ideas: Numerical method for approximating the solution of an IVP Linear Approximation; Tangent Line Euler Algorithm (the simplest approximation
More informationMAT 311 Midterm #1 Show your work! 1. The existence and uniqueness theorem says that, given a point (x 0, y 0 ) the ODE. y = (1 x 2 y 2 ) 1/3
MAT 3 Midterm # Show your work!. The existence and uniqueness theorem says that, given a point (x 0, y 0 ) the ODE y = ( x 2 y 2 ) /3 has a unique (local) solution with initial condition y(x 0 ) = y 0
More informationExam 2 Solutions, Math March 17, ) = 1 2
Eam Solutions, Math 56 March 7, 6. Use the trapezoidal rule with n = 3 to approimate (Note: The eact value of the integral is ln 5 +. (you do not need to verify this or use it in any way to complete this
More informationMath 210 Differential Equations Mock Final Dec *************************************************************** 1. Initial Value Problems
Math 210 Differential Equations Mock Final Dec. 2003 *************************************************************** 1. Initial Value Problems 1. Construct the explicit solution for the following initial
More informationMATH 251 Examination I July 5, 2011 FORM A. Name: Student Number: Section:
MATH 251 Examination I July 5, 2011 FORM A Name: Student Number: Section: This exam has 12 questions for a total of 100 points. Show all you your work! In order to obtain full credit for partial credit
More informationFirst and Second Order Differential Equations Lecture 4
First and Second Order Differential Equations Lecture 4 Dibyajyoti Deb 4.1. Outline of Lecture The Existence and the Uniqueness Theorem Homogeneous Equations with Constant Coefficients 4.2. The Existence
More informationPractice problems from old exams for math 132 William H. Meeks III
Practice problems from old exams for math 32 William H. Meeks III Disclaimer: Your instructor covers far more materials that we can possibly fit into a four/five questions exams. These practice tests are
More informationMathematical Models. MATH 365 Ordinary Differential Equations. J. Robert Buchanan. Spring Department of Mathematics
Mathematical Models MATH 365 Ordinary Differential Equations J. Robert Buchanan Department of Mathematics Spring 2018 Ordinary Differential Equations The topic of ordinary differential equations (ODEs)
More informationMath 2410Q - 10 Elementary Differential Equations Summer 2017 Midterm Exam Review Guide
Math 410Q - 10 Elementary Differential Equations Summer 017 Mierm Exam Review Guide Math 410Q Mierm Exam Info: Covers Sections 1.1 3.3 7 questions in total Some questions will have multiple parts. 1 of
More informationProblem set 7 Math 207A, Fall 2011 Solutions
Problem set 7 Math 207A, Fall 2011 s 1. Classify the equilibrium (x, y) = (0, 0) of the system x t = x, y t = y + x 2. Is the equilibrium hyperbolic? Find an equation for the trajectories in (x, y)- phase
More information3.3. SYSTEMS OF ODES 1. y 0 " 2y" y 0 + 2y = x1. x2 x3. x = y(t) = c 1 e t + c 2 e t + c 3 e 2t. _x = A x + f; x(0) = x 0.
.. SYSTEMS OF ODES. Systems of ODEs MATH 94 FALL 98 PRELIM # 94FA8PQ.tex.. a) Convert the third order dierential equation into a rst oder system _x = A x, with y " y" y + y = x = @ x x x b) The equation
More informationComputational Neuroscience. Session 1-2
Computational Neuroscience. Session 1-2 Dr. Marco A Roque Sol 05/29/2018 Definitions Differential Equations A differential equation is any equation which contains derivatives, either ordinary or partial
More information