DIFFERENTIAL EQUATIONS
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1 DIFFERENTIAL EQUATIONS 1. Basic Terminology A differential equation is an equation that contains an unknown function together with one or more of its derivatives. 1
2 Examples: 1. y = 2x + cos x 2. dy dt = ky (exponential growth/decay) 3. x 2 y 2xy + 2y = 4x 3 2
3 4. 2 u x u = 0 (Laplace s eqn.) y2 5. d 3 y dx 3 4d2 y dx 2 + 4dy dx = 0 3
4 TYPE: If the unknown function depends on a single independent variable, then the equation is an ordinary differential equation (ODE). If the unknown function depends on more than one independent variable, then the equation is a partial differential equation (PDE). 4
5 ORDER: The order of a differential equation is the order of the highest derivative of the unknown function appearing in the equation. 5
6 Examples: 1. y = 2x + cos x 2. dy dt = ky (exponential growth/decay) 3. x 2 y 2xy + 2y = 4x 3 6
7 4. 2 u x u = 0 (Laplace s eqn.) y2 5. d 3 y dx 3 y 4d2 dx 2 + 4dy dx = 0 6. d 2 y dx2+2x sin ( dy dx )+3e xy = d3 dx 3(e2x ) 7
8 SOLUTION: A solution of a differential equation is a function defined on some domain D such that the equation reduces to an identity when the function is substituted into the equation. 8
9 Examples: 1. y = 2x + cos x 9
10 2. y = 3y 10
11 3. y 2y 8y = 4e 2x Is y = 2e 4x 1 2 e2x a solution? 11
12 y 2y 8y = 4e 2x Is y = e 2x + 2e 3x a solution? 12
13 4. x 2 y 4xy + 6y = 3x 4 Is y = 3 2 x4 + 2x 3 a solution? 13
14 x 2 y 2xy + 2y = 4x 3 Is y = 2x 2 + x 3 a solution? 14
15 5. 2 u x u y 2 = 0 u = ln x 2 + y 2 Solution? 15
16 2 u x u y 2 = 0 u = cos x sinh y, u = 3x 4y Solutions?? 16
17 6. Find a value of r, if possible, such that y = e rx is a solution of y 3y 10y = 0. 17
18 7. Find a value of r, if possible, such that y = x r is a solution of x 2 y 4x y + 6y = 0. 18
19 8. Find a value of r, if possible, such that y = x r is a solution of y 1 x y 3 x 2 y = 0. 19
20 From now on, all differential equations are ordinary differential equations. 20
21 2. n-parameter FAMILY OF SOLUTIONS / GENERAL SOLU- TION Example: Solve the differential equation: y 12x + 6e 2x = 0 21
22 NOTE: To solve a differential equation having the special form y (n) (x) = f(x), simply integrate f n times, and EACH integration step produces an arbitrary constant. 22
23 Intuitively, to find a set of solutions of an n-th order differential equation F [ x, y, y, y,..., y (n)] = 0 we integrate n times, with each integration step producing an arbitrary constant of integration (i.e., a parameter). Thus, in theory, an n-th order differential equation has an n-parameter family of solutions. 23
24 SOLVING A DIFFERENTIAL EQUA- TION: To solve an n-th order differential equation F ( x, y, y, y,..., y (n)) = 0 means to find an n-parameter family of solutions. (Note: Same n.) NOTE: An n-parameter family of solutions is more commonly called the GENERAL SOLUTION. 24
25 Examples: Find the general solution: 1. y 3x 2 2x + 4 = 0 25
26 y = x 3 + x 2 4x + C y x
27 2. y + 2sin 2x = 0 27
28 y = 1 2 sin2x + C 1x + C 2 y x
29 3. y 3y + 3y y = 0 Answer: y = C 1 e x + C 2 xe x + C 3 x 2 e x 4. x 2 y 4xy + 6y = 3x 4 Answer: y = C 1 x 2 + C 2 x x4 29
30 PARTICULAR SOLUTION: If specific values are assigned to the arbitrary constants in the general solution of a differential equation, then the resulting solution is called a particular solution of the equation. 30
31 Examples: 1. y = 6x + 8e 2x General solution: y = x 3 + 2e 2x + C 1 x + C 2 Particular solutions: 31
32 2. x 2 y 2xy + 2y = 4x 3 General solution: y = C 1 x + C 2 x 2 + 2x 3 Particular solutions: 32
33 3. THE DIFFERENTIAL EQUA- TION OF AN n-parameter FAM- ILY: Given an n-parameter family of curves. The differential equation of the family is an n-th order differential equation that has the given family as its general solution. 33
34 Examples: 1. y 2 = Cx is the general solution of a DE. a. What is the order of the DE? b. Find the DE? 34
35
36 2. y = C 1 x + C 2 x 3 is the general solution of a DE. a. What is the order of the DE? b. Find the DE? 35
37
38 General strategy for finding the differential equation Step 1. Differentiate the family n times. This produces a system of n+1 equations. Step 2. Choose any n of the equations and solve for the parameters. Step 3. Substitute the values for the parameters in the remaining equation. 36
39 Examples: The given family of functions is the general solution of a differential equation. (a) What is the order of the equation? (b) Find the equation. 37
40 1. y = Cx 3 2x (a) (b) 38
41 2. y = C 1 e 2x + C 2 e 3x (a) (b) 39
42 3. y = C 1 cos 3x + C 2 sin 3x (a) (b) 40
43 4. y = C 1 x 4 + C 2 x + C 3 (a) (b) 41
44 5. y = C 1 + C 2 x + C 3 x 2 (a) (b) 42
45 4. INITIAL-VALUE PROBLEMS: 1. Find a solution of y = 3x 2 + 2x + 1 which passes through the point ( 2, 4). 43
46 General solution: y = x 3 + x 2 + x + C y x
47 y = x 3 + x 2 + x + 10 y x
48 2. y = C 1 cos 3x + C 2 sin 3x is the general solution of y + 9y = 0. a. Find a solution which satisfies y(0) = 3 46
49 b. Find a solution which satisfies y(0) = 4, y(π) = 4 47
50 c. Find a solution which satisfies y(0) = 3, y (0) = 4 48
51 An n-th order initial-value problem consists of an n-th order differential equation F [ x, y, y, y,..., y (n)] = 0 together with n (initial) conditions of the form y(c) = k 0, y (c) = k 1, y (c) = k 2,..., y (n 1) (c) = k n 1 where c and k 0, k 1,..., k n 1 are given numbers. 49
52 NOTES: 1. An n-th order differential equation can always be written in the form F [ x, y, y, y,, y (n)] = 0 by bringing all the terms to the lefthand side of the equation. 2. The initial conditions determine a particular solution of the differential equation. 50
53 Strategy for Solving an Initial-Value Problem: Step 1. Find the general solution of the differential equation. Step 2. Use the initial conditions to solve for the arbitrary constants in the general solution. 51
54 Examples: 1. Find a solution of the initial-value problem y = 4x + 6e 2x, y(0) = 5 52
55 2. y = C 1 e 2x + C 2 e 4x is the general solution of y 2y 8y = 0 Find a solution that satisfies the initial conditions y(0) = 3, y (0) = 2 53
56
57 3. y = C 1 x + C 2 x 3 is the general solution of y 3 x y + 3 x 2 y = 0 a. Find a solution which satisfies y(1) = 2, y (1) = 4. 54
58 b. Find a solution which satisfies y(0) = 0, y (0) = 2. c. Find a solution which satisfies y(0) = 4, y (0) = 3. 55
59 EXISTENCE AND UNIQUENESS: The fundamental questions in a course on differential equations are: 1. Does a given initial-value problem have a solution? That is, do solutions to the problem exist? 2. If a solution does exist, is it unique? That is, is there exactly one solution to the problem, or is there more than one solution? 56
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