Functions of Several Variables

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1 Functions of Several Variables Extreme Values Philippe B Laval KSU April 9, 2012 Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

2 Introduction In Calculus I (differential calculus for functions of one variable), the derivative was used successfully as a tool to find the maximum and minimum values of a function of one variable In this section, we apply a similar concept to functions of two variables The analogue of the derivative are the partials with respect to the variables of the function We will see that partial derivatives play a role similar to that of the derivative However, the situation is a little bit more complicated with functions of several variables In order to understand this section better, the reader may want to review how maximum and minimum values are found in the case of functions of one variable Goal: Given a function of two variables z = f (x, y), our goal is to find if it has local and global extreme values If it does, we want to find where (at which points) these extreme values occur and what they are We begin by giving more precise definitions of the concepts studied Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

3 Local Extreme Values: Definitions Definition Let f (x, y) be a function of two variables and (a, b) a point in the domain of f 1 f has a local maximum at (a, b) if f (x, y) f (a, b) for every point (x, y) near (a, b) The number f (a, b) is called a local maximum 2 If the above inequality holds for every point (x, y) in the domain of f, then f has an absolute maximum at (a, b) 3 f has a local minimum at (a, b) if f (x, y) f (a, b) for every point (x, y) near (a, b) The number f (a, b) is called a local minimum 4 If the above inequality holds for every point (x, y) in the domain of f, then f has an absolute minimum at (a, b) 5 As in the one variable case, the local maxima and minima together comprise the local extreme values The absolute maxima and minima together comprise the absolute extreme values Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

4 Local Extreme Values: Definitions and Theorems To understand and visualize these concepts better, it helps to think of the graph of a function as a terrain The local maxima are the peaks, the local minima are the valley bottoms As we did in calculus I, our approach is to find points which are candidates for local extreme values We then test them to see which one really correspond to local extreme values For functions of two variables, there is a theorem similar to Fermat s theorem Theorem Let f (x, y) be a function of two variables and (a, b) an interior point of the domain of f If f has a local extremum at (a, b) then either f (a, b) = 0 or f (a, b) does not exist Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

5 Local Extreme Values: Definitions and Theorems Remark: The theorem could have been stated differently Instead of saying f (a, b) = f (a, b) 0, we could have said = 0 and x f (a, b) = 0 because for a vector to be the zero vector, all its y components must be 0 You will also note that for f (a, b) not to exist, it is enough for one of its component not to exist that is one of the partials at (a, b) not to exist Remark: Geometrically, the theorem says that if f has a tangent plane at (a, b) and f has a local extremum at (a, b), then the tangent plane must be horizontal You will see that this is similar to the case of functions of one variable In the case of functions of one variable, Fermat s theorem says that if a function has a tangent line and an extremum at a point, then the tangent line must be horizontal at that point Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

6 Local Extreme Values: Definitions and Theorems Remark: Unfortunately, like in the one dimensional case, the reverse is not true A point (a, b) at which either f (a, b) = 0 or f (a, b) does not exist, does not necessarily correspond to an extreme value These points will simply be candidates We will need to test these candidates to see which ones correspond to extreme values Because such points play such an important role, we give them a special name Definition A point (a, b) is called a critical point of the function f (x, y) if the following conditions are satisfied: 1 (a, b) is an interior point of the domain of f 2 Either f (a, b) = 0 or f (a, b) does not exist Remark: The above theorem tells us that a local extreme value can only occur at a critical point However, not every critical point corresponds to an extreme value Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

7 Local Extreme Values: s Find the critical points of f (x, y) = x 2 + y 2 Find the critical points of f (x, y) = y 2 xy + 2x + y + 1 Find the critical points of f (x, y) = 1 + x 2 + y 2 Find the critical points of f (x, y) = x 3 Find the critical points of f (x, y) = x 2 y 2 Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

8 Local Extreme Values: Test We now state the equivalent of the second derivative test, for functions of two variables This test is a little bit more complex than the second derivative test and its proof far more complicated We will give the test without proof A proof can be found in most advanced calculus books Theorem Let f be a function of two variables and (a, b) an interior point of the domain of f Suppose that the second partials of f are continuous on a disk centered at (a, b) and f (a, b) = 0 (that is (a, b) is a critical point of f, also the graph of z = f (x, y) has a horizontal tangent plane at (a, b)) Let D = 2 f x 2 (a, b) 2 f y 2 (a, b) [ 2 f x y (a, b) ] 2 1 If D > 0 and 2 f x 2 (a, b) > 0, then f (a, b) is a local minimum 2 If D > 0 and 2 f x 2 (a, b) < 0, then f (a, b) is a local maximum 3 If D < 0, then f (a, b) is not a local maximum or minimum Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

9 Local Extreme Values: Test and s Remark: In the last case, when D < 0, (a, b) is called a saddle point Remark: If D = 0, the test provides no information Remark: To remember the formula for D, write it as the determinant 2 f 2 f D = x 2 2 f x y y x 2 f y 2 Find the local extreme values of f (x, y) = 2x 2 + y 2 xy 7y Find the local extreme values of f (x, y) = x 3 + y 3 3xy Find the local extreme values of f (x, y) = xye x2 +y2 2 Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

10 Global or Absolute Extreme Values: Definitions and Theorems For functions of one variable, the Extreme Value Theorem says that if such functions are continuous on a closed interval, then they have an absolute maximum and minimum on that interval These absolute extrema can occur at a critical point but also at the endpoints of the interval This result can be extended to functions of two or more variables In the case of functions of two variables, the term end point of the interval will be replaced by boundary of the set Theorem If f is continuous on a closed and bounded set D in R 2, then f has both an absolute maximum and a minimum on D That is there exists points (a, b) and (c, d) in D such that f (a, b) is an absolute maximum and f (c, d) is an absolute minimum Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

11 Global or Absolute Extreme Values: Theorem Absolute extrema can happen at critical points of f in D They can also happen on the boundary of D Unfortunately, finding the extreme values of f on the boundary is in general difficult and requires special methods we will not cover We can do it in very simple cases as the next example illustrates First, let us summarize the steps to follow in order to find the global extrema of a function f on a closed and bounded set D Theorem To find the global extrema of a continuous function f on a closed and bounded set D : 1 Find the critical points of f and the values of f at these critical points 2 Find the extreme values of f on the boundary of D 3 The largest value from steps 1 and 2 is the absolute maximum, the smallest is the absolute minimum Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

12 Global or Absolute Extreme Values: s Find the absolute extrema of f (x, y) = x 2 2xy + 2y on D where D = {(x, y) 0 x 3 and 0 y 2} Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

13 Exercises See the problems at the end of section 37 in my notes on extreme values Philippe B Laval (KSU) Functions of Several Variables April 9, / 13

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