MATH 411 Final: MATH411 BOYLE-M SPRING2012 0101 FINAL EXAM

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15 Feb 2019
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Math 411 spring 2012 boyle final exam. Points in rn are column vectors (even if they are typed horizontally): (a) (15 pts. ) De ne what it means for f to be di erentiable. (b) (30 pts. ) Suppose f : rn r all partial derivatives are continuous functions. Prove that f is di erentiable. (c) (15 pts. ) A function f : rn rm is di erentiable if and only if each of its real-valued component functions f1, f2, . Suppose that k and f are nonempty closed subsets of rn, k is bounded and f k = . De ne f : u r2 by the rule f (x, y) = (xey, 1+x ln(y)), and de ne g : u r by the rule g(x, y) = x2 +y ln(x). (a) (20 pts. ) Prove there is an open set v containing the point (e, 1) and a di erentiable function h : v r such that on the set f 1(v),

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