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Unformatted text preview: B U Department of Mathematics Spring 2006 Math 332  Real Analysis II, Second Midterm, 22/5/2006, 17:0019:30 Whatever theorem, proposition, lemma you use, Full Name : you must be sure that it is applicable. Student ID : Justify all your claims in your proofs. over 40 1. [8] What does a mathematician mean exactly when he/she says: A function f : R m R n is not interesting away from its critical points. Here we might have m n or n m . Solution: A critical point for an Rvalued function is a point where the derivative map is zero, i.e. the rank of the matrix of the derivative map is not full rank. Make the same definition for a function f : R m R n . Let m = n . Then by Inverse Function Theorem, f is nothing but a local coordinate change; i.e. up to a local coordinate change, f is the identity map. Is it interesting? Not much. If m n , then by Domain Straightening Theorem f turns out to be just a projection up to a local coordinate change. If m n , then by Range Straightening Theorem f turns out to be just an insertion up to a local coordinate change. Hence, away from critical points, maps are either identity,to be just an insertion up to a local coordinate change....
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This note was uploaded on 05/04/2011 for the course MATH 321 taught by Professor Talinbudak during the Spring '11 term at BU.
 Spring '11
 talinbudak

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