Suppose M and N are C manifolds, U an is C. Show that there exists a neighborhoo that F can be extended to a C mapping F for all q e V.
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- 27. Let , where and are nonempty. Prove that has the property that for every subset of if and only if is one-to-one. (Compare with Exercise 15 b.). 15. b. For the mapping , show that if , then .Consider the mapping :Z[ x ]Zk[ x ] defined by (a0+a1x++anxn)=[ a0 ]+[ a1 ]x++[ an ]xn, where [ ai ] denotes the congruence class of Zk that contains ai. Prove that is an epimorphism from Z[ x ] to Zk[ x ].If x and y are elements of an ordered integral domain D, prove the following inequalities. a. x22xy+y20 b. x2+y2xy c. x2+y2xy
- [Type here] 21. Prove that ifand are integral domains, then the direct sum is not an integral domain. [Type here]The main point of this exercise is to use Green’s Theorem to deduce a specialcase of the change of variable formula. Let U, V ⊆ R2 be path connected open sets and letG : U → V be one-to-one and C2such that the derivate DG(u) is invertible for all u ∈ U.Let T ⊆ U be a regular region with piecewise smooth boundary, and let S = G(T). Answer CSuppose that we define a function d that maps R2 to R by d(x,y) = { 0,. if x = y 1, if x is not equal to y }. a. Prove that d is a metric on R. b. Prove that for any a in R, {a} is an open set under the metric d. c. Let X = R with the usual Euclidean distance and Y = R with the metric d defined above. Prove that f maps X to Y defined by f(x) = x is not continuous.
- Let F be a nonempty set of functions that map [0, 1] into [0, 1] . For all f and g in F, define d(f, g) = sup{|f(x)-g(x)|: x in [0,1]}. Show that d is a metric on f.Consider the Cauchy Problem y 0 = a(x) arctan y, y(0) = 1, where a(x) is a continuous function defined on R, such that for every x it holds that |a(x)| ≤ 1. Using the Global Picard–Lindel¨of Theorem, show that there exists a unique solution y defined on R.The main point of this exercise is to use Green’s Theorem to deduce a specialcase of the change of variable formula. Let U, V ⊆ R2 be path connected open sets and letG : U → V be one-to-one and C2such that the derivate DG(u) is invertible for all u ∈ U.Let T ⊆ U be a regular region with piecewise smooth boundary, and let S = G(T). Solve A B C