Let X : = Πα∈IXα be a product space (with the product topology), πα : X → Xα be the projection map for each α∈I, and {xn} be a sequence in X. Prove that the sequence {xn} converges to a point x∈X if and only if {πα(xn)} converges to πα(x) for every α∈I.
Let X : = Πα∈IXα be a product space (with the product topology), πα : X...
Let be a metric space and let be the topology on induced by , and let be a compact space. Prove that is compact. (x, d) We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this imageAj,i=1,2,... na1 An
Let be the real line with Euclidean topology. Prove that every connected subset of is an interval. We were unable to transcribe this imageWe were unable to transcribe this image
Let V be a Hilbert space. Let S1 and S2 be two hyperplanes in V defined by Let be given. We consider the projection of y onto , i.e., the solution of (1) (a) Prove that is a plane, i.e., if , then for any . (b) Prove that z is a solution of (1) if and only if and (2) (c) Find an explicit solution of (1). ( d) Prove the solution found in part (c) is unique. We...
Let be an inner product space (over or ), and . Prove that is an eigenvalue of if and only if (the conjugate of ) is an eigenvalue of (the adjoint of ). We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this imageTEL(V) We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to...
Let be a sequence of random variables, and let Y be a random variable on the same sample space. Let An(ϵ) be the event that |Yn − Y | > ϵ. It can be shown that a sufficient condition for Yn to converge to Y w.p.1 as n → ∞ is that for every ϵ > 0, (a) Let be independent uniformly distributed random variables on [0, 1], and let Yn = min(X1, . . . , Xn). In class,...
A function from N to a space X is a sequence n-xn in X. A sequence in a topological space converges to a point x E X if for each open neighborhood U of x there exists a є N such that Tn E U for all n 2 N. c) Consider the (non-Hausdorff) space S1,2,3 equipped with the indiscrete topology; that is, the only open sets are and S. Let n sn be an arbitrary sequence in S. Show...
Problem 1. Let (X, d) be a metric space and t the metric topology on X. (a) Fix a E X. Prove that the map f :(X, T) + R defined by f(x) = d(a, x) is continuous. (b) If {x'n} and {yn} are Cauchy sequences, prove that {d(In, Yn)} is a Cauchy sequence in R.
Let be an orthonormal set of a Hilbert space. Let and be two vectors in H. Show that converges absolutely, and that We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this image
Let V be a finite-dimensional vector space and let T L(V) be an operator. In this problem you show that there is a nonzero polynomial such that p(T) = 0. (a) What is 0 in this context? A polynomial? A linear map? An element of V? (b) Define by . Prove that is a linear map. (c) Prove that if where V is infinite-dimensional and W is finite-dimensional, then S cannot be injective. (d) Use the preceding parts to prove...
Let X and Y be a first countable spaces. Prove that f:XY is continuous if whenever xnx in X then f(xn )f(x) in Y We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to transcribe this image