Let 
be a metric space and let 
be the topology on 
induced by 
, and let 
be a compact space. Prove that 
is compact.
Homework Answers
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Let
be a metric space and let
be the topology on
induced by
, and let...
6 6. Let (X, d) be a metric space and T the topology induced on X by d. Let Y be a subset of X and di the metric on Y obtained by restricting d; that is, di(a, b) d(a, b) for all a and b in Y. If...
6
6. Let (X, d) be a metric space and T the topology induced on X by d. Let Y be a subset of X and di the metric on Y obtained by restricting d; that is, di(a, b) d(a, b) for all a and b in Y. If T1 is the topology induced orn Y by di and T2 is the subspace topology on Y (induced by T on X), prove that Ti -T2. [This shows that every subspace...
Let X : = Πα∈IXα be a product space (with the product topology), πα : X...
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.
We were unable to transcribe this imageX n=1
Problem 1. Let (X, d) be a metric space and t the metric topology on X....
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.
A metric space (X, d) is totally bounded if, given ε>0, there exists a finite subset...
A metric space (X, d) is totally bounded if, given
ε>0, there exists a finite subset =
of X, called an ε-net, such that for each x∈X there
exists
∈
such that d(x,)
< ε. Prove that if Y is a subset of a totally bounded space X
then, given ε>0, the subset Y has an ε-net and
therefore Y is also totally bounded.
We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to...
(TOPOLOGY) Prove the following using the defintion: Exercise 56. Let (M, d) be a metric space...
(TOPOLOGY) Prove the following using the defintion:
Exercise 56. Let (M, d) be a metric space and let k be a positive real number. We have shown that the function dk defined by dx(x, y) = kd(x,y) is a metric on M. Let Me denote M with metric d and let M denote M with metric dk. 1. Let f: Md+Mk be defined by f(x) = r. Show that f is continuous. 2. Let g: Mx + Md be defined...
Let be the real line with Euclidean topology. Prove that every connected subset of is 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 con...
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...
1. Let (X, d) be a metric space, and U, V, W CX subsets of X....
1. Let (X, d) be a metric space, and U, V, W CX subsets of X. (a) (i) Define what it means for U to be open. (ii) Define what it means for V to be closed. (iii) Define what it means for W to be compact. (b) Prove that in a metric space a compact subset is closed.
Let (Mi,p) be the metric space introduced in the last homework set. That is, M is the set of all ...
Let (Mi,p) be the metric space introduced in the last homework set. That is, M is the set of all real sequences {aife1 such that Σ i ai converges. The metric P1 is defined by setting, for each pair of elements {aiだ1 and {biだ1 in My ai- b i-1 We were unable to transcribe this image
Let (Mi,p) be the metric space introduced in the last homework set. That is, M is the set of all real sequences {aife1 such...
Topology 3. Either prove or disprove each of the following statements: (a) If d and p...
Topology
3. Either prove or disprove each of the following statements: (a) If d and p map (X, d) X, then the identity topologically equivalent metrics (X, p) and its inverse are both continuous are two on (b) Any totally bounded metric space is compact. (c) The open interval (-r/2, n/2) is homeomorphic to R (d) If X and Y are homeomorphic metric spaces, then X is complete if and only if Y is complete (e) Let X and Y...
6
6. Let (X, d) be a metric space and T the topology induced on X by d. Let Y be a subset of X and di the metric on Y obtained by restricting d; that is, di(a, b) d(a, b) for all a and b in Y. If T1 is the topology induced orn Y by di and T2 is the subspace topology on Y (induced by T on X), prove that Ti -T2. [This shows that every subspace...
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.
We were unable to transcribe this imageX n=1
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.
A metric space (X, d) is totally bounded if, given
ε>0, there exists a finite subset =
of X, called an ε-net, such that for each x∈X there
exists
∈
such that d(x,)
< ε. Prove that if Y is a subset of a totally bounded space X
then, given ε>0, the subset Y has an ε-net and
therefore Y is also totally bounded.
We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable to...
(TOPOLOGY) Prove the following using the defintion:
Exercise 56. Let (M, d) be a metric space and let k be a positive real number. We have shown that the function dk defined by dx(x, y) = kd(x,y) is a metric on M. Let Me denote M with metric d and let M denote M with metric dk. 1. Let f: Md+Mk be defined by f(x) = r. Show that f is continuous. 2. Let g: Mx + Md be defined...
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
1. Let (X, d) be a metric space, and U, V, W CX subsets of X. (a) (i) Define what it means for U to be open. (ii) Define what it means for V to be closed. (iii) Define what it means for W to be compact. (b) Prove that in a metric space a compact subset is closed.
Let (Mi,p) be the metric space introduced in the last homework set. That is, M is the set of all real sequences {aife1 such that Σ i ai converges. The metric P1 is defined by setting, for each pair of elements {aiだ1 and {biだ1 in My ai- b i-1 We were unable to transcribe this image
Let (Mi,p) be the metric space introduced in the last homework set. That is, M is the set of all real sequences {aife1 such...
Topology
3. Either prove or disprove each of the following statements: (a) If d and p map (X, d) X, then the identity topologically equivalent metrics (X, p) and its inverse are both continuous are two on (b) Any totally bounded metric space is compact. (c) The open interval (-r/2, n/2) is homeomorphic to R (d) If X and Y are homeomorphic metric spaces, then X is complete if and only if Y is complete (e) Let X and Y...
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