Let X={a,b,c} and B={{a,c},{a},{b}}. Let T be the topology generated by B and consider A={a,b}. With respect to T, compute the closure A¯¯¯ of A and the boundary ∂A=A¯¯∩(X∖A)¯¯ of A. Let T be the topology generated by B and consider B={a,c} viewed as a subspace of X. Is there a set that is closed relative to B that is not closed in X? Justify your answer.
Let X={a,b,c} and B={{a,c},{a},{b}}. Let T be the topology generated by B and consider A={a,b}. With respect to T, compute the closure A¯¯¯ of A and the boundary ∂A=A¯¯∩(X∖A)¯¯ of A. Let T be the topology generated by B and consider B={a,c} viewed as a subspace of X. Is there a set that is closed relative to B that is not closed in X? Justify your answer.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Let X={a,b,c} and B={{a,c},{a},{b}}.
- Let T be the topology generated by B and consider A={a,b}. With respect to T, compute the closure A¯¯¯ of A and the boundary ∂A=A¯¯∩(X∖A)¯¯ of A.
- Let T be the topology generated by B and consider B={a,c} viewed as a subspace of X. Is there a set that is closed relative to B that is not closed in X? Justify your answer.
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