a) Let A = (-0, 5] cR, if R has the left ray topology. Find Āand Int(A). b) Let A = {1,2,3} CR, if R has the usual topology. Find Ext(A) and Bd(A). c) Let A = {1,2}cX = {1,2,3,4,5,}, if X has the cofinite topology. Find Ā, Int(A) and Bd(A).

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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a) Let A = (-∞, 5] CR, if R has the left ray topology.
Find Āand Int(A).
b) Let A = {1,2,3} C R, if R has the usual topology.
Find Ext(A) and Bd(A).
c) Let A = {1,2}c X = {1,2,3,4,5, } , if X has the cofinite topology.
Find Ā, Int(A) and Bd(A).
Transcribed Image Text:a) Let A = (-∞, 5] CR, if R has the left ray topology. Find Āand Int(A). b) Let A = {1,2,3} C R, if R has the usual topology. Find Ext(A) and Bd(A). c) Let A = {1,2}c X = {1,2,3,4,5, } , if X has the cofinite topology. Find Ā, Int(A) and Bd(A).
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