Let X be an infinite set. (a) Show that is a topology on X, called the finite co со

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter1: Fundamentals
Section1.7: Relations
Problem 20E: Give an example of a relation R on a nonempty set A that is symmetric and transitive, but not...
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Let X be an infinite set.
(a) Show that
Ti = {UC X:U = 0 or X\U is finite.}
is a topology on X, called the finite complement topology.
(c) Let p be an arbitrary point in X, and show that
T3 = {UC X :U = 0 or p e U}
is a topology on X, called the particular point topology.
(e) Determine whether
T5 = {UC X :U = X or X \U is infinite}
is a topology on X.
Transcribed Image Text:Let X be an infinite set. (a) Show that Ti = {UC X:U = 0 or X\U is finite.} is a topology on X, called the finite complement topology. (c) Let p be an arbitrary point in X, and show that T3 = {UC X :U = 0 or p e U} is a topology on X, called the particular point topology. (e) Determine whether T5 = {UC X :U = X or X \U is infinite} is a topology on X.
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