4. Let (X,T) be the topological space defined in question 2. Let A = {1,2,3}, then the set of limit points of A is a. A b. {4} c. {2,4} d. None of the above

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter4: Quadrilaterals
Section4.1: Properties Of A Parallelogram
Problem 44E
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I need only the solution of number 4
Choose the correct answer and attach the details of your work.
1. Let X = {1,2,3, 4}. A topology on X is
a. T = {0, X, {1}, {2}}
b. T2 = {6, X, {1}, {3,4}}
c. T3 = {ó, X, {1}, {1,3, 4}}
d. None of the above
2. Let X = {1,2, 3, 4} and let T = {ø, X, {1}, {3},{1,3}} be a topology on X, then {2, 4} is
a. open in (X, T)
b. closed in (X,T)
c. clopen in (X, T)
d. neither open nor closed
3. Let (X, T) be the topological space defined in question 2., then the closure of {2} is
а. X
b. {2, 4}
c. {1,2, 4}
d. None of the above
4. Let (X, T) be the topological space defined in question 2. Let A = {1, 2,3}, then the set of limit
points of A is
a. A
b. {4}
c. {2,4}
d. None of the above
Transcribed Image Text:Choose the correct answer and attach the details of your work. 1. Let X = {1,2,3, 4}. A topology on X is a. T = {0, X, {1}, {2}} b. T2 = {6, X, {1}, {3,4}} c. T3 = {ó, X, {1}, {1,3, 4}} d. None of the above 2. Let X = {1,2, 3, 4} and let T = {ø, X, {1}, {3},{1,3}} be a topology on X, then {2, 4} is a. open in (X, T) b. closed in (X,T) c. clopen in (X, T) d. neither open nor closed 3. Let (X, T) be the topological space defined in question 2., then the closure of {2} is а. X b. {2, 4} c. {1,2, 4} d. None of the above 4. Let (X, T) be the topological space defined in question 2. Let A = {1, 2,3}, then the set of limit points of A is a. A b. {4} c. {2,4} d. None of the above
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