Answered: 13. If t={X,Ø,{2,4},{1,4},{1,2,4},{4}}…

13. If t={X,Ø,{2,4},{1,4},{1,2,4},{4}} is a topology on X={1,2,3,4}, let A={1,3,4}, then Int(A)= * {1,4} O (4} O (1,3,4)

Elements Of Modern Algebra

8th Edition

ISBN:9781285463230

Author:Gilbert, Linda, Jimmie

Publisher:Gilbert, Linda, Jimmie

Chapter5: Rings, Integral Domains, And Fields

Section5.2: Integral Domains And Fields

Problem 18E: [Type here] 18. Prove that only idempotent elements in an integral domain are and . [Type here]

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Question

13. If T={X,Ø,{2,4},{1,4},{1,2,4},{4}} is a topology on X={1,2,3,4}, let A={1,3,4}, then Int(A)= *
{1,4}
O (4}
O {1.3,4)

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