Let X (a, b, c, d} and T = {X, , {a,b}, {c,d}}, then * O Every open subset of X is clopen O An open proper subset of X cannot be clopen O None of the choices O An open proper subset of X may be clopen and may be not.

Let X (a, b, c, d} and T = {X, , {a,b}, {c,d}}, then * O Every open subset of X is clopen O An open proper subset of X cannot be clopen O None of the choices O An open proper subset of X may be clopen and may be not.

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, d} and T = {X, 0, {a,b}, {c,d}}, then
%3D
O Every open subset of X is clopen
O An open proper subset of X cannot be clopen
O None of the choices
O An open proper subset of X may be clopen and may be not.

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