Question 6. In a topological space (X.r) a subset Bof X is called a 7- open subset of X if Bc(B)u(B). The family of all y-open subsets of X is denoted by 0(X). Show that 0(X) is closed under arbitrary union.

Question 6. In a topological space (X.r) a subset Bof X is called a 7- open subset of X if Bc(B)u(B). The family of all y-open subsets of X is denoted by 0(X). Show that 0(X) is closed under arbitrary union.

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

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