Proposition 2.18. Let (X,T) be a topological space : (1) (A°)° = A°. (2) ACB⇒ A° C B° for all A, B € X. (3) (An B) = An B° for all A, B E X.
Proposition 2.18. Let (X,T) be a topological space : (1) (A°)° = A°. (2) ACB⇒ A° C B° for all A, B € X. (3) (An B) = An B° for all A, B E X.
Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Transcribed Image Text:Proposition 2.18. Let (X,T) be a topological space :
(1) (A°)° = A°.
(2) ACB⇒ A CB
(3) (An B) = Aºn B°
for all A, B € X.
for all A, B E X.
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