The second one please Let U CR. Prove U is open if and only if U = U°O Prove that an open interval in R is an open set.Find an example of an infinite collection of closed sets whose union is not closed.

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) Find an example of an infinite collection of closed sets whose union is not closed.

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter10: Sequences, Series, And Probability

Section10.4: Mathematical Induction

Problem 46E

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The second one please

Let U CR. Prove U is open if and only if U = U°
O Prove that an open interval in R is an open set.
Find an example of an infinite collection of closed sets whose union is not closed.

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