12. Let A = {A,, : ne Z, where A, = (n- 1,n+ 1). (a) Find A and prove your conjecture. (b) Find R-UA and prove your conjecture. 13. Prove the generalization, to an arbitrary collection of sets, of the DeMorgan's law 14. Prove : if A, B are two families of sets such that AC B, then JAC JB.

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Related Book For  answer-question

An Introduction to Analysis

4th edition

Authors: William R. Wade

ISBN: 978-0132296380