(i) If A E F and BE F then ANBE F. (ii) If A and B are subsets of N such that ANBE F then either A E F or BE F. (iii) If F1 and F2 are sigma algebras on 2 then FiN F2 is a sigma algebra.

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Q: Don't use chat gpt It Chatgpt means downvote

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Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence.  It was invented by German mathematician Carl Friedrich Gauss.