A question on my probability problem set reads: If the sequence of events A(adsbygoogle = window.adsbygoogle || []).push({}); _{n}is non-decreasing (i.e. A_{n}is a superset of A_{n+1}for all n), prove the following

[tex]P[A_n] \downarrow P[\bigcap_{i=0}^\infty A_i][/tex]

I just need to know what the heck the down arrow means

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# Homework Help: Down arrow? Probability question

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