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A question on my probability problem set reads: If the sequence of events A_{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
[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