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Answers and rating deltas for

How can I prove that elem z (xs ++ ys) == elem z xs || elem z ys?

Author Votes Δ
chi 5 +1.17
jub0bs 4 -0.24
user4640123 2 -0.78
Tom Ellis 1 -3.43
Last visited: Jan 2, 2016, 3:59:50 AM