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ddellacosta/gist:ec53b5e56a4495855dae

Created September 27, 2014 03:03
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gistfile1.txt
(λx.P)[x := N] = λx.P;
(λy.P)[x := N] = λy.P[x := N], if y ̸∈ FV(N) or x ̸∈ FV(P);
(λy.P)[x := N] = λz.P[y := z][x := N], if y ∈ FV(N) and x ∈ FV(P).
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