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Who Cites is permutation?
is_permutationDef  f is permutation on A == f is 1-1 corr
is_one_one_corrDef  f is 1-1 corr == g:(BA). InvFuns(A;B;f;g)
Thm*  A,B:Type, f:(AB). (f is 1-1 corr)  Prop
inv_funs_2Def  InvFuns(A;B;f;g) == (x:Ag(f(x)) = x) & (y:Bf(g(y)) = y)
Thm*  f:(AB), g:(BA). InvFuns(A;B;f;g Prop

Syntax:f is permutation on A has structure: is_permutation(Af)

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applyfunctionuniverseequalmemberprop
andallexists!abstraction
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WhoCites Definitions DiscreteMath Sections DiscrMathExt Doc