(4steps total) PfGloss PrintForm Definitions DiscreteMath Sections DiscrMathExt Doc
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At: fun with inv2 is surj

  A,B:Type, f:(AB), g:(BA). InvFuns(A;B;f;g Surj(ABf)

By: Def of InvFuns(A;B;f;g)


Generated subgoal:

1 1. A : Type
2. B : Type
3. f : AB
4. g : BA
5. x:Ag(f(x)) = x
6. y:Bf(g(y)) = y
  Surj(ABf)

3 steps

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functionuniverseimpliesall
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(4steps total) PfGloss PrintForm Definitions DiscreteMath Sections DiscrMathExt Doc