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At: card union vs sigma 1

1. A : Type
2. B : Type
  f:((A+B)(i:2if i=0 A else B fi)),
  g:((i:2if i=0 A else B fi)(A+B)).
  InvFuns(A+B;i:2if i=0 A else B fi;f;g)


By: Witness: union_to_sigma | sigma_to_union
THEN
BackThru: 
Thm*  InvFuns(A+B;i:2if i=0 A else B fi;union_to_sigma;sigma_to_union)


Generated subgoals:

None

About:
productifthenelsenatural_numberunionfunctionuniverseexists
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(2steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc