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Who Cites sigma to union?
sigma_to_unionDef  sigma_to_union(e) == e/i,u. if i=0 inl(u) else inr(u) fi
Thm*  A,B:Type. sigma_to_union  (i:2if i=0 A else B fi)(A+B)
eq_intDef  i=j == if i=j true ; false fi
Thm*  i,j:. (i=j 

About:
spreadproductboolbfalsebtrue
ifthenelseintnatural_numberint_equnion
inlinrapplyfunctionuniversememberall
!abstraction
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WhoCites Definitions DiscreteMath Sections DiscrMathExt Doc