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Who Cites union to sigma?
union_to_sigmaDef  union_to_sigma(e) == InjCase(ea. <0,a>; b. <1,b>)
Thm*  A,B:Type. union_to_sigma  (A+B)(i:2if i=0 A else B fi)

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pairproductifthenelsenatural_numberunion
decideapplyfunctionuniversemember
all!abstraction
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WhoCites Definitions DiscreteMath Sections DiscrMathExt Doc