Definitions core StandardLIB Doc
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Some definitions of interest.
pi1Def 1of(t) == t.1
Thm* A:Type, B:(AType), p:(a:AB(a)). 1of(p A
pi2Def 2of(t) == t.2
Thm* A:Type, B:(AType), p:(a:AB(a)). 2of(p B(1of(p))

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Definitions core StandardLIB Doc