Step
*
of Lemma
apply-ifthenelse-pi1-eq
∀[T1,U1,T2,U2:Type]. ∀[x:T1 × U1]. ∀[y:T2 × U2]. ∀[b:𝔹].
((fst(if b then x else y fi )) = if b then fst(x) else fst(y) fi ∈ if b then T1 else T2 fi )
BY
{ ((UnivCD THENA Auto) THEN D (-1) THEN Reduce 0 THEN Auto) }
Latex:
Latex:
\mforall{}[T1,U1,T2,U2:Type]. \mforall{}[x:T1 \mtimes{} U1]. \mforall{}[y:T2 \mtimes{} U2]. \mforall{}[b:\mBbbB{}].
((fst(if b then x else y fi )) = if b then fst(x) else fst(y) fi )
By
Latex:
((UnivCD THENA Auto) THEN D (-1) THEN Reduce 0 THEN Auto)
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