Step
*
of Lemma
super-fact-unroll
∀[n:ℕ+]. ((n)!! ~ (n)! * (n - 1)!!)
BY
{ xxx(Auto
THEN RW (AddrC [2] UnfoldTopAbC) 0
THEN (RWO "primrec-unroll" 0 THENA Auto)
THEN Reduce 0
THEN Fold `super-fact` 0
THEN AutoSplit)xxx }
Latex:
Latex:
\mforall{}[n:\mBbbN{}\msupplus{}]. ((n)!! \msim{} (n)! * (n - 1)!!)
By
Latex:
xxx(Auto
THEN RW (AddrC [2] UnfoldTopAbC) 0
THEN (RWO "primrec-unroll" 0 THENA Auto)
THEN Reduce 0
THEN Fold `super-fact` 0
THEN AutoSplit)xxx
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