Step
*
of Lemma
spread-sq-pi12
∀[t:Top]. ∀[P:Base]. P[fst(t);snd(t)] ~ let x,y = t in P[x;y] supposing strict4(λx,y,z,w. P[x;y])
BY
{ (Auto⋅ THEN SqequalSqle THEN (BLemma `spread-sqle-pi12` ORELSE BLemma `pi12-sqle-spread`) THEN Auto) }
1
1. t : Top
2. P : Base
3. strict4(λx,y,z,w. P[x;y])
4. u : Base@i
5. v : Base@i
⊢ P[exception(u; v);exception(u; v)] ~ exception(u; v)
Latex:
Latex:
\mforall{}[t:Top]. \mforall{}[P:Base]. P[fst(t);snd(t)] \msim{} let x,y = t in P[x;y] supposing strict4(\mlambda{}x,y,z,w. P[x;y])
By
Latex:
(Auto\mcdot{} THEN SqequalSqle THEN (BLemma `spread-sqle-pi12` ORELSE BLemma `pi12-sqle-spread`) THEN Auto)
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