Step
*
1
of Lemma
ispair-pair
1. t : Base
2. x : Base
3. y : Base
4. (if t is a pair then inl x otherwise inr y )↓
5. (t)↓
6. ∀[u,v:Top]. (if t is a pair then u otherwise v ~ v)
7. inr y ~ inl x@i
⊢ t ∈ Top × Top
BY
{ (RW CanonicalDiffC (-1) THEN Auto) }
Latex:
Latex:
1. t : Base
2. x : Base
3. y : Base
4. (if t is a pair then inl x otherwise inr y )\mdownarrow{}
5. (t)\mdownarrow{}
6. \mforall{}[u,v:Top]. (if t is a pair then u otherwise v \msim{} v)
7. inr y \msim{} inl x@i
\mvdash{} t \mmember{} Top \mtimes{} Top
By
Latex:
(RW CanonicalDiffC (-1) THEN Auto)
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