Step
*
of Lemma
product-unit-disjoint
∀[T,S:Type]. (¬T × S ⋂ Unit)
BY
{ (Auto THEN D 0 THEN Auto THEN RenameVar `x' (-1) THEN Assert ⌜ispair(x) = tt ∧ ispair(x) = ff⌝⋅ THEN Auto) }
1
1. T : Type
2. S : Type
3. x : T × S ⋂ Unit
⊢ ispair(x) = tt
2
1. T : Type
2. S : Type
3. x : T × S ⋂ Unit
4. ispair(x) = tt
⊢ ispair(x) = ff
Latex:
Latex:
\mforall{}[T,S:Type]. (\mneg{}T \mtimes{} S \mcap{} Unit)
By
Latex:
(Auto
THEN D 0
THEN Auto
THEN RenameVar `x' (-1)
THEN Assert \mkleeneopen{}ispair(x) = tt \mwedge{} ispair(x) = ff\mkleeneclose{}\mcdot{}
THEN Auto)
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