Step
*
of Lemma
poset-cat-dist-non-zero
∀[I:Cname List]. ∀[x,y:cat-ob(poset-cat(I))].
(null(filter(λx1.((x x1 =z 0) ∧b (y x1 =z 1));I)) ~ ff) supposing
((¬(x = y ∈ cat-ob(poset-cat(I)))) and
(cat-arrow(poset-cat(I)) x y))
BY
{ (InstLemma `poset-cat-dist-zero` []
THEN RepeatFor 4 (ParallelLast')
THEN (D 0 THENA Auto)
THEN (RWO "-2" (-1) THENA Auto)) }
1
1. I : Cname List
2. x : cat-ob(poset-cat(I))
3. y : cat-ob(poset-cat(I))
4. cat-arrow(poset-cat(I)) x y
5. uiff(x = y ∈ cat-ob(poset-cat(I));poset-cat-dist(I;x;y) ≤ 0)
6. ¬(poset-cat-dist(I;x;y) ≤ 0)
⊢ null(filter(λx1.((x x1 =z 0) ∧b (y x1 =z 1));I)) ~ ff
Latex:
Latex:
\mforall{}[I:Cname List]. \mforall{}[x,y:cat-ob(poset-cat(I))].
(null(filter(\mlambda{}x1.((x x1 =\msubz{} 0) \mwedge{}\msubb{} (y x1 =\msubz{} 1));I)) \msim{} ff) supposing
((\mneg{}(x = y)) and
(cat-arrow(poset-cat(I)) x y))
By
Latex:
(InstLemma `poset-cat-dist-zero` []
THEN RepeatFor 4 (ParallelLast')
THEN (D 0 THENA Auto)
THEN (RWO "-2" (-1) THENA Auto))
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