Step * 1 2 1 2 1 of Lemma lattice-fset-join-is-lub


1. BoundedLattice
2. eq EqDecider(Point(l))
3. fset(Point(l))
4. Point(l)
5. ∀[x:Point(l)]. x ≤ \/(s) supposing x ∈ s
6. ¬x ∈ s
7. x@0 Point(l)
8. x@0 ∈ s
⊢ \/(s) ≤ x ∨ \/(s)
BY
(InstLemma `lattice-join-is-lub` [⌜l⌝]⋅ THEN Auto) }


Latex:


Latex:

1.  l  :  BoundedLattice
2.  eq  :  EqDecider(Point(l))
3.  s  :  fset(Point(l))
4.  x  :  Point(l)
5.  \mforall{}[x:Point(l)].  x  \mleq{}  \mbackslash{}/(s)  supposing  x  \mmember{}  s
6.  \mneg{}x  \mmember{}  s
7.  x@0  :  Point(l)
8.  x@0  \mmember{}  s
\mvdash{}  \mbackslash{}/(s)  \mleq{}  x  \mvee{}  \mbackslash{}/(s)


By


Latex:
(InstLemma  `lattice-join-is-lub`  [\mkleeneopen{}l\mkleeneclose{}]\mcdot{}  THEN  Auto)




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