Step
*
2
3
1
1
of Lemma
lattice-fset-meet-is-glb
1. l : BoundedLattice
2. eq : EqDecider(Point(l))
3. s : fset(Point(l))
4. x : Point(l)
5. ∀[v:Point(l)]. ((∀x:Point(l). (x ∈ s
⇒ v ≤ x))
⇒ v ≤ /\(s))
6. ¬x ∈ s
7. v : Point(l)
8. ∀x@0:Point(l). (x@0 ∈ fset-add(eq;x;s)
⇒ v ≤ x@0)
9. x ∧ /\(s) ≤ x
10. x ∧ /\(s) ≤ /\(s)
11. ∀x@0:Point(l). (x@0 ≤ x
⇒ x@0 ≤ /\(s)
⇒ x@0 ≤ x ∧ /\(s))
⊢ v ≤ x
BY
{ (BHyp -4 THEN EAuto 1) }
Latex:
Latex:
1. l : BoundedLattice
2. eq : EqDecider(Point(l))
3. s : fset(Point(l))
4. x : Point(l)
5. \mforall{}[v:Point(l)]. ((\mforall{}x:Point(l). (x \mmember{} s {}\mRightarrow{} v \mleq{} x)) {}\mRightarrow{} v \mleq{} /\mbackslash{}(s))
6. \mneg{}x \mmember{} s
7. v : Point(l)
8. \mforall{}x@0:Point(l). (x@0 \mmember{} fset-add(eq;x;s) {}\mRightarrow{} v \mleq{} x@0)
9. x \mwedge{} /\mbackslash{}(s) \mleq{} x
10. x \mwedge{} /\mbackslash{}(s) \mleq{} /\mbackslash{}(s)
11. \mforall{}x@0:Point(l). (x@0 \mleq{} x {}\mRightarrow{} x@0 \mleq{} /\mbackslash{}(s) {}\mRightarrow{} x@0 \mleq{} x \mwedge{} /\mbackslash{}(s))
\mvdash{} v \mleq{} x
By
Latex:
(BHyp -4 THEN EAuto 1)
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