Step * 1 2 1 1 of Lemma fdl-1-join-irreducible


1. Type
2. Point(free-dl(X))
3. ¬↑fdl-is-1(x)
4. Point(free-dl(X))
5. x ∨ 1 ∈ Point(free-dl(X))
6. ↑fdl-is-1(y)
⊢ 1 ∈ Point(free-dl(X))
BY
(RWO "fdl-eq-1" THEN Auto) }


Latex:


Latex:

1.  X  :  Type
2.  x  :  Point(free-dl(X))
3.  \mneg{}\muparrow{}fdl-is-1(x)
4.  y  :  Point(free-dl(X))
5.  x  \mvee{}  y  =  1
6.  \muparrow{}fdl-is-1(y)
\mvdash{}  y  =  1


By


Latex:
(RWO  "fdl-eq-1"  0  THEN  Auto)




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