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


1. Type
2. Point(free-dl(X))
3. Point(free-dl(X))
⊢ (¬↑fdl-is-1(x))  (¬↑fdl-is-1(y))  (¬↑fdl-is-1(x ∨ y))
BY
UseWitness ⌜λa,b,c. Ax⌝⋅ }

1
1. Type
2. Point(free-dl(X))
3. Point(free-dl(X))
⊢ λa,b,c. Ax ∈ (¬↑fdl-is-1(x))  (¬↑fdl-is-1(y))  (¬↑fdl-is-1(x ∨ y))


Latex:


Latex:

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


By


Latex:
UseWitness  \mkleeneopen{}\mlambda{}a,b,c.  Ax\mkleeneclose{}\mcdot{}




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