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


1. Type
2. Point(free-dl(X))
3. Point(free-dl(X))
4. ↑fdl-is-1(y)
⊢ ↑fdl-is-1(y ∨ x)
BY
(SwapVars `x' `y' THEN MoveToConcl (-1) THEN UseWitness ⌜λa.Ax⌝⋅}

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


Latex:


Latex:

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


By


Latex:
(SwapVars  `x'  `y'  THEN  MoveToConcl  (-1)  THEN  UseWitness  \mkleeneopen{}\mlambda{}a.Ax\mkleeneclose{}\mcdot{})




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