Step
*
2
2
1
of Lemma
fdl-1-join-irreducible
1. X : Type
2. x : Point(free-dl(X))
3. y : 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. X : Type
2. y : Point(free-dl(X))
3. x : 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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