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Step * 3 of Lemma face_lattice-fset-join-eq-1


1. I : fset(ℕ)
2. ∃x:Point(face_lattice(I)). (x ∈ {} ∧ (x = 1 ∈ Point(face_lattice(I))))
⊢ \/({}) = 1 ∈ Point(face_lattice(I))
BY
{ ExRepD }

1
1. I : fset(ℕ)
2. x : Point(face_lattice(I))
3. x ∈ {}
4. x = 1 ∈ Point(face_lattice(I))
⊢ \/({}) = 1 ∈ Point(face_lattice(I))

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Latex:

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Latex:

1.  I  :  fset(\mBbbN{})
2.  \mexists{}x:Point(face\_lattice(I)).  (x  \mmember{}  \{\}  \mwedge{}  (x  =  1))
\mvdash{}  \mbackslash{}/(\{\})  =  1


By

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Latex:
ExRepD

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