Step * 1 of Lemma face_lattice-point-subtype


1. fset(ℕ)
2. fset(ℕ)
3. I ⊆ J
⊢ Point(face_lattice(I)) ⊆Point(face_lattice(J))
BY
(Unfold `face_lattice` THEN (D THENA Auto)) }

1
.....subterm..... T:t
1:n
1. fset(ℕ)
2. fset(ℕ)
3. I ⊆ J
4. Point(face-lattice(names(I);NamesDeq))@i
⊢ x ∈ Point(face-lattice(names(J);NamesDeq))


Latex:


Latex:

1.  I  :  fset(\mBbbN{})
2.  J  :  fset(\mBbbN{})
3.  I  \msubseteq{}  J
\mvdash{}  Point(face\_lattice(I))  \msubseteq{}r  Point(face\_lattice(J))


By


Latex:
(Unfold  `face\_lattice`  0  THEN  (D  0  THENA  Auto))




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