Step
*
2
1
of Lemma
extend-name-morph-face-map
1. I : Cname List
2. K : Cname List
3. f : name-morph(I;K)
4. z : Cname
5. x : Cname
6. i : ℕ2
7. ¬(x ∈ K)
8. ¬(z ∈ I)
9. x1 : nameset([z / I])
10. x1 = z ∈ Cname
11. x1 = z ∈ ℤ
⊢ if isname(x) then i else x fi = if isname(i) then f i else i fi ∈ extd-nameset(K)
BY
{ (TACTIC:(OReduce 0 THENA Auto)
THEN (Subst' isname(x) ~ tt 0 THENA (DVar `x' THEN RepUR ``isname`` 0 THEN Auto))
THEN (Subst' isname(i) ~ ff 0 THENA (RepUR ``isname`` 0 THEN Auto))
THEN Reduce 0
THEN Auto) }
Latex:
Latex:
1. I : Cname List
2. K : Cname List
3. f : name-morph(I;K)
4. z : Cname
5. x : Cname
6. i : \mBbbN{}2
7. \mneg{}(x \mmember{} K)
8. \mneg{}(z \mmember{} I)
9. x1 : nameset([z / I])
10. x1 = z
11. x1 = z
\mvdash{} if isname(x) then i else x fi = if isname(i) then f i else i fi
By
Latex:
(TACTIC:(OReduce 0 THENA Auto)
THEN (Subst' isname(x) \msim{} tt 0 THENA (DVar `x' THEN RepUR ``isname`` 0 THEN Auto))
THEN (Subst' isname(i) \msim{} ff 0 THENA (RepUR ``isname`` 0 THEN Auto))
THEN Reduce 0
THEN Auto)
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