Step
*
of Lemma
set-elim
∀[A:Type]. ∀[B:A ⟶ Type]. ∀x:Image((a:A × B[a]),(λp.(fst(p)))). ((x ∈ A) ∧ (↓B[x]))
BY
{ TACTIC:((UnivCD THENA Auto) THEN D -1 THEN Auto) }
1
1. A : Type
2. B : A ⟶ Type
3. [%] : a:A × B[a]
⊢ fst(%) ∈ A
2
1. A : Type
2. B : A ⟶ Type
3. [%] : a:A × B[a]
4. (λp.(fst(p))) % ∈ A
⊢ ↓B[(λp.(fst(p))) %]
Latex:
Latex:
\mforall{}[A:Type]. \mforall{}[B:A {}\mrightarrow{} Type]. \mforall{}x:Image((a:A \mtimes{} B[a]),(\mlambda{}p.(fst(p)))). ((x \mmember{} A) \mwedge{} (\mdownarrow{}B[x]))
By
Latex:
TACTIC:((UnivCD THENA Auto) THEN D -1 THEN Auto)
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