Step
*
of Lemma
stable-union-metric-subspace
∀[X:Type]. ∀[d:metric(X)]. ∀[T:Type]. ∀[P:T ⟶ X ⟶ ℙ].
metric-subspace(X;d;stable-union(X;T;i,x.P[i;x])) supposing ∀i:T. ∀x,y:X. (P[i;x]
⇒ y ≡ x
⇒ P[i;y])
BY
{ (Auto THEN (D 0 THENL [Auto; ((D 0 THENA Auto) THEN D -1 THEN Auto)])) }
1
1. X : Type
2. d : metric(X)
3. T : Type
4. P : T ⟶ X ⟶ ℙ
5. ∀i:T. ∀x,y:X. (P[i;x]
⇒ y ≡ x
⇒ P[i;y])
6. a : X
7. ¬¬(∃i:T. P[i;a])
8. x : X
9. x ≡ a
⊢ x ∈ stable-union(X;T;i,x.P[i;x])
Latex:
Latex:
\mforall{}[X:Type]. \mforall{}[d:metric(X)]. \mforall{}[T:Type]. \mforall{}[P:T {}\mrightarrow{} X {}\mrightarrow{} \mBbbP{}].
metric-subspace(X;d;stable-union(X;T;i,x.P[i;x]))
supposing \mforall{}i:T. \mforall{}x,y:X. (P[i;x] {}\mRightarrow{} y \mequiv{} x {}\mRightarrow{} P[i;y])
By
Latex:
(Auto THEN (D 0 THENL [Auto; ((D 0 THENA Auto) THEN D -1 THEN Auto)]))
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