Step
*
of Lemma
set-metric-subspace
∀[X:Type]. ∀[d:metric(X)]. ∀[P:X ⟶ ℙ]. metric-subspace(X;d;{x:X| P[x]} ) supposing ∀x,y:X. (P[x]
⇒ y ≡ x
⇒ P[y])
BY
{ (Auto THEN (D 0 THENL [Auto; ((D 0 THENA Auto) THEN D -1 THEN Auto)])) }
Latex:
Latex:
\mforall{}[X:Type]. \mforall{}[d:metric(X)]. \mforall{}[P:X {}\mrightarrow{} \mBbbP{}]. metric-subspace(X;d;\{x:X| P[x]\} ) supposing \mforall{}x,y:X. (P[x] \000C{}\mRightarrow{} y \mequiv{} x {}\mRightarrow{} P[y])
By
Latex:
(Auto THEN (D 0 THENL [Auto; ((D 0 THENA Auto) THEN D -1 THEN Auto)]))
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