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Step * of Lemma retraction_wf

∀[X,A:Type]. ∀[d:metric(X)].  retraction(X;d;A) ∈ Type supposing A ⊆r X
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[X,A:Type].  \mforall{}[d:metric(X)].    retraction(X;d;A)  \mmember{}  Type  supposing  A  \msubseteq{}r  X


By

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Latex:
ProveWfLemma

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