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Step * of Lemma mdist_wf

∀[X:Type]. ∀[d:metric(X)]. ∀[x,y:X].  (mdist(d;x;y) ∈ ℝ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[X:Type].  \mforall{}[d:metric(X)].  \mforall{}[x,y:X].    (mdist(d;x;y)  \mmember{}  \mBbbR{})


By

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Latex:
ProveWfLemma

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