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Step * of Lemma length-map-index

∀[f:Top]. ∀[L:Top List].  (||map-index(f;L)|| ~ ||L||)
BY
{ (Unfold `map-index` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[f:Top].  \mforall{}[L:Top  List].    (||map-index(f;L)||  \msim{}  ||L||)


By

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Latex:
(Unfold  `map-index`  0  THEN  Auto)

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