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Step * of Lemma first0

∀[L:Top List]. (firstn(0;L) ~ [])
BY
{ (InductionOnList THEN RecUnfold `firstn` 0 THEN Reduce 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[L:Top  List].  (firstn(0;L)  \msim{}  [])


By

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Latex:
(InductionOnList  THEN  RecUnfold  `firstn`  0  THEN  Reduce  0  THEN  Auto)

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