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Step * of Lemma null_append

∀[L1:Top List]. ∀[L2:Top].  (null(L1 @ L2) ~ null(L1) ∧b null(L2))
BY
{ (InductionOnList THEN Reduce 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[L1:Top  List].  \mforall{}[L2:Top].    (null(L1  @  L2)  \msim{}  null(L1)  \mwedge{}\msubb{}  null(L2))


By

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Latex:
(InductionOnList  THEN  Reduce  0  THEN  Auto)

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