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Step * of Lemma iseg_nil

∀[T:Type]. ∀L:T List. (L ≤ [] ⇐⇒ ↑null(L))
BY
{ (Unfold `iseg` 0 THEN Obvious) }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}L:T  List.  (L  \mleq{}  []  \mLeftarrow{}{}\mRightarrow{}  \muparrow{}null(L))


By

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Latex:
(Unfold  `iseg`  0  THEN  Obvious)

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