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Step * of Lemma fseg_cons2

∀[T:Type]. ∀x:T. ∀[L1,L2:T List].  (fseg(T;L1;L2) ⇒ fseg(T;L1;[x / L2]))
BY
{ xxx(Unfold `fseg` 0 THEN Auto THEN ExRepD THEN InstConcl [⌜[x / L]⌝]⋅ THEN Reduce 0 THEN Auto)xxx }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}x:T.  \mforall{}[L1,L2:T  List].    (fseg(T;L1;L2)  {}\mRightarrow{}  fseg(T;L1;[x  /  L2]))


By

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Latex:
xxx(Unfold  `fseg`  0  THEN  Auto  THEN  ExRepD  THEN  InstConcl  [\mkleeneopen{}[x  /  L]\mkleeneclose{}]\mcdot{}  THEN  Reduce  0  THEN  Auto)xxx

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