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Step * of Lemma rat-sign-change-list_wf

∀[f:(ℤ × ℕ+) ⟶ (ℤ × ℕ+)]. ∀[a,b:ℤ × ℕ+]. ∀[L:(ℤ × ℕ+) List].  (rat-sign-change-list(f;a;b;L) ∈ ℙ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[f:(\mBbbZ{}  \mtimes{}  \mBbbN{}\msupplus{})  {}\mrightarrow{}  (\mBbbZ{}  \mtimes{}  \mBbbN{}\msupplus{})].  \mforall{}[a,b:\mBbbZ{}  \mtimes{}  \mBbbN{}\msupplus{}].  \mforall{}[L:(\mBbbZ{}  \mtimes{}  \mBbbN{}\msupplus{})  List].    (rat-sign-change-list(f;a;b;L)  \mmember{}  \mBbbP{})


By

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Latex:
ProveWfLemma

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