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Step * of Lemma retraction_wf

∀[T:Type]. ∀[f:T ⟶ T].  (retraction(T;f) ∈ ℙ)
BY
{ (Unfold `retraction` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[f:T  {}\mrightarrow{}  T].    (retraction(T;f)  \mmember{}  \mBbbP{})


By

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Latex:
(Unfold  `retraction`  0  THEN  Auto)

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