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Step * of Lemma ring_hom_wf

∀[r,s:RngSig].  (RingHom(r;s) ∈ ℙ)
BY
{ Unfold `ring_hom` 0 THEN Auto }

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Latex:

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Latex:
\mforall{}[r,s:RngSig].    (RingHom(r;s)  \mmember{}  \mBbbP{})


By

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Latex:
Unfold  `ring\_hom`  0  THEN  Auto

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