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Step * of Lemma or_comm

∀[A,B:ℙ].  (A ∨ B ⇐⇒ B ∨ A)
BY
{ (Auto THEN D -1 THEN Auto) }

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Latex:

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Latex:
\mforall{}[A,B:\mBbbP{}].    (A  \mvee{}  B  \mLeftarrow{}{}\mRightarrow{}  B  \mvee{}  A)


By

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Latex:
(Auto  THEN  D  -1  THEN  Auto)

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