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Step * of Lemma iff_symmetry

∀[A,B:ℙ].  (A ⇐⇒ B ⇐⇒ B ⇐⇒ A)
BY
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Latex:

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


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Latex:
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