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Step * of Lemma psub_antisymmetry

∀[P,Q:formula()].  (P = Q ∈ formula()) supposing (Q ⊆ P and P ⊆ Q)
BY
{ (Auto THEN RepeatFor 2 ((FLemma `prank-psub` [-2] THENA Auto)) THEN SplitOrHyps THEN Auto) }

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Latex:

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Latex:
\mforall{}[P,Q:formula()].    (P  =  Q)  supposing  (Q  \msubseteq{}  P  and  P  \msubseteq{}  Q)


By

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Latex:
(Auto  THEN  RepeatFor  2  ((FLemma  `prank-psub`  [-2]  THENA  Auto))  THEN  SplitOrHyps  THEN  Auto)

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