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Step * of Lemma rat-interval-intersection-symm

∀[I,J:ℚInterval].  (I ⋂ J = J ⋂ I ∈ ℚInterval)
BY
{ (Auto THEN (D 1 THEN D -1) THEN RepUR ``rat-interval-intersection`` 0 THEN EqCDA THEN Auto) }

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Latex:

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Latex:
\mforall{}[I,J:\mBbbQ{}Interval].    (I  \mcap{}  J  =  J  \mcap{}  I)


By

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Latex:
(Auto  THEN  (D  1  THEN  D  -1)  THEN  RepUR  ``rat-interval-intersection``  0  THEN  EqCDA  THEN  Auto)

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