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Step * of Lemma matrix-plus-sq-real-matrix-add

∀[A,B:Top].  (A + B ~ A + B)
BY
{ (RepUR ``matrix-plus real-matrix-add mx matrix-ap`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[A,B:Top].    (A  +  B  \msim{}  A  +  B)


By

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Latex:
(RepUR  ``matrix-plus  real-matrix-add  mx  matrix-ap``  0  THEN  Auto)

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