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Step * of Lemma qsub-zero

∀[r:ℚ]. ((r - 0) = r ∈ ℚ)
BY
{ (xxxAutoxxx THEN QAddReduce 0) }

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Latex:

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Latex:
\mforall{}[r:\mBbbQ{}].  ((r  -  0)  =  r)


By

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Latex:
(xxxAutoxxx  THEN  QAddReduce  0)

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