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Step * of Lemma trivial-rsub-rless

∀a,d:ℝ.  uiff((a - d) < a;r0 < d)
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Latex:

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Latex:
\mforall{}a,d:\mBbbR{}.    uiff((a  -  d)  <  a;r0  <  d)


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Latex:
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