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Step * of Lemma trivial-rsub-rleq

∀[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)  \mleq{}  a;r0  \mleq{}  d)


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