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Step * 1 of Lemma rminus-reverses-rleq


1. x : ℝ
2. y : ℝ
3. rnonneg(y - x)
⊢ rnonneg(-(x) - -(y))
BY
{ (nRNorm 0 THEN nRNorm (-1) THEN Auto) }

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Latex:

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Latex:

1.  x  :  \mBbbR{}
2.  y  :  \mBbbR{}
3.  rnonneg(y  -  x)
\mvdash{}  rnonneg(-(x)  -  -(y))


By

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Latex:
(nRNorm  0  THEN  nRNorm  (-1)  THEN  Auto)

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