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Step * 1 1 1 of Lemma rmax_lb

.....assertion..... 
1. x : ℝ
2. y : ℝ
3. z : ℝ
4. rnonneg(z + -(x))
5. rnonneg(z + -(y))
⊢ -(rmax(x;y)) = rmin(-(x);-(y))
BY
{ (RWW "rmin-req-rminus-rmax rminus-rminus" 0 THEN Auto) }

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Latex:

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Latex:
.....assertion..... 
1.  x  :  \mBbbR{}
2.  y  :  \mBbbR{}
3.  z  :  \mBbbR{}
4.  rnonneg(z  +  -(x))
5.  rnonneg(z  +  -(y))
\mvdash{}  -(rmax(x;y))  =  rmin(-(x);-(y))


By

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Latex:
(RWW  "rmin-req-rminus-rmax  rminus-rminus"  0  THEN  Auto)

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