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Step * 1 1 of Lemma rmin-req

.....assertion..... 
1. x : ℝ
2. y : ℝ
3. y ≤ x
4. rmax(-(x);-(y)) = -(y)
⊢ -(rmax(-(x);-(y))) = -(-(y))
BY
{ (RWO "-1" 0 THEN Auto) }

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Latex:

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Latex:
.....assertion..... 
1.  x  :  \mBbbR{}
2.  y  :  \mBbbR{}
3.  y  \mleq{}  x
4.  rmax(-(x);-(y))  =  -(y)
\mvdash{}  -(rmax(-(x);-(y)))  =  -(-(y))


By

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Latex:
(RWO  "-1"  0  THEN  Auto)

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