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Step * 1 of Lemma rabs-positive-iff


1. x : ℝ
⊢ r0 < |x - r0| ⇐⇒ r0 < |x|
BY
{ (nRNorm 0 THEN Auto) }

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Latex:

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Latex:

1.  x  :  \mBbbR{}
\mvdash{}  r0  <  |x  -  r0|  \mLeftarrow{}{}\mRightarrow{}  r0  <  |x|


By

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Latex:
(nRNorm  0  THEN  Auto)

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