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Step * of Lemma rinv-rminus

∀[x:ℝ]. -(rinv(x)) = rinv(-(x)) supposing x ≠ r0
BY
{ (Intros THEN BLemma `rmul-inverse-is-rinv` THEN EAuto 1) }

1
1. x : ℝ
2. x ≠ r0
⊢ (-(x) * -(rinv(x))) = r1

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Latex:

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Latex:
\mforall{}[x:\mBbbR{}].  -(rinv(x))  =  rinv(-(x))  supposing  x  \mneq{}  r0


By

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Latex:
(Intros  THEN  BLemma  `rmul-inverse-is-rinv`  THEN  EAuto  1)

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