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Step * of Lemma real-vec-dist-symmetry

∀[n:ℕ]. ∀[x,y:ℝ^n].  (d(x;y) = d(y;x))
BY
{ (Auto THEN Unfold `real-vec-dist` 0 THEN Unfold `real-vec-norm` 0 THEN BLemma `rsqrt_functionality` THEN Auto) }

1
1. n : ℕ
2. x : ℝ^n
3. y : ℝ^n
⊢ x - y⋅x - y = y - x⋅y - x

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Latex:

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Latex:
\mforall{}[n:\mBbbN{}].  \mforall{}[x,y:\mBbbR{}\^{}n].    (d(x;y)  =  d(y;x))


By

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Latex:
(Auto
  THEN  Unfold  `real-vec-dist`  0
  THEN  Unfold  `real-vec-norm`  0
  THEN  BLemma  `rsqrt\_functionality`
  THEN  Auto)

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