Step
*
of Lemma
real-vec-norm-positive-iff
∀n:ℕ. ∀x:ℝ^n. (r0 < ||x||
⇐⇒ ∃i:ℕn. r0 ≠ x i)
BY
{ ((UnivCD THENA Auto) THEN Unfold `real-vec-norm` 0) }
1
1. n : ℕ
2. x : ℝ^n
⊢ r0 < rsqrt(x⋅x)
⇐⇒ ∃i:ℕn. r0 ≠ x i
Latex:
Latex:
\mforall{}n:\mBbbN{}. \mforall{}x:\mBbbR{}\^{}n. (r0 < ||x|| \mLeftarrow{}{}\mRightarrow{} \mexists{}i:\mBbbN{}n. r0 \mneq{} x i)
By
Latex:
((UnivCD THENA Auto) THEN Unfold `real-vec-norm` 0)
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