Step
*
2
of Lemma
rsqrt-unique2
1. x : {x:ℝ| r0 ≤ x}
2. s : ℝ
3. ¬¬((s = rsqrt(x)) ∨ (s = -(rsqrt(x))))
⊢ (s * s) = x
BY
{ ((Assert Stable{(s * s) = x} BY
Auto)
THEN (BackThruHyp' (-1) THEN Auto)
THEN Thin (-1)
THEN (SupposeMore (-1) THENA Auto)
THEN D -1
THEN (D 0 THENA Auto)
THEN D -1
THEN (RWO "-1" 0 THENA Auto)
THEN nRNorm 0
THEN RWO "rsqrt_squared" 0
THEN Auto) }
Latex:
Latex:
1. x : \{x:\mBbbR{}| r0 \mleq{} x\}
2. s : \mBbbR{}
3. \mneg{}\mneg{}((s = rsqrt(x)) \mvee{} (s = -(rsqrt(x))))
\mvdash{} (s * s) = x
By
Latex:
((Assert Stable\{(s * s) = x\} BY
Auto)
THEN (BackThruHyp' (-1) THEN Auto)
THEN Thin (-1)
THEN (SupposeMore (-1) THENA Auto)
THEN D -1
THEN (D 0 THENA Auto)
THEN D -1
THEN (RWO "-1" 0 THENA Auto)
THEN nRNorm 0
THEN RWO "rsqrt\_squared" 0
THEN Auto)
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