Step
*
1
of Lemma
r2-left-pos-angle
1. a : ℝ^2
2. b : ℝ^2
⊢ (r0 < a⋅λi.if (i =z 0) then -(b 1) else b 0 fi )
⇒ (|a⋅b| < (||a|| * ||b||))
BY
{ ((RWO "r2-dot-product" 0 THENA Auto) THEN Reduce 0 THEN Auto) }
1
1. a : ℝ^2
2. b : ℝ^2
3. r0 < (((a 0) * -(b 1)) + ((a 1) * (b 0)))
⊢ |((a 0) * (b 0)) + ((a 1) * (b 1))| < (||a|| * ||b||)
Latex:
Latex:
1. a : \mBbbR{}\^{}2
2. b : \mBbbR{}\^{}2
\mvdash{} (r0 < a\mcdot{}\mlambda{}i.if (i =\msubz{} 0) then -(b 1) else b 0 fi ) {}\mRightarrow{} (|a\mcdot{}b| < (||a|| * ||b||))
By
Latex:
((RWO "r2-dot-product" 0 THENA Auto) THEN Reduce 0 THEN Auto)
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