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Step * 1 1 1 of Lemma r2-left-or-right--pos-angle


1. a : ℝ^2
2. b : ℝ^2
3. c : ℝ^2
4. r2-left(a;c;b)
5. rv-pos-angle(2;a;c;b)
6. rv-pos-angle(2;b;a;c)
7. rv-pos-angle(2;c;b;a)
⊢ rv-pos-angle(2;a;b;c)
BY
{ (BLemma `rv-pos-angle-symmetry` THEN Auto) }

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Latex:

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Latex:

1.  a  :  \mBbbR{}\^{}2
2.  b  :  \mBbbR{}\^{}2
3.  c  :  \mBbbR{}\^{}2
4.  r2-left(a;c;b)
5.  rv-pos-angle(2;a;c;b)
6.  rv-pos-angle(2;b;a;c)
7.  rv-pos-angle(2;c;b;a)
\mvdash{}  rv-pos-angle(2;a;b;c)


By

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Latex:
(BLemma  `rv-pos-angle-symmetry`  THEN  Auto)

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