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Step * of Lemma isleft-symmetry

∀g:OrientedPlane. ∀a,b:Point. ∀c:{c:Point| a # bc} .  isleft(a;b;c) = isleft(b;c;a)
BY
{ (Auto THEN ((BLemma `iff_imp_equal_bool` THENM RW assert_pushdownC 0) THENA Auto) THEN EAuto 2) }

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Latex:

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Latex:
\mforall{}g:OrientedPlane.  \mforall{}a,b:Point.  \mforall{}c:\{c:Point|  a  \#  bc\}  .    isleft(a;b;c)  =  isleft(b;c;a)


By

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Latex:
(Auto  THEN  ((BLemma  `iff\_imp\_equal\_bool`  THENM  RW  assert\_pushdownC  0)  THENA  Auto)  THEN  EAuto  2)

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