Step * of Lemma straight-angles-not-lt

g:EuclideanPlane. ∀a,b,c,x,y,z:Point.  (a-b-c  x-y-z  abc < xyz))
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1
1. EuclideanPlane
2. Point
3. Point
4. Point
5. Point
6. Point
7. Point
8. a-b-c
9. x-y-z
⊢ ¬abc < xyz


Latex:


Latex:
\mforall{}g:EuclideanPlane.  \mforall{}a,b,c,x,y,z:Point.    (a-b-c  {}\mRightarrow{}  x-y-z  {}\mRightarrow{}  (\mneg{}abc  <  xyz))


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Latex:
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