Step * of Lemma colinear-implies-congruent_or_midpoint

e:BasicGeometry. ∀M,A,B:Point.  (Colinear(A;M;B)  MA ≅ MB  (¬¬(A ≡ B ∨ A=M=B)))
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1
1. BasicGeometry
2. Point
3. Point
4. Point
5. Colinear(A;M;B)
6. MA ≅ MB
⊢ ¬¬(A ≡ B ∨ A=M=B)


Latex:


Latex:
\mforall{}e:BasicGeometry.  \mforall{}M,A,B:Point.    (Colinear(A;M;B)  {}\mRightarrow{}  MA  \mcong{}  MB  {}\mRightarrow{}  (\mneg{}\mneg{}(A  \mequiv{}  B  \mvee{}  A=M=B)))


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