Step
*
of Lemma
circle-not-colinear
∀e:EuclideanPlane. ∀a,b,c,d:Point.  (ab ≅ ac 
⇒ ab ≅ ad 
⇒ b ≠ c 
⇒ c ≠ d 
⇒ d ≠ b 
⇒ (¬Colinear(b;c;d)))
BY
{ (Auto THEN (D 0 THENA Auto) THEN InstLemma `no-three-colinear-on-circle` [⌜e⌝;⌜b⌝;⌜c⌝;⌜d⌝;⌜a⌝]⋅ THEN Auto) }
Latex:
Latex:
\mforall{}e:EuclideanPlane.  \mforall{}a,b,c,d:Point.
    (ab  \mcong{}  ac  {}\mRightarrow{}  ab  \mcong{}  ad  {}\mRightarrow{}  b  \mneq{}  c  {}\mRightarrow{}  c  \mneq{}  d  {}\mRightarrow{}  d  \mneq{}  b  {}\mRightarrow{}  (\mneg{}Colinear(b;c;d)))
By
Latex:
(Auto
  THEN  (D  0  THENA  Auto)
  THEN  InstLemma  `no-three-colinear-on-circle`  [\mkleeneopen{}e\mkleeneclose{};\mkleeneopen{}b\mkleeneclose{};\mkleeneopen{}c\mkleeneclose{};\mkleeneopen{}d\mkleeneclose{};\mkleeneopen{}a\mkleeneclose{}]\mcdot{}
  THEN  Auto)
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