Step
*
of Lemma
no-three-colinear-on-circle
∀[e:EuclideanPlane]. ∀[a:Point]. ∀[b:{b:Point| b ≠ a} ]. ∀[c:{c:Point| c ≠ a ∧ c ≠ b ∧ Colinear(a;b;c)} ].
∀p:Point. (¬(pa ≅ pb ∧ pb ≅ pc))
BY
{ (Auto THEN (D 0 THENA Auto) THEN DSetVars THEN Auto) }
1
1. e : EuclideanPlane
2. a : Point
3. b : Point
4. b ≠ a
5. c : Point
6. c ≠ a
7. c ≠ b
8. Colinear(a;b;c)
9. p : Point
10. pa ≅ pb
11. pb ≅ pc
⊢ False
Latex:
Latex:
\mforall{}[e:EuclideanPlane]. \mforall{}[a:Point]. \mforall{}[b:\{b:Point| b \mneq{} a\} ]. \mforall{}[c:\{c:Point|
c \mneq{} a \mwedge{} c \mneq{} b \mwedge{} Colinear(a;b;c)\} ].
\mforall{}p:Point. (\mneg{}(pa \mcong{} pb \mwedge{} pb \mcong{} pc))
By
Latex:
(Auto THEN (D 0 THENA Auto) THEN DSetVars THEN Auto)
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