Step * of Lemma geo-perp-in-same-colinear

[e:BasicGeometry]. ∀[a,b,c,d,x:Point].  (Colinear(x;c;d)) supposing (ab  ⊥xc and ab  ⊥xd)
BY
(Auto THEN (gSeparatedCases ⌜a⌝ ⌜b⌝⋅ THENA Auto)) }

1
1. BasicGeometry
2. Point
3. Point
4. Point
5. Point
6. Point
7. ab  ⊥xd
8. ab  ⊥xc
9. a ≠ b
⊢ Colinear(x;c;d)

2
1. BasicGeometry
2. Point
3. Point
4. Point
5. Point
6. Point
7. bb  ⊥xd
8. bb  ⊥xc
9. a ≡ b
⊢ Colinear(x;c;d)


Latex:


Latex:
\mforall{}[e:BasicGeometry].  \mforall{}[a,b,c,d,x:Point].    (Colinear(x;c;d))  supposing  (ab    \mbot{}x  xc  and  ab    \mbot{}x  xd)


By


Latex:
(Auto  THEN  (gSeparatedCases  \mkleeneopen{}a\mkleeneclose{}  \mkleeneopen{}b\mkleeneclose{}\mcdot{}  THENA  Auto))




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