Step * 1 of Lemma geo-perp-trivial-when-colinear


1. EuclideanPlane
2. Point
3. Point
4. Point
5. Point
6. b ≠ a
7. Colinear(a;b;c)
8. ab  ⊥dc
9. d ≠ c
⊢ False
BY
(InstLemma `perp-col` [⌜e⌝;⌜a⌝;⌜b⌝;⌜c⌝;⌜d⌝;⌜d⌝;⌜c⌝]⋅ THENA (Auto THEN EasyGeometry)) }

1
1. EuclideanPlane
2. Point
3. Point
4. Point
5. Point
6. b ≠ a
7. Colinear(a;b;c)
8. ab  ⊥dc
9. d ≠ c
10. cd  ⊥dc
⊢ False


Latex:


Latex:

1.  e  :  EuclideanPlane
2.  a  :  Point
3.  b  :  Point
4.  c  :  Point
5.  d  :  Point
6.  b  \mneq{}  a
7.  Colinear(a;b;c)
8.  ab    \mbot{}d  dc
9.  d  \mneq{}  c
\mvdash{}  False


By


Latex:
(InstLemma  `perp-col`  [\mkleeneopen{}e\mkleeneclose{};\mkleeneopen{}a\mkleeneclose{};\mkleeneopen{}b\mkleeneclose{};\mkleeneopen{}c\mkleeneclose{};\mkleeneopen{}d\mkleeneclose{};\mkleeneopen{}d\mkleeneclose{};\mkleeneopen{}c\mkleeneclose{}]\mcdot{}  THENA  (Auto  THEN  EasyGeometry))




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