Step * 1 2 of Lemma not-dist-cong


1. EuclideanPlane
2. Point
3. Point
4. Point
5. Point
6. ¬D(a;b;b;b;c;d)
7. ¬D(c;d;d;d;a;b)
8. ¬ab > cd
9. ¬cd > ab
10. ¬(|ab| < |cd| ∨ |cd| < |ab| ∨ (|ab| |cd| ∈ Length))
⊢ ab ≅ cd
BY
(InstLemma `not-lt-or` [⌜g⌝;⌜|ab|⌝;⌜|cd|⌝]⋅ THEN Auto) }


Latex:


Latex:

1.  g  :  EuclideanPlane
2.  a  :  Point
3.  b  :  Point
4.  c  :  Point
5.  d  :  Point
6.  \mneg{}D(a;b;b;b;c;d)
7.  \mneg{}D(c;d;d;d;a;b)
8.  \mneg{}ab  >  cd
9.  \mneg{}cd  >  ab
10.  \mneg{}(|ab|  <  |cd|  \mvee{}  |cd|  <  |ab|  \mvee{}  (|ab|  =  |cd|))
\mvdash{}  ab  \mcong{}  cd


By


Latex:
(InstLemma  `not-lt-or`  [\mkleeneopen{}g\mkleeneclose{};\mkleeneopen{}|ab|\mkleeneclose{};\mkleeneopen{}|cd|\mkleeneclose{}]\mcdot{}  THEN  Auto)




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