Step
*
3
3
of Lemma
lt-angle-irrefl
1. e : EuclideanPlane
2. a : Point
3. b : Point
4. c : Point
5. x : Point
6. y : Point
7. z : Point
8. abc < xyz
9. xyz < abc
10. ¬a # bc
11. Colinear(a;b;c)
12. x # yz
13. c ≡ a
⊢ False
BY
{ (((FLemma `not-lt-zero-angle` [9] THEN Auto) THEN OrLeft THEN Auto) THEN EliminatePoint (-1) THEN Auto) }
Latex:
Latex:
1. e : EuclideanPlane
2. a : Point
3. b : Point
4. c : Point
5. x : Point
6. y : Point
7. z : Point
8. abc < xyz
9. xyz < abc
10. \mneg{}a \# bc
11. Colinear(a;b;c)
12. x \# yz
13. c \mequiv{} a
\mvdash{} False
By
Latex:
(((FLemma `not-lt-zero-angle` [9] THEN Auto) THEN OrLeft THEN Auto)
THEN EliminatePoint (-1)
THEN Auto)
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