Step
*
1
3
3
of Lemma
interior-implies-lt-angle
1. e : EuclideanPlane
2. a : Point
3. b : Point
4. c : Point
5. x : Point
6. y : Point
7. z : Point
8. x # yz
9. c leftof ba
10. f : Point
11. f leftof ba
12. f leftof cb
13. abf ≅a xyz
14. x1 : Point
15. Colinear(f;b;x1)
16. B(ax1c)
17. xyz ≅a abx1
18. B(bx1x1)
19. out(b aa)
20. out(b cc)
21. ¬B(abx1)
22. B(ax1c)
⊢ x1 # c
BY
{ ((Assert c # bf BY Auto) THEN InstLemma `lsep-iff-all-sep` [⌜e⌝;⌜c⌝;⌜b⌝;⌜f⌝]⋅ THEN EAuto 2) }
Latex:
Latex:
1. e : EuclideanPlane
2. a : Point
3. b : Point
4. c : Point
5. x : Point
6. y : Point
7. z : Point
8. x \# yz
9. c leftof ba
10. f : Point
11. f leftof ba
12. f leftof cb
13. abf \mcong{}\msuba{} xyz
14. x1 : Point
15. Colinear(f;b;x1)
16. B(ax1c)
17. xyz \mcong{}\msuba{} abx1
18. B(bx1x1)
19. out(b aa)
20. out(b cc)
21. \mneg{}B(abx1)
22. B(ax1c)
\mvdash{} x1 \# c
By
Latex:
((Assert c \# bf BY Auto) THEN InstLemma `lsep-iff-all-sep` [\mkleeneopen{}e\mkleeneclose{};\mkleeneopen{}c\mkleeneclose{};\mkleeneopen{}b\mkleeneclose{};\mkleeneopen{}f\mkleeneclose{}]\mcdot{} THEN EAuto 2)
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