Step
*
1
1
of Lemma
tarski-erect-perp-same-side2
1. e : HeytingGeometry
2. a : Point
3. b : Point
4. c : Point
5. c # ba
6. x : Point
7. Colinear(a;b;x)
8. ab ⊥x cx
9. a # x
10. c1 : Point
11. c' : Point
12. p : Point
13. c=a=c1
14. c=x=c'
15. c'a ≅ ca
16. c' # c1a
17. a # cc'
18. c1=p=c'
19. ab ⊥a pa
20. p # ab
21. c' # c1
22. c # x
23. c' # x
24. c1 # p
25. c' # p
26. c # c1
27. c # c'c1
⊢ ∃p,t,d:Point. ((((ab ⊥ pa ∧ Colinear(a;b;t)) ∧ p-t-d) ∧ geo-tar-same-side(e;c;d;a;b)) ∧ p # ba)
BY
{ ((InstLemma `double-pasch-exists` [⌜e⌝;⌜c'⌝;⌜x⌝;⌜c⌝;⌜c1⌝;⌜a⌝;⌜p⌝]⋅
THENA (Auto THEN ∀h:hyp. (Unfold `geo-midpoint` h THEN Auto) THEN D 0 THEN Auto)
)
THEN (((ExRepD THEN InstConcl [⌜p⌝;⌜q⌝;⌜c⌝]⋅) THENA Auto) THEN GenRepD ⋅)
THEN Auto) }
1
1. e : HeytingGeometry
2. a : Point
3. b : Point
4. c : Point
5. c # ba
6. x : Point
7. Colinear(a;b;x)
8. ab ⊥x cx
9. a # x
10. c1 : Point
11. c' : Point
12. p : Point
13. c=a=c1
14. c=x=c'
15. c'a ≅ ca
16. c' # c1a
17. a # cc'
18. c1=p=c'
19. ab ⊥a pa
20. p # ab
21. c' # c1
22. c # x
23. c' # x
24. c1 # p
25. c' # p
26. c # c1
27. c # c'c1
28. q : Point
29. p-q-c
30. x-q-a
⊢ ab ⊥ pa
2
1. e : HeytingGeometry
2. a : Point
3. b : Point
4. c : Point
5. c # ba
6. x : Point
7. Colinear(a;b;x)
8. ab ⊥x cx
9. a # x
10. c1 : Point
11. c' : Point
12. p : Point
13. c=a=c1
14. c=x=c'
15. c'a ≅ ca
16. c' # c1a
17. a # cc'
18. c1=p=c'
19. ab ⊥a pa
20. p # ab
21. c' # c1
22. c # x
23. c' # x
24. c1 # p
25. c' # p
26. c # c1
27. c # c'c1
28. q : Point
29. p-q-c
30. x-q-a
⊢ geo-tar-same-side(e;c;c;a;b)
Latex:
Latex:
1. e : HeytingGeometry
2. a : Point
3. b : Point
4. c : Point
5. c \# ba
6. x : Point
7. Colinear(a;b;x)
8. ab \mbot{}x cx
9. a \# x
10. c1 : Point
11. c' : Point
12. p : Point
13. c=a=c1
14. c=x=c'
15. c'a \mcong{} ca
16. c' \# c1a
17. a \# cc'
18. c1=p=c'
19. ab \mbot{}a pa
20. p \# ab
21. c' \# c1
22. c \# x
23. c' \# x
24. c1 \# p
25. c' \# p
26. c \# c1
27. c \# c'c1
\mvdash{} \mexists{}p,t,d:Point. ((((ab \mbot{} pa \mwedge{} Colinear(a;b;t)) \mwedge{} p-t-d) \mwedge{} geo-tar-same-side(e;c;d;a;b)) \mwedge{} p \# ba)
By
Latex:
((InstLemma `double-pasch-exists` [\mkleeneopen{}e\mkleeneclose{};\mkleeneopen{}c'\mkleeneclose{};\mkleeneopen{}x\mkleeneclose{};\mkleeneopen{}c\mkleeneclose{};\mkleeneopen{}c1\mkleeneclose{};\mkleeneopen{}a\mkleeneclose{};\mkleeneopen{}p\mkleeneclose{}]\mcdot{}
THENA (Auto THEN \mforall{}h:hyp. (Unfold `geo-midpoint` h THEN Auto) THEN D 0 THEN Auto)
)
THEN (((ExRepD THEN InstConcl [\mkleeneopen{}p\mkleeneclose{};\mkleeneopen{}q\mkleeneclose{};\mkleeneopen{}c\mkleeneclose{}]\mcdot{}) THENA Auto) THEN GenRepD \mcdot{})
THEN Auto)
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