colinbtwnle - Mathbox for Scott Fenton

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Theorem colinbtwnle 36976

Description: Given three colinear points 𝐴, 𝐵, and 𝐶, 𝐵 falls in the middle iff the two segments to 𝐵 are no longer than 𝐴𝐶. Theorem 5.12 of [Schwabhauser] p. 42. (Contributed by Scott Fenton, 15-Oct-2013.) (Revised by Mario Carneiro, 19-Apr-2014.)

**Assertion**
Ref	Expression
colinbtwnle	⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐴 Colinear ⟨𝐵, 𝐶⟩ → (𝐵 Btwn ⟨𝐴, 𝐶⟩ ↔ (⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩))))

**Proof of Theorem colinbtwnle**
Step	Hyp	Ref	Expression
1		btwnsegle 36975	. . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 Btwn ⟨𝐴, 𝐶⟩ → ⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩))
2		3anrev 1118	. . . . . . 7 ⊢ ((𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ↔ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐴 ∈ (𝔼‘𝑁)))
3		btwnsegle 36975	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐴 ∈ (𝔼‘𝑁))) → (𝐵 Btwn ⟨𝐶, 𝐴⟩ → ⟨𝐶, 𝐵⟩ Seg_≤ ⟨𝐶, 𝐴⟩))
4	2, 3	sylan2b 606	. . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 Btwn ⟨𝐶, 𝐴⟩ → ⟨𝐶, 𝐵⟩ Seg_≤ ⟨𝐶, 𝐴⟩))
5		3ancoma 1115	. . . . . . 7 ⊢ ((𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ↔ (𝐵 ∈ (𝔼‘𝑁) ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)))
6		btwncom 36872	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ ∧ (𝐵 ∈ (𝔼‘𝑁) ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 Btwn ⟨𝐴, 𝐶⟩ ↔ 𝐵 Btwn ⟨𝐶, 𝐴⟩))
7	5, 6	sylan2b 606	. . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 Btwn ⟨𝐴, 𝐶⟩ ↔ 𝐵 Btwn ⟨𝐶, 𝐴⟩))
8		simpl 488	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝑁 ∈ ℕ)
9		simpr2 1214	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐵 ∈ (𝔼‘𝑁))
10		simpr3 1215	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐶 ∈ (𝔼‘𝑁))
11	8, 9, 10	cgrrflx2d 36842	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → ⟨𝐵, 𝐶⟩Cgr⟨𝐶, 𝐵⟩)
12		simpr1 1213	. . . . . . . 8 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐴 ∈ (𝔼‘𝑁))
13	8, 12, 10	cgrrflx2d 36842	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → ⟨𝐴, 𝐶⟩Cgr⟨𝐶, 𝐴⟩)
14		seglecgr12 36969	. . . . . . . 8 ⊢ (((𝑁 ∈ ℕ ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁) ∧ 𝐴 ∈ (𝔼‘𝑁))) → ((⟨𝐵, 𝐶⟩Cgr⟨𝐶, 𝐵⟩ ∧ ⟨𝐴, 𝐶⟩Cgr⟨𝐶, 𝐴⟩) → (⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ↔ ⟨𝐶, 𝐵⟩ Seg_≤ ⟨𝐶, 𝐴⟩)))
15	8, 9, 10, 12, 10, 10, 9, 10, 12, 14	syl333anc 1429	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → ((⟨𝐵, 𝐶⟩Cgr⟨𝐶, 𝐵⟩ ∧ ⟨𝐴, 𝐶⟩Cgr⟨𝐶, 𝐴⟩) → (⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ↔ ⟨𝐶, 𝐵⟩ Seg_≤ ⟨𝐶, 𝐴⟩)))
16	11, 13, 15	mp2and 712	. . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ↔ ⟨𝐶, 𝐵⟩ Seg_≤ ⟨𝐶, 𝐴⟩))
17	4, 7, 16	3imtr4d 297	. . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 Btwn ⟨𝐴, 𝐶⟩ → ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩))
18	1, 17	jcad 522	. . . 4 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 Btwn ⟨𝐴, 𝐶⟩ → (⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)))
19	18	adantr 486	. . 3 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐴 Colinear ⟨𝐵, 𝐶⟩) → (𝐵 Btwn ⟨𝐴, 𝐶⟩ → (⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)))
20		brcolinear 36917	. . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐴 Colinear ⟨𝐵, 𝐶⟩ ↔ (𝐴 Btwn ⟨𝐵, 𝐶⟩ ∨ 𝐵 Btwn ⟨𝐶, 𝐴⟩ ∨ 𝐶 Btwn ⟨𝐴, 𝐵⟩)))
21		simprl 783	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐴 Btwn ⟨𝐵, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → 𝐴 Btwn ⟨𝐵, 𝐶⟩)
22	8, 12, 9, 10, 21	btwncomand 36873	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐴 Btwn ⟨𝐵, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → 𝐴 Btwn ⟨𝐶, 𝐵⟩)
23	16	biimpa 482	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩) → ⟨𝐶, 𝐵⟩ Seg_≤ ⟨𝐶, 𝐴⟩)
24	23	adantrl 729	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐴 Btwn ⟨𝐵, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → ⟨𝐶, 𝐵⟩ Seg_≤ ⟨𝐶, 𝐴⟩)
25		btwncom 36872	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐴 Btwn ⟨𝐵, 𝐶⟩ ↔ 𝐴 Btwn ⟨𝐶, 𝐵⟩))
26		3anrot 1117	. . . . . . . . . . . . . . . 16 ⊢ ((𝐶 ∈ (𝔼‘𝑁) ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ↔ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)))
27		btwnsegle 36975	. . . . . . . . . . . . . . . 16 ⊢ ((𝑁 ∈ ℕ ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁))) → (𝐴 Btwn ⟨𝐶, 𝐵⟩ → ⟨𝐶, 𝐴⟩ Seg_≤ ⟨𝐶, 𝐵⟩))
28	26, 27	sylan2br 607	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐴 Btwn ⟨𝐶, 𝐵⟩ → ⟨𝐶, 𝐴⟩ Seg_≤ ⟨𝐶, 𝐵⟩))
29	25, 28	sylbid 243	. . . . . . . . . . . . . 14 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐴 Btwn ⟨𝐵, 𝐶⟩ → ⟨𝐶, 𝐴⟩ Seg_≤ ⟨𝐶, 𝐵⟩))
30	29	imp 412	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐴 Btwn ⟨𝐵, 𝐶⟩) → ⟨𝐶, 𝐴⟩ Seg_≤ ⟨𝐶, 𝐵⟩)
31	30	adantrr 730	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐴 Btwn ⟨𝐵, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → ⟨𝐶, 𝐴⟩ Seg_≤ ⟨𝐶, 𝐵⟩)
32		segleantisym 36973	. . . . . . . . . . . . . 14 ⊢ ((𝑁 ∈ ℕ ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐶 ∈ (𝔼‘𝑁) ∧ 𝐴 ∈ (𝔼‘𝑁))) → ((⟨𝐶, 𝐵⟩ Seg_≤ ⟨𝐶, 𝐴⟩ ∧ ⟨𝐶, 𝐴⟩ Seg_≤ ⟨𝐶, 𝐵⟩) → ⟨𝐶, 𝐵⟩Cgr⟨𝐶, 𝐴⟩))
33	8, 10, 9, 10, 12, 32	syl122anc 1406	. . . . . . . . . . . . 13 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → ((⟨𝐶, 𝐵⟩ Seg_≤ ⟨𝐶, 𝐴⟩ ∧ ⟨𝐶, 𝐴⟩ Seg_≤ ⟨𝐶, 𝐵⟩) → ⟨𝐶, 𝐵⟩Cgr⟨𝐶, 𝐴⟩))
34	33	adantr 486	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐴 Btwn ⟨𝐵, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → ((⟨𝐶, 𝐵⟩ Seg_≤ ⟨𝐶, 𝐴⟩ ∧ ⟨𝐶, 𝐴⟩ Seg_≤ ⟨𝐶, 𝐵⟩) → ⟨𝐶, 𝐵⟩Cgr⟨𝐶, 𝐴⟩))
35	24, 31, 34	mp2and 712	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐴 Btwn ⟨𝐵, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → ⟨𝐶, 𝐵⟩Cgr⟨𝐶, 𝐴⟩)
36	8, 10, 9, 12, 22, 35	endofsegidand 36944	. . . . . . . . . 10 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐴 Btwn ⟨𝐵, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → 𝐵 = 𝐴)
37		btwntriv1 36874	. . . . . . . . . . . . 13 ⊢ ((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) → 𝐴 Btwn ⟨𝐴, 𝐶⟩)
38	37	3adant3r2 1202	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐴 Btwn ⟨𝐴, 𝐶⟩)
39		breq1 5105	. . . . . . . . . . . 12 ⊢ (𝐵 = 𝐴 → (𝐵 Btwn ⟨𝐴, 𝐶⟩ ↔ 𝐴 Btwn ⟨𝐴, 𝐶⟩))
40	38, 39	syl5ibrcom 250	. . . . . . . . . . 11 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 = 𝐴 → 𝐵 Btwn ⟨𝐴, 𝐶⟩))
41	40	adantr 486	. . . . . . . . . 10 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐴 Btwn ⟨𝐵, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → (𝐵 = 𝐴 → 𝐵 Btwn ⟨𝐴, 𝐶⟩))
42	36, 41	mpd 16	. . . . . . . . 9 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐴 Btwn ⟨𝐵, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → 𝐵 Btwn ⟨𝐴, 𝐶⟩)
43	42	expr 462	. . . . . . . 8 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐴 Btwn ⟨𝐵, 𝐶⟩) → (⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩ → 𝐵 Btwn ⟨𝐴, 𝐶⟩))
44	43	adantld 496	. . . . . . 7 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐴 Btwn ⟨𝐵, 𝐶⟩) → ((⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩) → 𝐵 Btwn ⟨𝐴, 𝐶⟩))
45	44	ex 418	. . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐴 Btwn ⟨𝐵, 𝐶⟩ → ((⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩) → 𝐵 Btwn ⟨𝐴, 𝐶⟩)))
46	7	biimprd 251	. . . . . . 7 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 Btwn ⟨𝐶, 𝐴⟩ → 𝐵 Btwn ⟨𝐴, 𝐶⟩))
47	46	a1dd 51	. . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 Btwn ⟨𝐶, 𝐴⟩ → ((⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩) → 𝐵 Btwn ⟨𝐴, 𝐶⟩)))
48		simprl 783	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐶 Btwn ⟨𝐴, 𝐵⟩ ∧ ⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → 𝐶 Btwn ⟨𝐴, 𝐵⟩)
49		simprr 785	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐶 Btwn ⟨𝐴, 𝐵⟩ ∧ ⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → ⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩)
50		3ancomb 1116	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ↔ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)))
51		btwnsegle 36975	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁))) → (𝐶 Btwn ⟨𝐴, 𝐵⟩ → ⟨𝐴, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐵⟩))
52	50, 51	sylan2b 606	. . . . . . . . . . . . . 14 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐶 Btwn ⟨𝐴, 𝐵⟩ → ⟨𝐴, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐵⟩))
53	52	imp 412	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐶 Btwn ⟨𝐴, 𝐵⟩) → ⟨𝐴, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐵⟩)
54	53	adantrr 730	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐶 Btwn ⟨𝐴, 𝐵⟩ ∧ ⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → ⟨𝐴, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐵⟩)
55		segleantisym 36973	. . . . . . . . . . . . . 14 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → ((⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐴, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐵⟩) → ⟨𝐴, 𝐵⟩Cgr⟨𝐴, 𝐶⟩))
56	8, 12, 9, 12, 10, 55	syl122anc 1406	. . . . . . . . . . . . 13 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → ((⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐴, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐵⟩) → ⟨𝐴, 𝐵⟩Cgr⟨𝐴, 𝐶⟩))
57	56	adantr 486	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐶 Btwn ⟨𝐴, 𝐵⟩ ∧ ⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → ((⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐴, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐵⟩) → ⟨𝐴, 𝐵⟩Cgr⟨𝐴, 𝐶⟩))
58	49, 54, 57	mp2and 712	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐶 Btwn ⟨𝐴, 𝐵⟩ ∧ ⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → ⟨𝐴, 𝐵⟩Cgr⟨𝐴, 𝐶⟩)
59	8, 12, 9, 10, 48, 58	endofsegidand 36944	. . . . . . . . . 10 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐶 Btwn ⟨𝐴, 𝐵⟩ ∧ ⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → 𝐵 = 𝐶)
60		btwntriv2 36870	. . . . . . . . . . . . 13 ⊢ ((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) → 𝐶 Btwn ⟨𝐴, 𝐶⟩)
61	60	3adant3r2 1202	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐶 Btwn ⟨𝐴, 𝐶⟩)
62		breq1 5105	. . . . . . . . . . . 12 ⊢ (𝐵 = 𝐶 → (𝐵 Btwn ⟨𝐴, 𝐶⟩ ↔ 𝐶 Btwn ⟨𝐴, 𝐶⟩))
63	61, 62	syl5ibrcom 250	. . . . . . . . . . 11 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 = 𝐶 → 𝐵 Btwn ⟨𝐴, 𝐶⟩))
64	63	adantr 486	. . . . . . . . . 10 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐶 Btwn ⟨𝐴, 𝐵⟩ ∧ ⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → (𝐵 = 𝐶 → 𝐵 Btwn ⟨𝐴, 𝐶⟩))
65	59, 64	mpd 16	. . . . . . . . 9 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ (𝐶 Btwn ⟨𝐴, 𝐵⟩ ∧ ⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩)) → 𝐵 Btwn ⟨𝐴, 𝐶⟩)
66	65	expr 462	. . . . . . . 8 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐶 Btwn ⟨𝐴, 𝐵⟩) → (⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ → 𝐵 Btwn ⟨𝐴, 𝐶⟩))
67	66	adantrd 497	. . . . . . 7 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐶 Btwn ⟨𝐴, 𝐵⟩) → ((⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩) → 𝐵 Btwn ⟨𝐴, 𝐶⟩))
68	67	ex 418	. . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐶 Btwn ⟨𝐴, 𝐵⟩ → ((⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩) → 𝐵 Btwn ⟨𝐴, 𝐶⟩)))
69	45, 47, 68	3jaod 1456	. . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → ((𝐴 Btwn ⟨𝐵, 𝐶⟩ ∨ 𝐵 Btwn ⟨𝐶, 𝐴⟩ ∨ 𝐶 Btwn ⟨𝐴, 𝐵⟩) → ((⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩) → 𝐵 Btwn ⟨𝐴, 𝐶⟩)))
70	20, 69	sylbid 243	. . . 4 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐴 Colinear ⟨𝐵, 𝐶⟩ → ((⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩) → 𝐵 Btwn ⟨𝐴, 𝐶⟩)))
71	70	imp 412	. . 3 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐴 Colinear ⟨𝐵, 𝐶⟩) → ((⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩) → 𝐵 Btwn ⟨𝐴, 𝐶⟩))
72	19, 71	impbid 215	. 2 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐴 Colinear ⟨𝐵, 𝐶⟩) → (𝐵 Btwn ⟨𝐴, 𝐶⟩ ↔ (⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩)))
73	72	ex 418	1 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐴 Colinear ⟨𝐵, 𝐶⟩ → (𝐵 Btwn ⟨𝐴, 𝐶⟩ ↔ (⟨𝐴, 𝐵⟩ Seg_≤ ⟨𝐴, 𝐶⟩ ∧ ⟨𝐵, 𝐶⟩ Seg_≤ ⟨𝐴, 𝐶⟩))))

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∨ w3o 1102 ∧ w3a 1103 = wceq 1569 ∈ wcel 2144 ⟨cop 4834 class class class wbr 5102 ‘cfv 6539 ℕcn 12339 𝔼cee 29471 Btwn cbtwn 29472 Cgrccgr 29473 Colinear ccolin 36895 Seg_≤ csegle 36964

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7752 ax-inf2 9646 ax-cnex 11260 ax-resscn 11261 ax-1cn 11262 ax-icn 11263 ax-addcl 11264 ax-addrcl 11265 ax-mulcl 11266 ax-mulrcl 11267 ax-mulcom 11268 ax-addass 11269 ax-mulass 11270 ax-distr 11271 ax-i2m1 11272 ax-1ne0 11273 ax-1rid 11274 ax-rnegex 11275 ax-rrecex 11276 ax-cnre 11277 ax-pre-lttri 11278 ax-pre-lttrn 11279 ax-pre-ltadd 11280 ax-pre-mulgt0 11281 ax-pre-sup 11282

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-int 4907 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-se 5604 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-isom 6548 df-riota 7378 df-ov 7424 df-oprab 7425 df-mpo 7426 df-om 7879 df-1st 8002 df-2nd 8003 df-frecs 8303 df-wrecs 8334 df-recs 8383 df-rdg 8422 df-1o 8480 df-er 8721 df-map 8853 df-en 8978 df-dom 8979 df-sdom 8980 df-fin 8981 df-sup 9438 df-oi 9508 df-card 10024 df-pnf 11349 df-mnf 11350 df-xr 11351 df-ltxr 11352 df-le 11353 df-sub 11547 df-neg 11548 df-div 11978 df-nn 12340 df-2 12409 df-3 12410 df-n0 12611 df-z 12698 df-uz 12970 df-rp 13125 df-ico 13486 df-icc 13487 df-fz 13644 df-fzo 13793 df-seq 14149 df-exp 14209 df-hash 14479 df-cj 15272 df-re 15273 df-im 15274 df-sqrt 15408 df-abs 15409 df-clim 15661 df-sum 15860 df-ee 29474 df-btwn 29475 df-cgr 29476 df-ofs 36841 df-colinear 36897 df-ifs 36898 df-cgr3 36899 df-segle 36965

This theorem is used by: (None)

W3C validator