btwnconn1lem2

Description: Lemma for btwnconn1 . Now, we show that two of the hypotheticals we introduced in the first lemma are identical. (Contributed by Scott Fenton, 8-Oct-2013)

		Ref	Expression
	Assertion	btwnconn1lem2	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to X = b$

Proof

Step	Hyp	Ref	Expression
1		simp1ll	$⊢ (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩))) \to A \neq B$
2	1	adantl	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to A \neq B$
3		simp11	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to N \in ℕ$
4		simp12	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to A \in 𝔼 (N)$
5		simp13	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to B \in 𝔼 (N)$
6		simp21	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to C \in 𝔼 (N)$
7		simp33	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to X \in 𝔼 (N)$
8		simp1rl	$⊢ (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩))) \to B Btwn ⟨A, C⟩$
9	8	adantl	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to B Btwn ⟨A, C⟩$
10		simp2rl	$⊢ (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩))) \to C Btwn ⟨A, d⟩$
11		simp3rl	$⊢ (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩))) \to d Btwn ⟨A, X⟩$
12	10 11	jca	$⊢ (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩))) \to (C Btwn ⟨A, d⟩ \land d Btwn ⟨A, X⟩)$
13	12	adantl	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to (C Btwn ⟨A, d⟩ \land d Btwn ⟨A, X⟩)$
14		simp31	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to d \in 𝔼 (N)$
15		btwnexch	$⊢ (N \in ℕ \land (A \in 𝔼 (N) \land C \in 𝔼 (N)) \land (d \in 𝔼 (N) \land X \in 𝔼 (N))) \to ((C Btwn ⟨A, d⟩ \land d Btwn ⟨A, X⟩) \to C Btwn ⟨A, X⟩)$
16	3 4 6 14 7 15	syl122anc	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to ((C Btwn ⟨A, d⟩ \land d Btwn ⟨A, X⟩) \to C Btwn ⟨A, X⟩)$
17	16	adantr	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to ((C Btwn ⟨A, d⟩ \land d Btwn ⟨A, X⟩) \to C Btwn ⟨A, X⟩)$
18	13 17	mpd	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to C Btwn ⟨A, X⟩$
19	3 4 5 6 7 9 18	btwnexchand	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to B Btwn ⟨A, X⟩$
20	3 5 7	cgrrflx2d	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to ⟨B, X⟩ Cgr ⟨X, B⟩$
21	20	adantr	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to ⟨B, X⟩ Cgr ⟨X, B⟩$
22	19 21	jca	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to (B Btwn ⟨A, X⟩ \land ⟨B, X⟩ Cgr ⟨X, B⟩)$
23		simp23	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to c \in 𝔼 (N)$
24		simp32	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to b \in 𝔼 (N)$
25		simp1rr	$⊢ (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩))) \to B Btwn ⟨A, D⟩$
26		simp2ll	$⊢ (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩))) \to D Btwn ⟨A, c⟩$
27	25 26	jca	$⊢ (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩))) \to (B Btwn ⟨A, D⟩ \land D Btwn ⟨A, c⟩)$
28	27	adantl	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to (B Btwn ⟨A, D⟩ \land D Btwn ⟨A, c⟩)$
29		simp22	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to D \in 𝔼 (N)$
30		btwnexch	$⊢ (N \in ℕ \land (A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (D \in 𝔼 (N) \land c \in 𝔼 (N))) \to ((B Btwn ⟨A, D⟩ \land D Btwn ⟨A, c⟩) \to B Btwn ⟨A, c⟩)$
31	3 4 5 29 23 30	syl122anc	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to ((B Btwn ⟨A, D⟩ \land D Btwn ⟨A, c⟩) \to B Btwn ⟨A, c⟩)$
32	31	adantr	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to ((B Btwn ⟨A, D⟩ \land D Btwn ⟨A, c⟩) \to B Btwn ⟨A, c⟩)$
33	28 32	mpd	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to B Btwn ⟨A, c⟩$
34		simp3ll	$⊢ (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩))) \to c Btwn ⟨A, b⟩$
35	34	adantl	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to c Btwn ⟨A, b⟩$
36	3 4 5 23 24 33 35	btwnexchand	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to B Btwn ⟨A, b⟩$
37	3 4 5 23 24 33 35	btwnexch3and	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to c Btwn ⟨B, b⟩$
38	3 4 5 6 7 9 18	btwnexch3and	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to C Btwn ⟨B, X⟩$
39	3 6 5 7 38	btwncomand	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to C Btwn ⟨X, B⟩$
40		btwnconn1lem1	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to ⟨B, c⟩ Cgr ⟨X, C⟩$
41		simp3lr	$⊢ (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩))) \to ⟨c, b⟩ Cgr ⟨C, B⟩$
42	41	adantl	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to ⟨c, b⟩ Cgr ⟨C, B⟩$
43	3 5 23 24 7 6 5 37 39 40 42	cgrextendand	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to ⟨B, b⟩ Cgr ⟨X, B⟩$
44	36 43	jca	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to (B Btwn ⟨A, b⟩ \land ⟨B, b⟩ Cgr ⟨X, B⟩)$
45		segconeq	$⊢ (N \in ℕ \land (B \in 𝔼 (N) \land X \in 𝔼 (N) \land B \in 𝔼 (N)) \land (A \in 𝔼 (N) \land X \in 𝔼 (N) \land b \in 𝔼 (N))) \to ((A \neq B \land (B Btwn ⟨A, X⟩ \land ⟨B, X⟩ Cgr ⟨X, B⟩) \land (B Btwn ⟨A, b⟩ \land ⟨B, b⟩ Cgr ⟨X, B⟩)) \to X = b)$
46	3 5 7 5 4 7 24 45	syl133anc	$⊢ ((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \to ((A \neq B \land (B Btwn ⟨A, X⟩ \land ⟨B, X⟩ Cgr ⟨X, B⟩) \land (B Btwn ⟨A, b⟩ \land ⟨B, b⟩ Cgr ⟨X, B⟩)) \to X = b)$
47	46	adantr	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to ((A \neq B \land (B Btwn ⟨A, X⟩ \land ⟨B, X⟩ Cgr ⟨X, B⟩) \land (B Btwn ⟨A, b⟩ \land ⟨B, b⟩ Cgr ⟨X, B⟩)) \to X = b)$
48	2 22 44 47	mp3and	$⊢ (((N \in ℕ \land A \in 𝔼 (N) \land B \in 𝔼 (N)) \land (C \in 𝔼 (N) \land D \in 𝔼 (N) \land c \in 𝔼 (N)) \land (d \in 𝔼 (N) \land b \in 𝔼 (N) \land X \in 𝔼 (N))) \land (((A \neq B \land B \neq C) \land (B Btwn ⟨A, C⟩ \land B Btwn ⟨A, D⟩)) \land ((D Btwn ⟨A, c⟩ \land ⟨D, c⟩ Cgr ⟨C, D⟩) \land (C Btwn ⟨A, d⟩ \land ⟨C, d⟩ Cgr ⟨C, D⟩)) \land ((c Btwn ⟨A, b⟩ \land ⟨c, b⟩ Cgr ⟨C, B⟩) \land (d Btwn ⟨A, X⟩ \land ⟨d, X⟩ Cgr ⟨D, B⟩)))) \to X = b$

Metamath Proof Explorer

Theorem btwnconn1lem2

Proof