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Theorem angpieqvd 26718

Description: The angle ABC is π iff 𝐵 is a nontrivial convex combination of 𝐴 and 𝐶, i.e., iff 𝐵 is in the interior of the segment AC. (Contributed by David Moews, 28-Feb-2017.)

**Hypotheses**
Ref	Expression
angpieqvd.angdef	⊢ 𝐹 = (𝑥 ∈ (ℂ ∖ {0}), 𝑦 ∈ (ℂ ∖ {0}) ↦ (ℑ‘(log‘(𝑦 / 𝑥))))
angpieqvd.A	⊢ (𝜑 → 𝐴 ∈ ℂ)
angpieqvd.B	⊢ (𝜑 → 𝐵 ∈ ℂ)
angpieqvd.C	⊢ (𝜑 → 𝐶 ∈ ℂ)
angpieqvd.AneB	⊢ (𝜑 → 𝐴 ≠ 𝐵)
angpieqvd.BneC	⊢ (𝜑 → 𝐵 ≠ 𝐶)

**Assertion**
Ref	Expression
angpieqvd	⊢ (𝜑 → (((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π ↔ ∃𝑤 ∈ (0(,)1)𝐵 = ((𝑤 · 𝐴) + ((1 − 𝑤) · 𝐶))))

Distinct variable groups: 𝑥,𝑦,𝐴 𝑥,𝐵,𝑦 𝑥,𝐶,𝑦 𝑤,𝐹 𝜑,𝑤 𝑤,𝐴 𝑤,𝐵 𝑤,𝐶 Allowed substitution hints: 𝜑(𝑥,𝑦) 𝐹(𝑥,𝑦)

**Proof of Theorem angpieqvd**
Step	Hyp	Ref	Expression
1		angpieqvd.angdef	. . . . . . 7 ⊢ 𝐹 = (𝑥 ∈ (ℂ ∖ {0}), 𝑦 ∈ (ℂ ∖ {0}) ↦ (ℑ‘(log‘(𝑦 / 𝑥))))
2		angpieqvd.A	. . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ ℂ)
3		angpieqvd.B	. . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℂ)
4		angpieqvd.C	. . . . . . 7 ⊢ (𝜑 → 𝐶 ∈ ℂ)
5		angpieqvd.AneB	. . . . . . 7 ⊢ (𝜑 → 𝐴 ≠ 𝐵)
6		angpieqvd.BneC	. . . . . . 7 ⊢ (𝜑 → 𝐵 ≠ 𝐶)
7	1, 2, 3, 4, 5, 6	angpieqvdlem2 26716	. . . . . 6 ⊢ (𝜑 → (-((𝐶 − 𝐵) / (𝐴 − 𝐵)) ∈ ℝ⁺ ↔ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π))
8	7	biimpar 477	. . . . 5 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → -((𝐶 − 𝐵) / (𝐴 − 𝐵)) ∈ ℝ⁺)
9	2	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐴 ∈ ℂ)
10	3	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐵 ∈ ℂ)
11	4	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐶 ∈ ℂ)
12	5	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐴 ≠ 𝐵)
13	1, 2, 3, 4, 5, 6	angpined 26717	. . . . . . 7 ⊢ (𝜑 → (((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π → 𝐴 ≠ 𝐶))
14	13	imp 406	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐴 ≠ 𝐶)
15	9, 10, 11, 12, 14	angpieqvdlem 26715	. . . . 5 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (-((𝐶 − 𝐵) / (𝐴 − 𝐵)) ∈ ℝ⁺ ↔ ((𝐶 − 𝐵) / (𝐶 − 𝐴)) ∈ (0(,)1)))
16	8, 15	mpbid 231	. . . 4 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → ((𝐶 − 𝐵) / (𝐶 − 𝐴)) ∈ (0(,)1))
17	4, 3	subcld 11575	. . . . . . . 8 ⊢ (𝜑 → (𝐶 − 𝐵) ∈ ℂ)
18	17	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (𝐶 − 𝐵) ∈ ℂ)
19	4, 2	subcld 11575	. . . . . . . 8 ⊢ (𝜑 → (𝐶 − 𝐴) ∈ ℂ)
20	19	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (𝐶 − 𝐴) ∈ ℂ)
21	14	necomd 2990	. . . . . . . 8 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐶 ≠ 𝐴)
22	11, 9, 21	subne0d 11584	. . . . . . 7 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (𝐶 − 𝐴) ≠ 0)
23	18, 20, 22	divcan1d 11995	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (((𝐶 − 𝐵) / (𝐶 − 𝐴)) · (𝐶 − 𝐴)) = (𝐶 − 𝐵))
24	23	eqcomd 2732	. . . . 5 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (𝐶 − 𝐵) = (((𝐶 − 𝐵) / (𝐶 − 𝐴)) · (𝐶 − 𝐴)))
25	18, 20, 22	divcld 11994	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → ((𝐶 − 𝐵) / (𝐶 − 𝐴)) ∈ ℂ)
26	9, 10, 11, 25	affineequiv 26710	. . . . 5 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (𝐵 = ((((𝐶 − 𝐵) / (𝐶 − 𝐴)) · 𝐴) + ((1 − ((𝐶 − 𝐵) / (𝐶 − 𝐴))) · 𝐶)) ↔ (𝐶 − 𝐵) = (((𝐶 − 𝐵) / (𝐶 − 𝐴)) · (𝐶 − 𝐴))))
27	24, 26	mpbird 257	. . . 4 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐵 = ((((𝐶 − 𝐵) / (𝐶 − 𝐴)) · 𝐴) + ((1 − ((𝐶 − 𝐵) / (𝐶 − 𝐴))) · 𝐶)))
28		oveq1 7412	. . . . . 6 ⊢ (𝑤 = ((𝐶 − 𝐵) / (𝐶 − 𝐴)) → (𝑤 · 𝐴) = (((𝐶 − 𝐵) / (𝐶 − 𝐴)) · 𝐴))
29		oveq2 7413	. . . . . . 7 ⊢ (𝑤 = ((𝐶 − 𝐵) / (𝐶 − 𝐴)) → (1 − 𝑤) = (1 − ((𝐶 − 𝐵) / (𝐶 − 𝐴))))
30	29	oveq1d 7420	. . . . . 6 ⊢ (𝑤 = ((𝐶 − 𝐵) / (𝐶 − 𝐴)) → ((1 − 𝑤) · 𝐶) = ((1 − ((𝐶 − 𝐵) / (𝐶 − 𝐴))) · 𝐶))
31	28, 30	oveq12d 7423	. . . . 5 ⊢ (𝑤 = ((𝐶 − 𝐵) / (𝐶 − 𝐴)) → ((𝑤 · 𝐴) + ((1 − 𝑤) · 𝐶)) = ((((𝐶 − 𝐵) / (𝐶 − 𝐴)) · 𝐴) + ((1 − ((𝐶 − 𝐵) / (𝐶 − 𝐴))) · 𝐶)))
32	31	rspceeqv 3628	. . . 4 ⊢ ((((𝐶 − 𝐵) / (𝐶 − 𝐴)) ∈ (0(,)1) ∧ 𝐵 = ((((𝐶 − 𝐵) / (𝐶 − 𝐴)) · 𝐴) + ((1 − ((𝐶 − 𝐵) / (𝐶 − 𝐴))) · 𝐶))) → ∃𝑤 ∈ (0(,)1)𝐵 = ((𝑤 · 𝐴) + ((1 − 𝑤) · 𝐶)))
33	16, 27, 32	syl2anc 583	. . 3 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → ∃𝑤 ∈ (0(,)1)𝐵 = ((𝑤 · 𝐴) + ((1 − 𝑤) · 𝐶)))
34	33	ex 412	. 2 ⊢ (𝜑 → (((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π → ∃𝑤 ∈ (0(,)1)𝐵 = ((𝑤 · 𝐴) + ((1 − 𝑤) · 𝐶))))
35	2	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → 𝐴 ∈ ℂ)
36	3	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → 𝐵 ∈ ℂ)
37	4	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → 𝐶 ∈ ℂ)
38		simpr 484	. . . . . 6 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → 𝑤 ∈ (0(,)1))
39		elioore 13360	. . . . . 6 ⊢ (𝑤 ∈ (0(,)1) → 𝑤 ∈ ℝ)
40		recn 11202	. . . . . 6 ⊢ (𝑤 ∈ ℝ → 𝑤 ∈ ℂ)
41	38, 39, 40	3syl 18	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → 𝑤 ∈ ℂ)
42	35, 36, 37, 41	affineequiv 26710	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → (𝐵 = ((𝑤 · 𝐴) + ((1 − 𝑤) · 𝐶)) ↔ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))))
43		simp3 1135	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴)))
44	17	3ad2ant1 1130	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (𝐶 − 𝐵) ∈ ℂ)
45	41	3adant3 1129	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → 𝑤 ∈ ℂ)
46	19	3ad2ant1 1130	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (𝐶 − 𝐴) ∈ ℂ)
47	6	necomd 2990	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝐶 ≠ 𝐵)
48	4, 3, 47	subne0d 11584	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝐶 − 𝐵) ≠ 0)
49	48	3ad2ant1 1130	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (𝐶 − 𝐵) ≠ 0)
50	43, 49	eqnetrrd 3003	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (𝑤 · (𝐶 − 𝐴)) ≠ 0)
51	45, 46, 50	mulne0bbd 11874	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (𝐶 − 𝐴) ≠ 0)
52	44, 45, 46, 51	divmul3d 12028	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (((𝐶 − 𝐵) / (𝐶 − 𝐴)) = 𝑤 ↔ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))))
53	43, 52	mpbird 257	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → ((𝐶 − 𝐵) / (𝐶 − 𝐴)) = 𝑤)
54		simp2 1134	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → 𝑤 ∈ (0(,)1))
55	53, 54	eqeltrd 2827	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → ((𝐶 − 𝐵) / (𝐶 − 𝐴)) ∈ (0(,)1))
56	2	3ad2ant1 1130	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → 𝐴 ∈ ℂ)
57	3	3ad2ant1 1130	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → 𝐵 ∈ ℂ)
58	4	3ad2ant1 1130	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → 𝐶 ∈ ℂ)
59	5	3ad2ant1 1130	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → 𝐴 ≠ 𝐵)
60	58, 56, 51	subne0ad 11586	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → 𝐶 ≠ 𝐴)
61	60	necomd 2990	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → 𝐴 ≠ 𝐶)
62	56, 57, 58, 59, 61	angpieqvdlem 26715	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (-((𝐶 − 𝐵) / (𝐴 − 𝐵)) ∈ ℝ⁺ ↔ ((𝐶 − 𝐵) / (𝐶 − 𝐴)) ∈ (0(,)1)))
63	55, 62	mpbird 257	. . . . . 6 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → -((𝐶 − 𝐵) / (𝐴 − 𝐵)) ∈ ℝ⁺)
64	6	3ad2ant1 1130	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → 𝐵 ≠ 𝐶)
65	1, 56, 57, 58, 59, 64	angpieqvdlem2 26716	. . . . . 6 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (-((𝐶 − 𝐵) / (𝐴 − 𝐵)) ∈ ℝ⁺ ↔ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π))
66	63, 65	mpbid 231	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π)
67	66	3expia 1118	. . . 4 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → ((𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴)) → ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π))
68	42, 67	sylbid 239	. . 3 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → (𝐵 = ((𝑤 · 𝐴) + ((1 − 𝑤) · 𝐶)) → ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π))
69	68	rexlimdva 3149	. 2 ⊢ (𝜑 → (∃𝑤 ∈ (0(,)1)𝐵 = ((𝑤 · 𝐴) + ((1 − 𝑤) · 𝐶)) → ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π))
70	34, 69	impbid 211	1 ⊢ (𝜑 → (((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π ↔ ∃𝑤 ∈ (0(,)1)𝐵 = ((𝑤 · 𝐴) + ((1 − 𝑤) · 𝐶))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2934 ∃wrex 3064 ∖ cdif 3940 {csn 4623 ‘cfv 6537 (class class class)co 7405 ∈ cmpo 7407 ℂcc 11110 ℝcr 11111 0cc0 11112 1c1 11113 + caddc 11115 · cmul 11117 − cmin 11448 -cneg 11449 / cdiv 11875 ℝ⁺crp 12980 (,)cioo 13330 ℑcim 15051 πcpi 16016 logclog 26443

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-rep 5278 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7722 ax-inf2 9638 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 ax-pre-sup 11190 ax-addf 11191

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-nel 3041 df-ral 3056 df-rex 3065 df-rmo 3370 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-pss 3962 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-tp 4628 df-op 4630 df-uni 4903 df-int 4944 df-iun 4992 df-iin 4993 df-br 5142 df-opab 5204 df-mpt 5225 df-tr 5259 df-id 5567 df-eprel 5573 df-po 5581 df-so 5582 df-fr 5624 df-se 5625 df-we 5626 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-pred 6294 df-ord 6361 df-on 6362 df-lim 6363 df-suc 6364 df-iota 6489 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-isom 6546 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-of 7667 df-om 7853 df-1st 7974 df-2nd 7975 df-supp 8147 df-frecs 8267 df-wrecs 8298 df-recs 8372 df-rdg 8411 df-1o 8467 df-2o 8468 df-er 8705 df-map 8824 df-pm 8825 df-ixp 8894 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-fsupp 9364 df-fi 9408 df-sup 9439 df-inf 9440 df-oi 9507 df-card 9936 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-div 11876 df-nn 12217 df-2 12279 df-3 12280 df-4 12281 df-5 12282 df-6 12283 df-7 12284 df-8 12285 df-9 12286 df-n0 12477 df-z 12563 df-dec 12682 df-uz 12827 df-q 12937 df-rp 12981 df-xneg 13098 df-xadd 13099 df-xmul 13100 df-ioo 13334 df-ioc 13335 df-ico 13336 df-icc 13337 df-fz 13491 df-fzo 13634 df-fl 13763 df-mod 13841 df-seq 13973 df-exp 14033 df-fac 14239 df-bc 14268 df-hash 14296 df-shft 15020 df-cj 15052 df-re 15053 df-im 15054 df-sqrt 15188 df-abs 15189 df-limsup 15421 df-clim 15438 df-rlim 15439 df-sum 15639 df-ef 16017 df-sin 16019 df-cos 16020 df-pi 16022 df-struct 17089 df-sets 17106 df-slot 17124 df-ndx 17136 df-base 17154 df-ress 17183 df-plusg 17219 df-mulr 17220 df-starv 17221 df-sca 17222 df-vsca 17223 df-ip 17224 df-tset 17225 df-ple 17226 df-ds 17228 df-unif 17229 df-hom 17230 df-cco 17231 df-rest 17377 df-topn 17378 df-0g 17396 df-gsum 17397 df-topgen 17398 df-pt 17399 df-prds 17402 df-xrs 17457 df-qtop 17462 df-imas 17463 df-xps 17465 df-mre 17539 df-mrc 17540 df-acs 17542 df-mgm 18573 df-sgrp 18652 df-mnd 18668 df-submnd 18714 df-mulg 18996 df-cntz 19233 df-cmn 19702 df-psmet 21232 df-xmet 21233 df-met 21234 df-bl 21235 df-mopn 21236 df-fbas 21237 df-fg 21238 df-cnfld 21241 df-top 22751 df-topon 22768 df-topsp 22790 df-bases 22804 df-cld 22878 df-ntr 22879 df-cls 22880 df-nei 22957 df-lp 22995 df-perf 22996 df-cn 23086 df-cnp 23087 df-haus 23174 df-tx 23421 df-hmeo 23614 df-fil 23705 df-fm 23797 df-flim 23798 df-flf 23799 df-xms 24181 df-ms 24182 df-tms 24183 df-cncf 24753 df-limc 25750 df-dv 25751 df-log 26445

This theorem is referenced by: chordthm 26724 chordthmALT 44270

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