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Theorem angpieqvd 26781

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 26779	. . . . . 6 ⊢ (𝜑 → (-((𝐶 − 𝐵) / (𝐴 − 𝐵)) ∈ ℝ⁺ ↔ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π))
8	7	biimpar 476	. . . . 5 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → -((𝐶 − 𝐵) / (𝐴 − 𝐵)) ∈ ℝ⁺)
9	2	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐴 ∈ ℂ)
10	3	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐵 ∈ ℂ)
11	4	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐶 ∈ ℂ)
12	5	adantr 479	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐴 ≠ 𝐵)
13	1, 2, 3, 4, 5, 6	angpined 26780	. . . . . . 7 ⊢ (𝜑 → (((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π → 𝐴 ≠ 𝐶))
14	13	imp 405	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐴 ≠ 𝐶)
15	9, 10, 11, 12, 14	angpieqvdlem 26778	. . . . 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 11601	. . . . . . . 8 ⊢ (𝜑 → (𝐶 − 𝐵) ∈ ℂ)
18	17	adantr 479	. . . . . . 7 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (𝐶 − 𝐵) ∈ ℂ)
19	4, 2	subcld 11601	. . . . . . . 8 ⊢ (𝜑 → (𝐶 − 𝐴) ∈ ℂ)
20	19	adantr 479	. . . . . . 7 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (𝐶 − 𝐴) ∈ ℂ)
21	14	necomd 2986	. . . . . . . 8 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐶 ≠ 𝐴)
22	11, 9, 21	subne0d 11610	. . . . . . 7 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (𝐶 − 𝐴) ≠ 0)
23	18, 20, 22	divcan1d 12021	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (((𝐶 − 𝐵) / (𝐶 − 𝐴)) · (𝐶 − 𝐴)) = (𝐶 − 𝐵))
24	23	eqcomd 2731	. . . . 5 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → (𝐶 − 𝐵) = (((𝐶 − 𝐵) / (𝐶 − 𝐴)) · (𝐶 − 𝐴)))
25	18, 20, 22	divcld 12020	. . . . . 6 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → ((𝐶 − 𝐵) / (𝐶 − 𝐴)) ∈ ℂ)
26	9, 10, 11, 25	affineequiv 26773	. . . . 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 256	. . . 4 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → 𝐵 = ((((𝐶 − 𝐵) / (𝐶 − 𝐴)) · 𝐴) + ((1 − ((𝐶 − 𝐵) / (𝐶 − 𝐴))) · 𝐶)))
28		oveq1 7423	. . . . . 6 ⊢ (𝑤 = ((𝐶 − 𝐵) / (𝐶 − 𝐴)) → (𝑤 · 𝐴) = (((𝐶 − 𝐵) / (𝐶 − 𝐴)) · 𝐴))
29		oveq2 7424	. . . . . . 7 ⊢ (𝑤 = ((𝐶 − 𝐵) / (𝐶 − 𝐴)) → (1 − 𝑤) = (1 − ((𝐶 − 𝐵) / (𝐶 − 𝐴))))
30	29	oveq1d 7431	. . . . . 6 ⊢ (𝑤 = ((𝐶 − 𝐵) / (𝐶 − 𝐴)) → ((1 − 𝑤) · 𝐶) = ((1 − ((𝐶 − 𝐵) / (𝐶 − 𝐴))) · 𝐶))
31	28, 30	oveq12d 7434	. . . . 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 3623	. . . 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 582	. . 3 ⊢ ((𝜑 ∧ ((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π) → ∃𝑤 ∈ (0(,)1)𝐵 = ((𝑤 · 𝐴) + ((1 − 𝑤) · 𝐶)))
34	33	ex 411	. 2 ⊢ (𝜑 → (((𝐴 − 𝐵)𝐹(𝐶 − 𝐵)) = π → ∃𝑤 ∈ (0(,)1)𝐵 = ((𝑤 · 𝐴) + ((1 − 𝑤) · 𝐶))))
35	2	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → 𝐴 ∈ ℂ)
36	3	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → 𝐵 ∈ ℂ)
37	4	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → 𝐶 ∈ ℂ)
38		simpr 483	. . . . . 6 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → 𝑤 ∈ (0(,)1))
39		elioore 13386	. . . . . 6 ⊢ (𝑤 ∈ (0(,)1) → 𝑤 ∈ ℝ)
40		recn 11228	. . . . . 6 ⊢ (𝑤 ∈ ℝ → 𝑤 ∈ ℂ)
41	38, 39, 40	3syl 18	. . . . 5 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1)) → 𝑤 ∈ ℂ)
42	35, 36, 37, 41	affineequiv 26773	. . . 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 2986	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝐶 ≠ 𝐵)
48	4, 3, 47	subne0d 11610	. . . . . . . . . . . . 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 2999	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (𝑤 · (𝐶 − 𝐴)) ≠ 0)
51	45, 46, 50	mulne0bbd 11900	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (𝐶 − 𝐴) ≠ 0)
52	44, 45, 46, 51	divmul3d 12054	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → (((𝐶 − 𝐵) / (𝐶 − 𝐴)) = 𝑤 ↔ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))))
53	43, 52	mpbird 256	. . . . . . . 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 2825	. . . . . . 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 11612	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → 𝐶 ≠ 𝐴)
61	60	necomd 2986	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑤 ∈ (0(,)1) ∧ (𝐶 − 𝐵) = (𝑤 · (𝐶 − 𝐴))) → 𝐴 ≠ 𝐶)
62	56, 57, 58, 59, 61	angpieqvdlem 26778	. . . . . . 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 256	. . . . . 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 26779	. . . . . 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 3145	. 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 394 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2930 ∃wrex 3060 ∖ cdif 3936 {csn 4624 ‘cfv 6543 (class class class)co 7416 ∈ cmpo 7418 ℂcc 11136 ℝcr 11137 0cc0 11138 1c1 11139 + caddc 11141 · cmul 11143 − cmin 11474 -cneg 11475 / cdiv 11901 ℝ⁺crp 13006 (,)cioo 13356 ℑcim 15077 πcpi 16042 logclog 26506

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 2166 ax-ext 2696 ax-rep 5280 ax-sep 5294 ax-nul 5301 ax-pow 5359 ax-pr 5423 ax-un 7738 ax-inf2 9664 ax-cnex 11194 ax-resscn 11195 ax-1cn 11196 ax-icn 11197 ax-addcl 11198 ax-addrcl 11199 ax-mulcl 11200 ax-mulrcl 11201 ax-mulcom 11202 ax-addass 11203 ax-mulass 11204 ax-distr 11205 ax-i2m1 11206 ax-1ne0 11207 ax-1rid 11208 ax-rnegex 11209 ax-rrecex 11210 ax-cnre 11211 ax-pre-lttri 11212 ax-pre-lttrn 11213 ax-pre-ltadd 11214 ax-pre-mulgt0 11215 ax-pre-sup 11216 ax-addf 11217

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 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 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3465 df-sbc 3769 df-csb 3885 df-dif 3942 df-un 3944 df-in 3946 df-ss 3956 df-pss 3959 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-tp 4629 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-iin 4994 df-br 5144 df-opab 5206 df-mpt 5227 df-tr 5261 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-se 5628 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-isom 6552 df-riota 7372 df-ov 7419 df-oprab 7420 df-mpo 7421 df-of 7682 df-om 7869 df-1st 7991 df-2nd 7992 df-supp 8164 df-frecs 8285 df-wrecs 8316 df-recs 8390 df-rdg 8429 df-1o 8485 df-2o 8486 df-er 8723 df-map 8845 df-pm 8846 df-ixp 8915 df-en 8963 df-dom 8964 df-sdom 8965 df-fin 8966 df-fsupp 9386 df-fi 9434 df-sup 9465 df-inf 9466 df-oi 9533 df-card 9962 df-pnf 11280 df-mnf 11281 df-xr 11282 df-ltxr 11283 df-le 11284 df-sub 11476 df-neg 11477 df-div 11902 df-nn 12243 df-2 12305 df-3 12306 df-4 12307 df-5 12308 df-6 12309 df-7 12310 df-8 12311 df-9 12312 df-n0 12503 df-z 12589 df-dec 12708 df-uz 12853 df-q 12963 df-rp 13007 df-xneg 13124 df-xadd 13125 df-xmul 13126 df-ioo 13360 df-ioc 13361 df-ico 13362 df-icc 13363 df-fz 13517 df-fzo 13660 df-fl 13789 df-mod 13867 df-seq 13999 df-exp 14059 df-fac 14265 df-bc 14294 df-hash 14322 df-shft 15046 df-cj 15078 df-re 15079 df-im 15080 df-sqrt 15214 df-abs 15215 df-limsup 15447 df-clim 15464 df-rlim 15465 df-sum 15665 df-ef 16043 df-sin 16045 df-cos 16046 df-pi 16048 df-struct 17115 df-sets 17132 df-slot 17150 df-ndx 17162 df-base 17180 df-ress 17209 df-plusg 17245 df-mulr 17246 df-starv 17247 df-sca 17248 df-vsca 17249 df-ip 17250 df-tset 17251 df-ple 17252 df-ds 17254 df-unif 17255 df-hom 17256 df-cco 17257 df-rest 17403 df-topn 17404 df-0g 17422 df-gsum 17423 df-topgen 17424 df-pt 17425 df-prds 17428 df-xrs 17483 df-qtop 17488 df-imas 17489 df-xps 17491 df-mre 17565 df-mrc 17566 df-acs 17568 df-mgm 18599 df-sgrp 18678 df-mnd 18694 df-submnd 18740 df-mulg 19028 df-cntz 19272 df-cmn 19741 df-psmet 21275 df-xmet 21276 df-met 21277 df-bl 21278 df-mopn 21279 df-fbas 21280 df-fg 21281 df-cnfld 21284 df-top 22814 df-topon 22831 df-topsp 22853 df-bases 22867 df-cld 22941 df-ntr 22942 df-cls 22943 df-nei 23020 df-lp 23058 df-perf 23059 df-cn 23149 df-cnp 23150 df-haus 23237 df-tx 23484 df-hmeo 23677 df-fil 23768 df-fm 23860 df-flim 23861 df-flf 23862 df-xms 24244 df-ms 24245 df-tms 24246 df-cncf 24816 df-limc 25813 df-dv 25814 df-log 26508

This theorem is referenced by: chordthm 26787 chordthmALT 44437

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