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Theorem colinearalglem1 28164

Description: Lemma for colinearalg 28168. Expand out a multiplication. (Contributed by Scott Fenton, 24-Jun-2013.)

**Assertion**
Ref	Expression
colinearalglem1	⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (((𝐵 − 𝐴) · (𝐹 − 𝐷)) = ((𝐸 − 𝐷) · (𝐶 − 𝐴)) ↔ ((𝐵 · 𝐹) − ((𝐴 · 𝐹) + (𝐵 · 𝐷))) = ((𝐶 · 𝐸) − ((𝐴 · 𝐸) + (𝐶 · 𝐷)))))

**Proof of Theorem colinearalglem1**
Step	Hyp	Ref	Expression
1		simpl2 1193	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐵 ∈ ℂ)
2		simpl1 1192	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐴 ∈ ℂ)
3	1, 2	subcld 11571	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐵 − 𝐴) ∈ ℂ)
4		simpr3 1197	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐹 ∈ ℂ)
5		simpr1 1195	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐷 ∈ ℂ)
6	3, 4, 5	subdid 11670	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐵 − 𝐴) · (𝐹 − 𝐷)) = (((𝐵 − 𝐴) · 𝐹) − ((𝐵 − 𝐴) · 𝐷)))
7	1, 2, 4	subdird 11671	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐵 − 𝐴) · 𝐹) = ((𝐵 · 𝐹) − (𝐴 · 𝐹)))
8	1, 2, 5	subdird 11671	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐵 − 𝐴) · 𝐷) = ((𝐵 · 𝐷) − (𝐴 · 𝐷)))
9	7, 8	oveq12d 7427	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (((𝐵 − 𝐴) · 𝐹) − ((𝐵 − 𝐴) · 𝐷)) = (((𝐵 · 𝐹) − (𝐴 · 𝐹)) − ((𝐵 · 𝐷) − (𝐴 · 𝐷))))
10		simp2 1138	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → 𝐵 ∈ ℂ)
11		simp3 1139	. . . . . . . 8 ⊢ ((𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ) → 𝐹 ∈ ℂ)
12		mulcl 11194	. . . . . . . 8 ⊢ ((𝐵 ∈ ℂ ∧ 𝐹 ∈ ℂ) → (𝐵 · 𝐹) ∈ ℂ)
13	10, 11, 12	syl2an 597	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐵 · 𝐹) ∈ ℂ)
14		simp1 1137	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → 𝐴 ∈ ℂ)
15		mulcl 11194	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐹 ∈ ℂ) → (𝐴 · 𝐹) ∈ ℂ)
16	14, 11, 15	syl2an 597	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐴 · 𝐹) ∈ ℂ)
17	13, 16	subcld 11571	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐵 · 𝐹) − (𝐴 · 𝐹)) ∈ ℂ)
18		simp1 1137	. . . . . . 7 ⊢ ((𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ) → 𝐷 ∈ ℂ)
19		mulcl 11194	. . . . . . 7 ⊢ ((𝐵 ∈ ℂ ∧ 𝐷 ∈ ℂ) → (𝐵 · 𝐷) ∈ ℂ)
20	10, 18, 19	syl2an 597	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐵 · 𝐷) ∈ ℂ)
21		mulcl 11194	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝐷 ∈ ℂ) → (𝐴 · 𝐷) ∈ ℂ)
22	14, 18, 21	syl2an 597	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐴 · 𝐷) ∈ ℂ)
23	17, 20, 22	subsub3d 11601	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (((𝐵 · 𝐹) − (𝐴 · 𝐹)) − ((𝐵 · 𝐷) − (𝐴 · 𝐷))) = ((((𝐵 · 𝐹) − (𝐴 · 𝐹)) + (𝐴 · 𝐷)) − (𝐵 · 𝐷)))
24	17, 22, 20	addsubd 11592	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((((𝐵 · 𝐹) − (𝐴 · 𝐹)) + (𝐴 · 𝐷)) − (𝐵 · 𝐷)) = ((((𝐵 · 𝐹) − (𝐴 · 𝐹)) − (𝐵 · 𝐷)) + (𝐴 · 𝐷)))
25	9, 23, 24	3eqtrrd 2778	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((((𝐵 · 𝐹) − (𝐴 · 𝐹)) − (𝐵 · 𝐷)) + (𝐴 · 𝐷)) = (((𝐵 − 𝐴) · 𝐹) − ((𝐵 − 𝐴) · 𝐷)))
26	13, 16, 20	subsub4d 11602	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (((𝐵 · 𝐹) − (𝐴 · 𝐹)) − (𝐵 · 𝐷)) = ((𝐵 · 𝐹) − ((𝐴 · 𝐹) + (𝐵 · 𝐷))))
27	26	oveq1d 7424	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((((𝐵 · 𝐹) − (𝐴 · 𝐹)) − (𝐵 · 𝐷)) + (𝐴 · 𝐷)) = (((𝐵 · 𝐹) − ((𝐴 · 𝐹) + (𝐵 · 𝐷))) + (𝐴 · 𝐷)))
28	6, 25, 27	3eqtr2d 2779	. . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐵 − 𝐴) · (𝐹 − 𝐷)) = (((𝐵 · 𝐹) − ((𝐴 · 𝐹) + (𝐵 · 𝐷))) + (𝐴 · 𝐷)))
29		simpr2 1196	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐸 ∈ ℂ)
30	29, 5	subcld 11571	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐸 − 𝐷) ∈ ℂ)
31		simpl3 1194	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐶 ∈ ℂ)
32	31, 2	subcld 11571	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐶 − 𝐴) ∈ ℂ)
33	30, 32	mulcomd 11235	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐸 − 𝐷) · (𝐶 − 𝐴)) = ((𝐶 − 𝐴) · (𝐸 − 𝐷)))
34	32, 29, 5	subdid 11670	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐶 − 𝐴) · (𝐸 − 𝐷)) = (((𝐶 − 𝐴) · 𝐸) − ((𝐶 − 𝐴) · 𝐷)))
35	31, 2, 29	subdird 11671	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐶 − 𝐴) · 𝐸) = ((𝐶 · 𝐸) − (𝐴 · 𝐸)))
36	31, 2, 5	subdird 11671	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐶 − 𝐴) · 𝐷) = ((𝐶 · 𝐷) − (𝐴 · 𝐷)))
37	35, 36	oveq12d 7427	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (((𝐶 − 𝐴) · 𝐸) − ((𝐶 − 𝐴) · 𝐷)) = (((𝐶 · 𝐸) − (𝐴 · 𝐸)) − ((𝐶 · 𝐷) − (𝐴 · 𝐷))))
38		simp3 1139	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → 𝐶 ∈ ℂ)
39		simp2 1138	. . . . . . . . 9 ⊢ ((𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ) → 𝐸 ∈ ℂ)
40		mulcl 11194	. . . . . . . . 9 ⊢ ((𝐶 ∈ ℂ ∧ 𝐸 ∈ ℂ) → (𝐶 · 𝐸) ∈ ℂ)
41	38, 39, 40	syl2an 597	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐶 · 𝐸) ∈ ℂ)
42		mulcl 11194	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 𝐸 ∈ ℂ) → (𝐴 · 𝐸) ∈ ℂ)
43	14, 39, 42	syl2an 597	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐴 · 𝐸) ∈ ℂ)
44	41, 43	subcld 11571	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐶 · 𝐸) − (𝐴 · 𝐸)) ∈ ℂ)
45		mulcl 11194	. . . . . . . 8 ⊢ ((𝐶 ∈ ℂ ∧ 𝐷 ∈ ℂ) → (𝐶 · 𝐷) ∈ ℂ)
46	38, 18, 45	syl2an 597	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐶 · 𝐷) ∈ ℂ)
47	44, 46, 22	subsub3d 11601	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (((𝐶 · 𝐸) − (𝐴 · 𝐸)) − ((𝐶 · 𝐷) − (𝐴 · 𝐷))) = ((((𝐶 · 𝐸) − (𝐴 · 𝐸)) + (𝐴 · 𝐷)) − (𝐶 · 𝐷)))
48	44, 22, 46	addsubd 11592	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((((𝐶 · 𝐸) − (𝐴 · 𝐸)) + (𝐴 · 𝐷)) − (𝐶 · 𝐷)) = ((((𝐶 · 𝐸) − (𝐴 · 𝐸)) − (𝐶 · 𝐷)) + (𝐴 · 𝐷)))
49	37, 47, 48	3eqtrrd 2778	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((((𝐶 · 𝐸) − (𝐴 · 𝐸)) − (𝐶 · 𝐷)) + (𝐴 · 𝐷)) = (((𝐶 − 𝐴) · 𝐸) − ((𝐶 − 𝐴) · 𝐷)))
50	41, 43, 46	subsub4d 11602	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (((𝐶 · 𝐸) − (𝐴 · 𝐸)) − (𝐶 · 𝐷)) = ((𝐶 · 𝐸) − ((𝐴 · 𝐸) + (𝐶 · 𝐷))))
51	50	oveq1d 7424	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((((𝐶 · 𝐸) − (𝐴 · 𝐸)) − (𝐶 · 𝐷)) + (𝐴 · 𝐷)) = (((𝐶 · 𝐸) − ((𝐴 · 𝐸) + (𝐶 · 𝐷))) + (𝐴 · 𝐷)))
52	49, 51	eqtr3d 2775	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (((𝐶 − 𝐴) · 𝐸) − ((𝐶 − 𝐴) · 𝐷)) = (((𝐶 · 𝐸) − ((𝐴 · 𝐸) + (𝐶 · 𝐷))) + (𝐴 · 𝐷)))
53	33, 34, 52	3eqtrd 2777	. . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐸 − 𝐷) · (𝐶 − 𝐴)) = (((𝐶 · 𝐸) − ((𝐴 · 𝐸) + (𝐶 · 𝐷))) + (𝐴 · 𝐷)))
54	28, 53	eqeq12d 2749	. 2 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (((𝐵 − 𝐴) · (𝐹 − 𝐷)) = ((𝐸 − 𝐷) · (𝐶 − 𝐴)) ↔ (((𝐵 · 𝐹) − ((𝐴 · 𝐹) + (𝐵 · 𝐷))) + (𝐴 · 𝐷)) = (((𝐶 · 𝐸) − ((𝐴 · 𝐸) + (𝐶 · 𝐷))) + (𝐴 · 𝐷))))
55	16, 20	addcld 11233	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐴 · 𝐹) + (𝐵 · 𝐷)) ∈ ℂ)
56	13, 55	subcld 11571	. . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐵 · 𝐹) − ((𝐴 · 𝐹) + (𝐵 · 𝐷))) ∈ ℂ)
57	43, 46	addcld 11233	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐴 · 𝐸) + (𝐶 · 𝐷)) ∈ ℂ)
58	41, 57	subcld 11571	. . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐶 · 𝐸) − ((𝐴 · 𝐸) + (𝐶 · 𝐷))) ∈ ℂ)
59	56, 58, 22	addcan2d 11418	. 2 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((((𝐵 · 𝐹) − ((𝐴 · 𝐹) + (𝐵 · 𝐷))) + (𝐴 · 𝐷)) = (((𝐶 · 𝐸) − ((𝐴 · 𝐸) + (𝐶 · 𝐷))) + (𝐴 · 𝐷)) ↔ ((𝐵 · 𝐹) − ((𝐴 · 𝐹) + (𝐵 · 𝐷))) = ((𝐶 · 𝐸) − ((𝐴 · 𝐸) + (𝐶 · 𝐷)))))
60	54, 59	bitrd 279	1 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (((𝐵 − 𝐴) · (𝐹 − 𝐷)) = ((𝐸 − 𝐷) · (𝐶 − 𝐴)) ↔ ((𝐵 · 𝐹) − ((𝐴 · 𝐹) + (𝐵 · 𝐷))) = ((𝐶 · 𝐸) − ((𝐴 · 𝐸) + (𝐶 · 𝐷)))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 ∧ w3a 1088 = wceq 1542 ∈ wcel 2107 (class class class)co 7409 ℂcc 11108 + caddc 11113 · cmul 11115 − cmin 11444

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-br 5150 df-opab 5212 df-mpt 5233 df-id 5575 df-po 5589 df-so 5590 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-er 8703 df-en 8940 df-dom 8941 df-sdom 8942 df-pnf 11250 df-mnf 11251 df-ltxr 11253 df-sub 11446

This theorem is referenced by: colinearalglem2 28165

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