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Theorem colinearalglem1 28704

Description: Lemma for colinearalg 28708. 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 1190	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐵 ∈ ℂ)
2		simpl1 1189	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐴 ∈ ℂ)
3	1, 2	subcld 11593	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐵 − 𝐴) ∈ ℂ)
4		simpr3 1194	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐹 ∈ ℂ)
5		simpr1 1192	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐷 ∈ ℂ)
6	3, 4, 5	subdid 11692	. . . 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 11693	. . . . . 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 11693	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐵 − 𝐴) · 𝐷) = ((𝐵 · 𝐷) − (𝐴 · 𝐷)))
9	7, 8	oveq12d 7432	. . . . 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 1135	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → 𝐵 ∈ ℂ)
11		simp3 1136	. . . . . . . 8 ⊢ ((𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ) → 𝐹 ∈ ℂ)
12		mulcl 11214	. . . . . . . 8 ⊢ ((𝐵 ∈ ℂ ∧ 𝐹 ∈ ℂ) → (𝐵 · 𝐹) ∈ ℂ)
13	10, 11, 12	syl2an 595	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐵 · 𝐹) ∈ ℂ)
14		simp1 1134	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → 𝐴 ∈ ℂ)
15		mulcl 11214	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐹 ∈ ℂ) → (𝐴 · 𝐹) ∈ ℂ)
16	14, 11, 15	syl2an 595	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐴 · 𝐹) ∈ ℂ)
17	13, 16	subcld 11593	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐵 · 𝐹) − (𝐴 · 𝐹)) ∈ ℂ)
18		simp1 1134	. . . . . . 7 ⊢ ((𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ) → 𝐷 ∈ ℂ)
19		mulcl 11214	. . . . . . 7 ⊢ ((𝐵 ∈ ℂ ∧ 𝐷 ∈ ℂ) → (𝐵 · 𝐷) ∈ ℂ)
20	10, 18, 19	syl2an 595	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐵 · 𝐷) ∈ ℂ)
21		mulcl 11214	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝐷 ∈ ℂ) → (𝐴 · 𝐷) ∈ ℂ)
22	14, 18, 21	syl2an 595	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐴 · 𝐷) ∈ ℂ)
23	17, 20, 22	subsub3d 11623	. . . . 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 11614	. . . . 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 2772	. . . 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 11624	. . . . 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 7429	. . . 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 2773	. . 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 1193	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐸 ∈ ℂ)
30	29, 5	subcld 11593	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐸 − 𝐷) ∈ ℂ)
31		simpl3 1191	. . . . . 6 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → 𝐶 ∈ ℂ)
32	31, 2	subcld 11593	. . . . 5 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐶 − 𝐴) ∈ ℂ)
33	30, 32	mulcomd 11257	. . . 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 11692	. . . 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 11693	. . . . . . 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 11693	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐶 − 𝐴) · 𝐷) = ((𝐶 · 𝐷) − (𝐴 · 𝐷)))
37	35, 36	oveq12d 7432	. . . . . 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 1136	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → 𝐶 ∈ ℂ)
39		simp2 1135	. . . . . . . . 9 ⊢ ((𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ) → 𝐸 ∈ ℂ)
40		mulcl 11214	. . . . . . . . 9 ⊢ ((𝐶 ∈ ℂ ∧ 𝐸 ∈ ℂ) → (𝐶 · 𝐸) ∈ ℂ)
41	38, 39, 40	syl2an 595	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐶 · 𝐸) ∈ ℂ)
42		mulcl 11214	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 𝐸 ∈ ℂ) → (𝐴 · 𝐸) ∈ ℂ)
43	14, 39, 42	syl2an 595	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐴 · 𝐸) ∈ ℂ)
44	41, 43	subcld 11593	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐶 · 𝐸) − (𝐴 · 𝐸)) ∈ ℂ)
45		mulcl 11214	. . . . . . . 8 ⊢ ((𝐶 ∈ ℂ ∧ 𝐷 ∈ ℂ) → (𝐶 · 𝐷) ∈ ℂ)
46	38, 18, 45	syl2an 595	. . . . . . 7 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → (𝐶 · 𝐷) ∈ ℂ)
47	44, 46, 22	subsub3d 11623	. . . . . 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 11614	. . . . . 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 2772	. . . . 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 11624	. . . . . 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 7429	. . . . 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 2769	. . . 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 2771	. . 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 2743	. 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 11255	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐴 · 𝐹) + (𝐵 · 𝐷)) ∈ ℂ)
56	13, 55	subcld 11593	. . 3 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐵 · 𝐹) − ((𝐴 · 𝐹) + (𝐵 · 𝐷))) ∈ ℂ)
57	43, 46	addcld 11255	. . . 4 ⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) ∧ (𝐷 ∈ ℂ ∧ 𝐸 ∈ ℂ ∧ 𝐹 ∈ ℂ)) → ((𝐴 · 𝐸) + (𝐶 · 𝐷)) ∈ ℂ)
58	41, 57	subcld 11593	. . 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 11440	. 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 395 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 (class class class)co 7414 ℂcc 11128 + caddc 11133 · cmul 11135 − cmin 11466

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2164 ax-ext 2698 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-resscn 11187 ax-1cn 11188 ax-icn 11189 ax-addcl 11190 ax-addrcl 11191 ax-mulcl 11192 ax-mulrcl 11193 ax-mulcom 11194 ax-addass 11195 ax-mulass 11196 ax-distr 11197 ax-i2m1 11198 ax-1ne0 11199 ax-1rid 11200 ax-rnegex 11201 ax-rrecex 11202 ax-cnre 11203 ax-pre-lttri 11204 ax-pre-lttrn 11205 ax-pre-ltadd 11206

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2936 df-nel 3042 df-ral 3057 df-rex 3066 df-reu 3372 df-rab 3428 df-v 3471 df-sbc 3775 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-br 5143 df-opab 5205 df-mpt 5226 df-id 5570 df-po 5584 df-so 5585 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-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-er 8718 df-en 8956 df-dom 8957 df-sdom 8958 df-pnf 11272 df-mnf 11273 df-ltxr 11275 df-sub 11468

This theorem is referenced by: colinearalglem2 28705

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