Theorem axmulf 11058

Description: Multiplication is an operation on the complex numbers. This is the construction-dependent version of ax-mulf 11107 and it should not be referenced outside the construction. We generally prefer to develop our theory using the less specific mulcl 11111. (Contributed by NM, 8-Feb-2005.) (New usage is discouraged.)

Assertion

Ref	Expression
axmulf	⊢ · :(ℂ × ℂ)⟶ℂ

Proof of Theorem axmulf

Dummy variables 𝑥 𝑦 𝑧 𝑤 𝑣 𝑢 𝑓 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		moeq 3654	. . . . . . . . 9 ⊢ ∃*𝑧 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩
2	1	mosubop 5457	. . . . . . . 8 ⊢ ∃*𝑧∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)
3	2	mosubop 5457	. . . . . . 7 ⊢ ∃*𝑧∃𝑤∃𝑣(𝑥 = ⟨𝑤, 𝑣⟩ ∧ ∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))
4		anass 468	. . . . . . . . . . 11 ⊢ (((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩) ↔ (𝑥 = ⟨𝑤, 𝑣⟩ ∧ (𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
5	4	2exbii 1851	. . . . . . . . . 10 ⊢ (∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩) ↔ ∃𝑢∃𝑓(𝑥 = ⟨𝑤, 𝑣⟩ ∧ (𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
6		19.42vv 1959	. . . . . . . . . 10 ⊢ (∃𝑢∃𝑓(𝑥 = ⟨𝑤, 𝑣⟩ ∧ (𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)) ↔ (𝑥 = ⟨𝑤, 𝑣⟩ ∧ ∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
7	5, 6	bitri 275	. . . . . . . . 9 ⊢ (∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩) ↔ (𝑥 = ⟨𝑤, 𝑣⟩ ∧ ∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
8	7	2exbii 1851	. . . . . . . 8 ⊢ (∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩) ↔ ∃𝑤∃𝑣(𝑥 = ⟨𝑤, 𝑣⟩ ∧ ∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
9	8	mobii 2549	. . . . . . 7 ⊢ (∃*𝑧∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩) ↔ ∃*𝑧∃𝑤∃𝑣(𝑥 = ⟨𝑤, 𝑣⟩ ∧ ∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
10	3, 9	mpbir 231	. . . . . 6 ⊢ ∃*𝑧∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)
11	10	moani 2554	. . . . 5 ⊢ ∃*𝑧((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))
12	11	funoprab 7480	. . . 4 ⊢ Fun {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))}
13		df-mul 11039	. . . . 5 ⊢ · = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))}
14	13	funeqi 6511	. . . 4 ⊢ (Fun · ↔ Fun {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))})
15	12, 14	mpbir 231	. . 3 ⊢ Fun ·
16	13	dmeqi 5851	. . . . 5 ⊢ dom · = dom {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))}
17		dmoprabss 7462	. . . . 5 ⊢ dom {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))} ⊆ (ℂ × ℂ)
18	16, 17	eqsstri 3969	. . . 4 ⊢ dom · ⊆ (ℂ × ℂ)
19		0ncn 11045	. . . . 5 ⊢ ¬ ∅ ∈ ℂ
20		df-c 11033	. . . . . . 7 ⊢ ℂ = (R × R)
21		oveq1 7365	. . . . . . . 8 ⊢ (⟨𝑧, 𝑤⟩ = 𝑥 → (⟨𝑧, 𝑤⟩ · ⟨𝑣, 𝑢⟩) = (𝑥 · ⟨𝑣, 𝑢⟩))
22	21	eleq1d 2822	. . . . . . 7 ⊢ (⟨𝑧, 𝑤⟩ = 𝑥 → ((⟨𝑧, 𝑤⟩ · ⟨𝑣, 𝑢⟩) ∈ (R × R) ↔ (𝑥 · ⟨𝑣, 𝑢⟩) ∈ (R × R)))
23		oveq2 7366	. . . . . . . 8 ⊢ (⟨𝑣, 𝑢⟩ = 𝑦 → (𝑥 · ⟨𝑣, 𝑢⟩) = (𝑥 · 𝑦))
24	23	eleq1d 2822	. . . . . . 7 ⊢ (⟨𝑣, 𝑢⟩ = 𝑦 → ((𝑥 · ⟨𝑣, 𝑢⟩) ∈ (R × R) ↔ (𝑥 · 𝑦) ∈ (R × R)))
25		mulcnsr 11048	. . . . . . . 8 ⊢ (((𝑧 ∈ R ∧ 𝑤 ∈ R) ∧ (𝑣 ∈ R ∧ 𝑢 ∈ R)) → (⟨𝑧, 𝑤⟩ · ⟨𝑣, 𝑢⟩) = ⟨((𝑧 ·R 𝑣) +R (-1R ·R (𝑤 ·R 𝑢))), ((𝑤 ·R 𝑣) +R (𝑧 ·R 𝑢))⟩)
26		mulclsr 10996	. . . . . . . . . . 11 ⊢ ((𝑧 ∈ R ∧ 𝑣 ∈ R) → (𝑧 ·R 𝑣) ∈ R)
27		m1r 10994	. . . . . . . . . . . 12 ⊢ -1R ∈ R
28		mulclsr 10996	. . . . . . . . . . . 12 ⊢ ((𝑤 ∈ R ∧ 𝑢 ∈ R) → (𝑤 ·R 𝑢) ∈ R)
29		mulclsr 10996	. . . . . . . . . . . 12 ⊢ ((-1R ∈ R ∧ (𝑤 ·R 𝑢) ∈ R) → (-1R ·R (𝑤 ·R 𝑢)) ∈ R)
30	27, 28, 29	sylancr 588	. . . . . . . . . . 11 ⊢ ((𝑤 ∈ R ∧ 𝑢 ∈ R) → (-1R ·R (𝑤 ·R 𝑢)) ∈ R)
31		addclsr 10995	. . . . . . . . . . 11 ⊢ (((𝑧 ·R 𝑣) ∈ R ∧ (-1R ·R (𝑤 ·R 𝑢)) ∈ R) → ((𝑧 ·R 𝑣) +R (-1R ·R (𝑤 ·R 𝑢))) ∈ R)
32	26, 30, 31	syl2an 597	. . . . . . . . . 10 ⊢ (((𝑧 ∈ R ∧ 𝑣 ∈ R) ∧ (𝑤 ∈ R ∧ 𝑢 ∈ R)) → ((𝑧 ·R 𝑣) +R (-1R ·R (𝑤 ·R 𝑢))) ∈ R)
33	32	an4s 661	. . . . . . . . 9 ⊢ (((𝑧 ∈ R ∧ 𝑤 ∈ R) ∧ (𝑣 ∈ R ∧ 𝑢 ∈ R)) → ((𝑧 ·R 𝑣) +R (-1R ·R (𝑤 ·R 𝑢))) ∈ R)
34		mulclsr 10996	. . . . . . . . . . 11 ⊢ ((𝑤 ∈ R ∧ 𝑣 ∈ R) → (𝑤 ·R 𝑣) ∈ R)
35		mulclsr 10996	. . . . . . . . . . 11 ⊢ ((𝑧 ∈ R ∧ 𝑢 ∈ R) → (𝑧 ·R 𝑢) ∈ R)
36		addclsr 10995	. . . . . . . . . . 11 ⊢ (((𝑤 ·R 𝑣) ∈ R ∧ (𝑧 ·R 𝑢) ∈ R) → ((𝑤 ·R 𝑣) +R (𝑧 ·R 𝑢)) ∈ R)
37	34, 35, 36	syl2anr 598	. . . . . . . . . 10 ⊢ (((𝑧 ∈ R ∧ 𝑢 ∈ R) ∧ (𝑤 ∈ R ∧ 𝑣 ∈ R)) → ((𝑤 ·R 𝑣) +R (𝑧 ·R 𝑢)) ∈ R)
38	37	an42s 662	. . . . . . . . 9 ⊢ (((𝑧 ∈ R ∧ 𝑤 ∈ R) ∧ (𝑣 ∈ R ∧ 𝑢 ∈ R)) → ((𝑤 ·R 𝑣) +R (𝑧 ·R 𝑢)) ∈ R)
39	33, 38	opelxpd 5661	. . . . . . . 8 ⊢ (((𝑧 ∈ R ∧ 𝑤 ∈ R) ∧ (𝑣 ∈ R ∧ 𝑢 ∈ R)) → ⟨((𝑧 ·R 𝑣) +R (-1R ·R (𝑤 ·R 𝑢))), ((𝑤 ·R 𝑣) +R (𝑧 ·R 𝑢))⟩ ∈ (R × R))
40	25, 39	eqeltrd 2837	. . . . . . 7 ⊢ (((𝑧 ∈ R ∧ 𝑤 ∈ R) ∧ (𝑣 ∈ R ∧ 𝑢 ∈ R)) → (⟨𝑧, 𝑤⟩ · ⟨𝑣, 𝑢⟩) ∈ (R × R))
41	20, 22, 24, 40	2optocl 5718	. . . . . 6 ⊢ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) → (𝑥 · 𝑦) ∈ (R × R))
42	41, 20	eleqtrrdi 2848	. . . . 5 ⊢ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) → (𝑥 · 𝑦) ∈ ℂ)
43	19, 42	oprssdm 7539	. . . 4 ⊢ (ℂ × ℂ) ⊆ dom ·
44	18, 43	eqssi 3939	. . 3 ⊢ dom · = (ℂ × ℂ)
45		df-fn 6493	. . 3 ⊢ ( · Fn (ℂ × ℂ) ↔ (Fun · ∧ dom · = (ℂ × ℂ)))
46	15, 44, 45	mpbir2an 712	. 2 ⊢ · Fn (ℂ × ℂ)
47	42	rgen2 3178	. 2 ⊢ ∀𝑥 ∈ ℂ ∀𝑦 ∈ ℂ (𝑥 · 𝑦) ∈ ℂ
48		ffnov 7484	. 2 ⊢ ( · :(ℂ × ℂ)⟶ℂ ↔ ( · Fn (ℂ × ℂ) ∧ ∀𝑥 ∈ ℂ ∀𝑦 ∈ ℂ (𝑥 · 𝑦) ∈ ℂ))
49	46, 47, 48	mpbir2an 712	1 ⊢ · :(ℂ × ℂ)⟶ℂ

Syntax hints:   ∧ wa 395   = wceq 1542  ∃wex 1781   ∈ wcel 2114  ∃*wmo 2538  ∀wral 3052  ⟨cop 4574   × cxp 5620  dom cdm 5622  Fun wfun 6484   Fn wfn 6485  ⟶wf 6486  (class class class)co 7358  {coprab 7359  Rcnr 10777  -1_Rcm1r 10780   +_R cplr 10781   ·_R cmr 10782  ℂcc 11025   · cmul 11032

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5231  ax-nul 5241  ax-pow 5300  ax-pr 5368  ax-un 7680  ax-inf2 9551

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rmo 3343  df-reu 3344  df-rab 3391  df-v 3432  df-sbc 3730  df-csb 3839  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-pss 3910  df-nul 4275  df-if 4468  df-pw 4544  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-int 4891  df-iun 4936  df-br 5087  df-opab 5149  df-mpt 5168  df-tr 5194  df-id 5517  df-eprel 5522  df-po 5530  df-so 5531  df-fr 5575  df-we 5577  df-xp 5628  df-rel 5629  df-cnv 5630  df-co 5631  df-dm 5632  df-rn 5633  df-res 5634  df-ima 5635  df-pred 6257  df-ord 6318  df-on 6319  df-lim 6320  df-suc 6321  df-iota 6446  df-fun 6492  df-fn 6493  df-f 6494  df-f1 6495  df-fo 6496  df-f1o 6497  df-fv 6498  df-ov 7361  df-oprab 7362  df-mpo 7363  df-om 7809  df-1st 7933  df-2nd 7934  df-frecs 8222  df-wrecs 8253  df-recs 8302  df-rdg 8340  df-1o 8396  df-oadd 8400  df-omul 8401  df-er 8634  df-ec 8636  df-qs 8640  df-ni 10784  df-pli 10785  df-mi 10786  df-lti 10787  df-plpq 10820  df-mpq 10821  df-ltpq 10822  df-enq 10823  df-nq 10824  df-erq 10825  df-plq 10826  df-mq 10827  df-1nq 10828  df-rq 10829  df-ltnq 10830  df-np 10893  df-1p 10894  df-plp 10895  df-mp 10896  df-ltp 10897  df-enr 10967  df-nr 10968  df-plr 10969  df-mr 10970  df-m1r 10974  df-c 11033  df-mul 11039

This theorem is referenced by:  axmulcl  11065