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Theorem axcnre 9739
Description: A complex number can be expressed in terms of two reals. Definition 10-1.1(v) of [Gleason] p. 130. Axiom 17 of 22 for real and complex numbers, derived from ZF set theory. This construction-dependent theorem should not be referenced directly; instead, use ax-cnre 9763. (Contributed by NM, 13-May-1996.) (New usage is discouraged.)
Assertion
Ref Expression
axcnre (𝐴 ∈ ℂ → ∃𝑥 ∈ ℝ ∃𝑦 ∈ ℝ 𝐴 = (𝑥 + (i · 𝑦)))
Distinct variable group:   𝑥,𝑦,𝐴

Proof of Theorem axcnre
Dummy variables 𝑧 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-c 9696 . 2 ℂ = (R × R)
2 eqeq1 2518 . . 3 (⟨𝑧, 𝑤⟩ = 𝐴 → (⟨𝑧, 𝑤⟩ = (𝑥 + (i · 𝑦)) ↔ 𝐴 = (𝑥 + (i · 𝑦))))
322rexbidv 2943 . 2 (⟨𝑧, 𝑤⟩ = 𝐴 → (∃𝑥 ∈ ℝ ∃𝑦 ∈ ℝ ⟨𝑧, 𝑤⟩ = (𝑥 + (i · 𝑦)) ↔ ∃𝑥 ∈ ℝ ∃𝑦 ∈ ℝ 𝐴 = (𝑥 + (i · 𝑦))))
4 opelreal 9705 . . . . . 6 (⟨𝑧, 0R⟩ ∈ ℝ ↔ 𝑧R)
5 opelreal 9705 . . . . . 6 (⟨𝑤, 0R⟩ ∈ ℝ ↔ 𝑤R)
64, 5anbi12i 728 . . . . 5 ((⟨𝑧, 0R⟩ ∈ ℝ ∧ ⟨𝑤, 0R⟩ ∈ ℝ) ↔ (𝑧R𝑤R))
76biimpri 216 . . . 4 ((𝑧R𝑤R) → (⟨𝑧, 0R⟩ ∈ ℝ ∧ ⟨𝑤, 0R⟩ ∈ ℝ))
8 df-i 9699 . . . . . . . . 9 i = ⟨0R, 1R
98oveq1i 6435 . . . . . . . 8 (i · ⟨𝑤, 0R⟩) = (⟨0R, 1R⟩ · ⟨𝑤, 0R⟩)
10 0r 9655 . . . . . . . . . 10 0RR
11 1sr 9656 . . . . . . . . . . 11 1RR
12 mulcnsr 9711 . . . . . . . . . . 11 (((0RR ∧ 1RR) ∧ (𝑤R ∧ 0RR)) → (⟨0R, 1R⟩ · ⟨𝑤, 0R⟩) = ⟨((0R ·R 𝑤) +R (-1R ·R (1R ·R 0R))), ((1R ·R 𝑤) +R (0R ·R 0R))⟩)
1310, 11, 12mpanl12 713 . . . . . . . . . 10 ((𝑤R ∧ 0RR) → (⟨0R, 1R⟩ · ⟨𝑤, 0R⟩) = ⟨((0R ·R 𝑤) +R (-1R ·R (1R ·R 0R))), ((1R ·R 𝑤) +R (0R ·R 0R))⟩)
1410, 13mpan2 702 . . . . . . . . 9 (𝑤R → (⟨0R, 1R⟩ · ⟨𝑤, 0R⟩) = ⟨((0R ·R 𝑤) +R (-1R ·R (1R ·R 0R))), ((1R ·R 𝑤) +R (0R ·R 0R))⟩)
15 mulcomsr 9664 . . . . . . . . . . . . 13 (0R ·R 𝑤) = (𝑤 ·R 0R)
16 00sr 9674 . . . . . . . . . . . . 13 (𝑤R → (𝑤 ·R 0R) = 0R)
1715, 16syl5eq 2560 . . . . . . . . . . . 12 (𝑤R → (0R ·R 𝑤) = 0R)
1817oveq1d 6440 . . . . . . . . . . 11 (𝑤R → ((0R ·R 𝑤) +R (-1R ·R (1R ·R 0R))) = (0R +R (-1R ·R (1R ·R 0R))))
19 00sr 9674 . . . . . . . . . . . . . . . 16 (1RR → (1R ·R 0R) = 0R)
2011, 19ax-mp 5 . . . . . . . . . . . . . . 15 (1R ·R 0R) = 0R
2120oveq2i 6436 . . . . . . . . . . . . . 14 (-1R ·R (1R ·R 0R)) = (-1R ·R 0R)
22 m1r 9657 . . . . . . . . . . . . . . 15 -1RR
23 00sr 9674 . . . . . . . . . . . . . . 15 (-1RR → (-1R ·R 0R) = 0R)
2422, 23ax-mp 5 . . . . . . . . . . . . . 14 (-1R ·R 0R) = 0R
2521, 24eqtri 2536 . . . . . . . . . . . . 13 (-1R ·R (1R ·R 0R)) = 0R
2625oveq2i 6436 . . . . . . . . . . . 12 (0R +R (-1R ·R (1R ·R 0R))) = (0R +R 0R)
27 0idsr 9672 . . . . . . . . . . . . 13 (0RR → (0R +R 0R) = 0R)
2810, 27ax-mp 5 . . . . . . . . . . . 12 (0R +R 0R) = 0R
2926, 28eqtri 2536 . . . . . . . . . . 11 (0R +R (-1R ·R (1R ·R 0R))) = 0R
3018, 29syl6eq 2564 . . . . . . . . . 10 (𝑤R → ((0R ·R 𝑤) +R (-1R ·R (1R ·R 0R))) = 0R)
31 mulcomsr 9664 . . . . . . . . . . . . 13 (1R ·R 𝑤) = (𝑤 ·R 1R)
32 1idsr 9673 . . . . . . . . . . . . 13 (𝑤R → (𝑤 ·R 1R) = 𝑤)
3331, 32syl5eq 2560 . . . . . . . . . . . 12 (𝑤R → (1R ·R 𝑤) = 𝑤)
3433oveq1d 6440 . . . . . . . . . . 11 (𝑤R → ((1R ·R 𝑤) +R (0R ·R 0R)) = (𝑤 +R (0R ·R 0R)))
35 00sr 9674 . . . . . . . . . . . . . 14 (0RR → (0R ·R 0R) = 0R)
3610, 35ax-mp 5 . . . . . . . . . . . . 13 (0R ·R 0R) = 0R
3736oveq2i 6436 . . . . . . . . . . . 12 (𝑤 +R (0R ·R 0R)) = (𝑤 +R 0R)
38 0idsr 9672 . . . . . . . . . . . 12 (𝑤R → (𝑤 +R 0R) = 𝑤)
3937, 38syl5eq 2560 . . . . . . . . . . 11 (𝑤R → (𝑤 +R (0R ·R 0R)) = 𝑤)
4034, 39eqtrd 2548 . . . . . . . . . 10 (𝑤R → ((1R ·R 𝑤) +R (0R ·R 0R)) = 𝑤)
4130, 40opeq12d 4246 . . . . . . . . 9 (𝑤R → ⟨((0R ·R 𝑤) +R (-1R ·R (1R ·R 0R))), ((1R ·R 𝑤) +R (0R ·R 0R))⟩ = ⟨0R, 𝑤⟩)
4214, 41eqtrd 2548 . . . . . . . 8 (𝑤R → (⟨0R, 1R⟩ · ⟨𝑤, 0R⟩) = ⟨0R, 𝑤⟩)
439, 42syl5eq 2560 . . . . . . 7 (𝑤R → (i · ⟨𝑤, 0R⟩) = ⟨0R, 𝑤⟩)
4443oveq2d 6441 . . . . . 6 (𝑤R → (⟨𝑧, 0R⟩ + (i · ⟨𝑤, 0R⟩)) = (⟨𝑧, 0R⟩ + ⟨0R, 𝑤⟩))
4544adantl 480 . . . . 5 ((𝑧R𝑤R) → (⟨𝑧, 0R⟩ + (i · ⟨𝑤, 0R⟩)) = (⟨𝑧, 0R⟩ + ⟨0R, 𝑤⟩))
46 addcnsr 9710 . . . . . . 7 (((𝑧R ∧ 0RR) ∧ (0RR𝑤R)) → (⟨𝑧, 0R⟩ + ⟨0R, 𝑤⟩) = ⟨(𝑧 +R 0R), (0R +R 𝑤)⟩)
4710, 46mpanl2 712 . . . . . 6 ((𝑧R ∧ (0RR𝑤R)) → (⟨𝑧, 0R⟩ + ⟨0R, 𝑤⟩) = ⟨(𝑧 +R 0R), (0R +R 𝑤)⟩)
4810, 47mpanr1 714 . . . . 5 ((𝑧R𝑤R) → (⟨𝑧, 0R⟩ + ⟨0R, 𝑤⟩) = ⟨(𝑧 +R 0R), (0R +R 𝑤)⟩)
49 0idsr 9672 . . . . . 6 (𝑧R → (𝑧 +R 0R) = 𝑧)
50 addcomsr 9662 . . . . . . 7 (0R +R 𝑤) = (𝑤 +R 0R)
5150, 38syl5eq 2560 . . . . . 6 (𝑤R → (0R +R 𝑤) = 𝑤)
52 opeq12 4240 . . . . . 6 (((𝑧 +R 0R) = 𝑧 ∧ (0R +R 𝑤) = 𝑤) → ⟨(𝑧 +R 0R), (0R +R 𝑤)⟩ = ⟨𝑧, 𝑤⟩)
5349, 51, 52syl2an 492 . . . . 5 ((𝑧R𝑤R) → ⟨(𝑧 +R 0R), (0R +R 𝑤)⟩ = ⟨𝑧, 𝑤⟩)
5445, 48, 533eqtrrd 2553 . . . 4 ((𝑧R𝑤R) → ⟨𝑧, 𝑤⟩ = (⟨𝑧, 0R⟩ + (i · ⟨𝑤, 0R⟩)))
55 opex 4757 . . . . 5 𝑧, 0R⟩ ∈ V
56 opex 4757 . . . . 5 𝑤, 0R⟩ ∈ V
57 eleq1 2580 . . . . . . 7 (𝑥 = ⟨𝑧, 0R⟩ → (𝑥 ∈ ℝ ↔ ⟨𝑧, 0R⟩ ∈ ℝ))
58 eleq1 2580 . . . . . . 7 (𝑦 = ⟨𝑤, 0R⟩ → (𝑦 ∈ ℝ ↔ ⟨𝑤, 0R⟩ ∈ ℝ))
5957, 58bi2anan9 912 . . . . . 6 ((𝑥 = ⟨𝑧, 0R⟩ ∧ 𝑦 = ⟨𝑤, 0R⟩) → ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) ↔ (⟨𝑧, 0R⟩ ∈ ℝ ∧ ⟨𝑤, 0R⟩ ∈ ℝ)))
60 oveq1 6432 . . . . . . . 8 (𝑥 = ⟨𝑧, 0R⟩ → (𝑥 + (i · 𝑦)) = (⟨𝑧, 0R⟩ + (i · 𝑦)))
61 oveq2 6433 . . . . . . . . 9 (𝑦 = ⟨𝑤, 0R⟩ → (i · 𝑦) = (i · ⟨𝑤, 0R⟩))
6261oveq2d 6441 . . . . . . . 8 (𝑦 = ⟨𝑤, 0R⟩ → (⟨𝑧, 0R⟩ + (i · 𝑦)) = (⟨𝑧, 0R⟩ + (i · ⟨𝑤, 0R⟩)))
6360, 62sylan9eq 2568 . . . . . . 7 ((𝑥 = ⟨𝑧, 0R⟩ ∧ 𝑦 = ⟨𝑤, 0R⟩) → (𝑥 + (i · 𝑦)) = (⟨𝑧, 0R⟩ + (i · ⟨𝑤, 0R⟩)))
6463eqeq2d 2524 . . . . . 6 ((𝑥 = ⟨𝑧, 0R⟩ ∧ 𝑦 = ⟨𝑤, 0R⟩) → (⟨𝑧, 𝑤⟩ = (𝑥 + (i · 𝑦)) ↔ ⟨𝑧, 𝑤⟩ = (⟨𝑧, 0R⟩ + (i · ⟨𝑤, 0R⟩))))
6559, 64anbi12d 742 . . . . 5 ((𝑥 = ⟨𝑧, 0R⟩ ∧ 𝑦 = ⟨𝑤, 0R⟩) → (((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) ∧ ⟨𝑧, 𝑤⟩ = (𝑥 + (i · 𝑦))) ↔ ((⟨𝑧, 0R⟩ ∈ ℝ ∧ ⟨𝑤, 0R⟩ ∈ ℝ) ∧ ⟨𝑧, 𝑤⟩ = (⟨𝑧, 0R⟩ + (i · ⟨𝑤, 0R⟩)))))
6655, 56, 65spc2ev 3178 . . . 4 (((⟨𝑧, 0R⟩ ∈ ℝ ∧ ⟨𝑤, 0R⟩ ∈ ℝ) ∧ ⟨𝑧, 𝑤⟩ = (⟨𝑧, 0R⟩ + (i · ⟨𝑤, 0R⟩))) → ∃𝑥𝑦((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) ∧ ⟨𝑧, 𝑤⟩ = (𝑥 + (i · 𝑦))))
677, 54, 66syl2anc 690 . . 3 ((𝑧R𝑤R) → ∃𝑥𝑦((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) ∧ ⟨𝑧, 𝑤⟩ = (𝑥 + (i · 𝑦))))
68 r2ex 2947 . . 3 (∃𝑥 ∈ ℝ ∃𝑦 ∈ ℝ ⟨𝑧, 𝑤⟩ = (𝑥 + (i · 𝑦)) ↔ ∃𝑥𝑦((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) ∧ ⟨𝑧, 𝑤⟩ = (𝑥 + (i · 𝑦))))
6967, 68sylibr 222 . 2 ((𝑧R𝑤R) → ∃𝑥 ∈ ℝ ∃𝑦 ∈ ℝ ⟨𝑧, 𝑤⟩ = (𝑥 + (i · 𝑦)))
701, 3, 69optocl 5012 1 (𝐴 ∈ ℂ → ∃𝑥 ∈ ℝ ∃𝑦 ∈ ℝ 𝐴 = (𝑥 + (i · 𝑦)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 382   = wceq 1474  wex 1694  wcel 1938  wrex 2801  cop 4034  (class class class)co 6425  Rcnr 9441  0Rc0r 9442  1Rc1r 9443  -1Rcm1r 9444   +R cplr 9445   ·R cmr 9446  cc 9688  cr 9689  ici 9692   + caddc 9693   · cmul 9695
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1700  ax-4 1713  ax-5 1793  ax-6 1838  ax-7 1885  ax-8 1940  ax-9 1947  ax-10 1966  ax-11 1971  ax-12 1983  ax-13 2137  ax-ext 2494  ax-sep 4607  ax-nul 4616  ax-pow 4668  ax-pr 4732  ax-un 6722  ax-inf2 8296
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3or 1031  df-3an 1032  df-tru 1477  df-ex 1695  df-nf 1699  df-sb 1831  df-eu 2366  df-mo 2367  df-clab 2501  df-cleq 2507  df-clel 2510  df-nfc 2644  df-ne 2686  df-ral 2805  df-rex 2806  df-reu 2807  df-rmo 2808  df-rab 2809  df-v 3079  df-sbc 3307  df-csb 3404  df-dif 3447  df-un 3449  df-in 3451  df-ss 3458  df-pss 3460  df-nul 3778  df-if 3940  df-pw 4013  df-sn 4029  df-pr 4031  df-tp 4033  df-op 4035  df-uni 4271  df-int 4309  df-iun 4355  df-br 4482  df-opab 4542  df-mpt 4543  df-tr 4579  df-eprel 4843  df-id 4847  df-po 4853  df-so 4854  df-fr 4891  df-we 4893  df-xp 4938  df-rel 4939  df-cnv 4940  df-co 4941  df-dm 4942  df-rn 4943  df-res 4944  df-ima 4945  df-pred 5487  df-ord 5533  df-on 5534  df-lim 5535  df-suc 5536  df-iota 5653  df-fun 5691  df-fn 5692  df-f 5693  df-f1 5694  df-fo 5695  df-f1o 5696  df-fv 5697  df-ov 6428  df-oprab 6429  df-mpt2 6430  df-om 6833  df-1st 6933  df-2nd 6934  df-wrecs 7168  df-recs 7230  df-rdg 7268  df-1o 7322  df-oadd 7326  df-omul 7327  df-er 7504  df-ec 7506  df-qs 7510  df-ni 9448  df-pli 9449  df-mi 9450  df-lti 9451  df-plpq 9484  df-mpq 9485  df-ltpq 9486  df-enq 9487  df-nq 9488  df-erq 9489  df-plq 9490  df-mq 9491  df-1nq 9492  df-rq 9493  df-ltnq 9494  df-np 9557  df-1p 9558  df-plp 9559  df-mp 9560  df-ltp 9561  df-enr 9631  df-nr 9632  df-plr 9633  df-mr 9634  df-0r 9636  df-1r 9637  df-m1r 9638  df-c 9696  df-i 9699  df-r 9700  df-add 9701  df-mul 9702
This theorem is referenced by: (None)
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