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Mirrors > Home > MPE Home > Th. List > creur | Structured version Visualization version GIF version |
Description: The real part of a complex number is unique. Proposition 10-1.3 of [Gleason] p. 130. (Contributed by NM, 9-May-1999.) (Proof shortened by Mario Carneiro, 27-May-2016.) |
Ref | Expression |
---|---|
creur | ⊢ (𝐴 ∈ ℂ → ∃!𝑥 ∈ ℝ ∃𝑦 ∈ ℝ 𝐴 = (𝑥 + (i · 𝑦))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cnre 9915 | . 2 ⊢ (𝐴 ∈ ℂ → ∃𝑧 ∈ ℝ ∃𝑤 ∈ ℝ 𝐴 = (𝑧 + (i · 𝑤))) | |
2 | cru 10889 | . . . . . . . . . . 11 ⊢ (((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) ∧ (𝑧 ∈ ℝ ∧ 𝑤 ∈ ℝ)) → ((𝑥 + (i · 𝑦)) = (𝑧 + (i · 𝑤)) ↔ (𝑥 = 𝑧 ∧ 𝑦 = 𝑤))) | |
3 | 2 | ancoms 468 | . . . . . . . . . 10 ⊢ (((𝑧 ∈ ℝ ∧ 𝑤 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ)) → ((𝑥 + (i · 𝑦)) = (𝑧 + (i · 𝑤)) ↔ (𝑥 = 𝑧 ∧ 𝑦 = 𝑤))) |
4 | eqcom 2617 | . . . . . . . . . 10 ⊢ ((𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦)) ↔ (𝑥 + (i · 𝑦)) = (𝑧 + (i · 𝑤))) | |
5 | ancom 465 | . . . . . . . . . 10 ⊢ ((𝑦 = 𝑤 ∧ 𝑥 = 𝑧) ↔ (𝑥 = 𝑧 ∧ 𝑦 = 𝑤)) | |
6 | 3, 4, 5 | 3bitr4g 302 | . . . . . . . . 9 ⊢ (((𝑧 ∈ ℝ ∧ 𝑤 ∈ ℝ) ∧ (𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ)) → ((𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦)) ↔ (𝑦 = 𝑤 ∧ 𝑥 = 𝑧))) |
7 | 6 | anassrs 678 | . . . . . . . 8 ⊢ ((((𝑧 ∈ ℝ ∧ 𝑤 ∈ ℝ) ∧ 𝑥 ∈ ℝ) ∧ 𝑦 ∈ ℝ) → ((𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦)) ↔ (𝑦 = 𝑤 ∧ 𝑥 = 𝑧))) |
8 | 7 | rexbidva 3031 | . . . . . . 7 ⊢ (((𝑧 ∈ ℝ ∧ 𝑤 ∈ ℝ) ∧ 𝑥 ∈ ℝ) → (∃𝑦 ∈ ℝ (𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦)) ↔ ∃𝑦 ∈ ℝ (𝑦 = 𝑤 ∧ 𝑥 = 𝑧))) |
9 | biidd 251 | . . . . . . . . 9 ⊢ (𝑦 = 𝑤 → (𝑥 = 𝑧 ↔ 𝑥 = 𝑧)) | |
10 | 9 | ceqsrexv 3306 | . . . . . . . 8 ⊢ (𝑤 ∈ ℝ → (∃𝑦 ∈ ℝ (𝑦 = 𝑤 ∧ 𝑥 = 𝑧) ↔ 𝑥 = 𝑧)) |
11 | 10 | ad2antlr 759 | . . . . . . 7 ⊢ (((𝑧 ∈ ℝ ∧ 𝑤 ∈ ℝ) ∧ 𝑥 ∈ ℝ) → (∃𝑦 ∈ ℝ (𝑦 = 𝑤 ∧ 𝑥 = 𝑧) ↔ 𝑥 = 𝑧)) |
12 | 8, 11 | bitrd 267 | . . . . . 6 ⊢ (((𝑧 ∈ ℝ ∧ 𝑤 ∈ ℝ) ∧ 𝑥 ∈ ℝ) → (∃𝑦 ∈ ℝ (𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦)) ↔ 𝑥 = 𝑧)) |
13 | 12 | ralrimiva 2949 | . . . . 5 ⊢ ((𝑧 ∈ ℝ ∧ 𝑤 ∈ ℝ) → ∀𝑥 ∈ ℝ (∃𝑦 ∈ ℝ (𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦)) ↔ 𝑥 = 𝑧)) |
14 | reu6i 3364 | . . . . 5 ⊢ ((𝑧 ∈ ℝ ∧ ∀𝑥 ∈ ℝ (∃𝑦 ∈ ℝ (𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦)) ↔ 𝑥 = 𝑧)) → ∃!𝑥 ∈ ℝ ∃𝑦 ∈ ℝ (𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦))) | |
15 | 13, 14 | syldan 486 | . . . 4 ⊢ ((𝑧 ∈ ℝ ∧ 𝑤 ∈ ℝ) → ∃!𝑥 ∈ ℝ ∃𝑦 ∈ ℝ (𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦))) |
16 | eqeq1 2614 | . . . . . 6 ⊢ (𝐴 = (𝑧 + (i · 𝑤)) → (𝐴 = (𝑥 + (i · 𝑦)) ↔ (𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦)))) | |
17 | 16 | rexbidv 3034 | . . . . 5 ⊢ (𝐴 = (𝑧 + (i · 𝑤)) → (∃𝑦 ∈ ℝ 𝐴 = (𝑥 + (i · 𝑦)) ↔ ∃𝑦 ∈ ℝ (𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦)))) |
18 | 17 | reubidv 3103 | . . . 4 ⊢ (𝐴 = (𝑧 + (i · 𝑤)) → (∃!𝑥 ∈ ℝ ∃𝑦 ∈ ℝ 𝐴 = (𝑥 + (i · 𝑦)) ↔ ∃!𝑥 ∈ ℝ ∃𝑦 ∈ ℝ (𝑧 + (i · 𝑤)) = (𝑥 + (i · 𝑦)))) |
19 | 15, 18 | syl5ibrcom 236 | . . 3 ⊢ ((𝑧 ∈ ℝ ∧ 𝑤 ∈ ℝ) → (𝐴 = (𝑧 + (i · 𝑤)) → ∃!𝑥 ∈ ℝ ∃𝑦 ∈ ℝ 𝐴 = (𝑥 + (i · 𝑦)))) |
20 | 19 | rexlimivv 3018 | . 2 ⊢ (∃𝑧 ∈ ℝ ∃𝑤 ∈ ℝ 𝐴 = (𝑧 + (i · 𝑤)) → ∃!𝑥 ∈ ℝ ∃𝑦 ∈ ℝ 𝐴 = (𝑥 + (i · 𝑦))) |
21 | 1, 20 | syl 17 | 1 ⊢ (𝐴 ∈ ℂ → ∃!𝑥 ∈ ℝ ∃𝑦 ∈ ℝ 𝐴 = (𝑥 + (i · 𝑦))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 = wceq 1475 ∈ wcel 1977 ∀wral 2896 ∃wrex 2897 ∃!wreu 2898 (class class class)co 6549 ℂcc 9813 ℝcr 9814 ici 9817 + caddc 9818 · cmul 9820 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 ax-pre-mulgt0 9892 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rmo 2904 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-po 4959 df-so 4960 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-er 7629 df-en 7842 df-dom 7843 df-sdom 7844 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-div 10564 |
This theorem is referenced by: (None) |
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