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Mirrors > Home > MPE Home > Th. List > Mathboxes > 2zrngnmlid2 | Structured version Visualization version GIF version |
Description: R has no multiplicative (left) identity. (Contributed by AV, 12-Feb-2020.) |
Ref | Expression |
---|---|
2zrng.e | ⊢ 𝐸 = {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} |
2zrngbas.r | ⊢ 𝑅 = (ℂfld ↾s 𝐸) |
2zrngmmgm.1 | ⊢ 𝑀 = (mulGrp‘𝑅) |
Ref | Expression |
---|---|
2zrngnmlid2 | ⊢ ∀𝑎 ∈ (𝐸 ∖ {0})∀𝑏 ∈ 𝐸 (𝑏 · 𝑎) ≠ 𝑎 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2zrng.e | . . 3 ⊢ 𝐸 = {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} | |
2 | 2zrngbas.r | . . 3 ⊢ 𝑅 = (ℂfld ↾s 𝐸) | |
3 | 2zrngmmgm.1 | . . 3 ⊢ 𝑀 = (mulGrp‘𝑅) | |
4 | 1, 2, 3 | 2zrngnmrid 41950 | . 2 ⊢ ∀𝑎 ∈ (𝐸 ∖ {0})∀𝑏 ∈ 𝐸 (𝑎 · 𝑏) ≠ 𝑎 |
5 | eldifi 3732 | . . . . . . . . . 10 ⊢ (𝑎 ∈ (𝐸 ∖ {0}) → 𝑎 ∈ 𝐸) | |
6 | elrabi 3359 | . . . . . . . . . . . 12 ⊢ (𝑎 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑎 ∈ ℤ) | |
7 | 6 | zcnd 11483 | . . . . . . . . . . 11 ⊢ (𝑎 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑎 ∈ ℂ) |
8 | 7, 1 | eleq2s 2719 | . . . . . . . . . 10 ⊢ (𝑎 ∈ 𝐸 → 𝑎 ∈ ℂ) |
9 | 5, 8 | syl 17 | . . . . . . . . 9 ⊢ (𝑎 ∈ (𝐸 ∖ {0}) → 𝑎 ∈ ℂ) |
10 | elrabi 3359 | . . . . . . . . . . 11 ⊢ (𝑏 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑏 ∈ ℤ) | |
11 | 10 | zcnd 11483 | . . . . . . . . . 10 ⊢ (𝑏 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑏 ∈ ℂ) |
12 | 11, 1 | eleq2s 2719 | . . . . . . . . 9 ⊢ (𝑏 ∈ 𝐸 → 𝑏 ∈ ℂ) |
13 | mulcom 10022 | . . . . . . . . 9 ⊢ ((𝑎 ∈ ℂ ∧ 𝑏 ∈ ℂ) → (𝑎 · 𝑏) = (𝑏 · 𝑎)) | |
14 | 9, 12, 13 | syl2an 494 | . . . . . . . 8 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → (𝑎 · 𝑏) = (𝑏 · 𝑎)) |
15 | 14 | eqcomd 2628 | . . . . . . 7 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → (𝑏 · 𝑎) = (𝑎 · 𝑏)) |
16 | 15 | eqeq1d 2624 | . . . . . 6 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → ((𝑏 · 𝑎) = 𝑎 ↔ (𝑎 · 𝑏) = 𝑎)) |
17 | 16 | biimpd 219 | . . . . 5 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → ((𝑏 · 𝑎) = 𝑎 → (𝑎 · 𝑏) = 𝑎)) |
18 | 17 | necon3d 2815 | . . . 4 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → ((𝑎 · 𝑏) ≠ 𝑎 → (𝑏 · 𝑎) ≠ 𝑎)) |
19 | 18 | ralimdva 2962 | . . 3 ⊢ (𝑎 ∈ (𝐸 ∖ {0}) → (∀𝑏 ∈ 𝐸 (𝑎 · 𝑏) ≠ 𝑎 → ∀𝑏 ∈ 𝐸 (𝑏 · 𝑎) ≠ 𝑎)) |
20 | 19 | ralimia 2950 | . 2 ⊢ (∀𝑎 ∈ (𝐸 ∖ {0})∀𝑏 ∈ 𝐸 (𝑎 · 𝑏) ≠ 𝑎 → ∀𝑎 ∈ (𝐸 ∖ {0})∀𝑏 ∈ 𝐸 (𝑏 · 𝑎) ≠ 𝑎) |
21 | 4, 20 | ax-mp 5 | 1 ⊢ ∀𝑎 ∈ (𝐸 ∖ {0})∀𝑏 ∈ 𝐸 (𝑏 · 𝑎) ≠ 𝑎 |
Colors of variables: wff setvar class |
Syntax hints: ∧ wa 384 = wceq 1483 ∈ wcel 1990 ≠ wne 2794 ∀wral 2912 ∃wrex 2913 {crab 2916 ∖ cdif 3571 {csn 4177 ‘cfv 5888 (class class class)co 6650 ℂcc 9934 0cc0 9936 · cmul 9941 2c2 11070 ℤcz 11377 ↾s cress 15858 mulGrpcmgp 18489 ℂfldccnfld 19746 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-resscn 9993 ax-1cn 9994 ax-icn 9995 ax-addcl 9996 ax-addrcl 9997 ax-mulcl 9998 ax-mulrcl 9999 ax-mulcom 10000 ax-addass 10001 ax-mulass 10002 ax-distr 10003 ax-i2m1 10004 ax-1ne0 10005 ax-1rid 10006 ax-rnegex 10007 ax-rrecex 10008 ax-cnre 10009 ax-pre-lttri 10010 ax-pre-lttrn 10011 ax-pre-ltadd 10012 ax-pre-mulgt0 10013 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rmo 2920 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-er 7742 df-en 7956 df-dom 7957 df-sdom 7958 df-pnf 10076 df-mnf 10077 df-xr 10078 df-ltxr 10079 df-le 10080 df-sub 10268 df-neg 10269 df-div 10685 df-nn 11021 df-2 11079 df-n0 11293 df-z 11378 |
This theorem is referenced by: (None) |
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