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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 45487 | . 2 ⊢ ∀𝑎 ∈ (𝐸 ∖ {0})∀𝑏 ∈ 𝐸 (𝑎 · 𝑏) ≠ 𝑎 |
5 | eldifi 4066 | . . . . . . . . . 10 ⊢ (𝑎 ∈ (𝐸 ∖ {0}) → 𝑎 ∈ 𝐸) | |
6 | elrabi 3620 | . . . . . . . . . . . 12 ⊢ (𝑎 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑎 ∈ ℤ) | |
7 | 6 | zcnd 12438 | . . . . . . . . . . 11 ⊢ (𝑎 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑎 ∈ ℂ) |
8 | 7, 1 | eleq2s 2859 | . . . . . . . . . 10 ⊢ (𝑎 ∈ 𝐸 → 𝑎 ∈ ℂ) |
9 | 5, 8 | syl 17 | . . . . . . . . 9 ⊢ (𝑎 ∈ (𝐸 ∖ {0}) → 𝑎 ∈ ℂ) |
10 | elrabi 3620 | . . . . . . . . . . 11 ⊢ (𝑏 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑏 ∈ ℤ) | |
11 | 10 | zcnd 12438 | . . . . . . . . . 10 ⊢ (𝑏 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑏 ∈ ℂ) |
12 | 11, 1 | eleq2s 2859 | . . . . . . . . 9 ⊢ (𝑏 ∈ 𝐸 → 𝑏 ∈ ℂ) |
13 | mulcom 10968 | . . . . . . . . 9 ⊢ ((𝑎 ∈ ℂ ∧ 𝑏 ∈ ℂ) → (𝑎 · 𝑏) = (𝑏 · 𝑎)) | |
14 | 9, 12, 13 | syl2an 596 | . . . . . . . 8 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → (𝑎 · 𝑏) = (𝑏 · 𝑎)) |
15 | 14 | eqcomd 2746 | . . . . . . 7 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → (𝑏 · 𝑎) = (𝑎 · 𝑏)) |
16 | 15 | eqeq1d 2742 | . . . . . 6 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → ((𝑏 · 𝑎) = 𝑎 ↔ (𝑎 · 𝑏) = 𝑎)) |
17 | 16 | biimpd 228 | . . . . 5 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → ((𝑏 · 𝑎) = 𝑎 → (𝑎 · 𝑏) = 𝑎)) |
18 | 17 | necon3d 2966 | . . . 4 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → ((𝑎 · 𝑏) ≠ 𝑎 → (𝑏 · 𝑎) ≠ 𝑎)) |
19 | 18 | ralimdva 3105 | . . 3 ⊢ (𝑎 ∈ (𝐸 ∖ {0}) → (∀𝑏 ∈ 𝐸 (𝑎 · 𝑏) ≠ 𝑎 → ∀𝑏 ∈ 𝐸 (𝑏 · 𝑎) ≠ 𝑎)) |
20 | 19 | ralimia 3087 | . 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 396 = wceq 1542 ∈ wcel 2110 ≠ wne 2945 ∀wral 3066 ∃wrex 3067 {crab 3070 ∖ cdif 3889 {csn 4567 ‘cfv 6432 (class class class)co 7272 ℂcc 10880 0cc0 10882 · cmul 10887 2c2 12039 ℤcz 12330 ↾s cress 16952 mulGrpcmgp 19731 ℂfldccnfld 20608 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1975 ax-7 2015 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2711 ax-sep 5227 ax-nul 5234 ax-pow 5292 ax-pr 5356 ax-un 7583 ax-resscn 10939 ax-1cn 10940 ax-icn 10941 ax-addcl 10942 ax-addrcl 10943 ax-mulcl 10944 ax-mulrcl 10945 ax-mulcom 10946 ax-addass 10947 ax-mulass 10948 ax-distr 10949 ax-i2m1 10950 ax-1ne0 10951 ax-1rid 10952 ax-rnegex 10953 ax-rrecex 10954 ax-cnre 10955 ax-pre-lttri 10956 ax-pre-lttrn 10957 ax-pre-ltadd 10958 ax-pre-mulgt0 10959 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1545 df-fal 1555 df-ex 1787 df-nf 1791 df-sb 2072 df-mo 2542 df-eu 2571 df-clab 2718 df-cleq 2732 df-clel 2818 df-nfc 2891 df-ne 2946 df-nel 3052 df-ral 3071 df-rex 3072 df-reu 3073 df-rmo 3074 df-rab 3075 df-v 3433 df-sbc 3721 df-csb 3838 df-dif 3895 df-un 3897 df-in 3899 df-ss 3909 df-pss 3911 df-nul 4263 df-if 4466 df-pw 4541 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4846 df-iun 4932 df-br 5080 df-opab 5142 df-mpt 5163 df-tr 5197 df-id 5490 df-eprel 5496 df-po 5504 df-so 5505 df-fr 5545 df-we 5547 df-xp 5596 df-rel 5597 df-cnv 5598 df-co 5599 df-dm 5600 df-rn 5601 df-res 5602 df-ima 5603 df-pred 6201 df-ord 6268 df-on 6269 df-lim 6270 df-suc 6271 df-iota 6390 df-fun 6434 df-fn 6435 df-f 6436 df-f1 6437 df-fo 6438 df-f1o 6439 df-fv 6440 df-riota 7229 df-ov 7275 df-oprab 7276 df-mpo 7277 df-om 7708 df-2nd 7826 df-frecs 8089 df-wrecs 8120 df-recs 8194 df-rdg 8233 df-er 8490 df-en 8726 df-dom 8727 df-sdom 8728 df-pnf 11022 df-mnf 11023 df-xr 11024 df-ltxr 11025 df-le 11026 df-sub 11218 df-neg 11219 df-div 11644 df-nn 11985 df-2 12047 df-n0 12245 df-z 12331 |
This theorem is referenced by: (None) |
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