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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 49049 | . 2 ⊢ ∀𝑎 ∈ (𝐸 ∖ {0})∀𝑏 ∈ 𝐸 (𝑎 · 𝑏) ≠ 𝑎 |
| 5 | eldifi 4084 | . . . . . . . . . 10 ⊢ (𝑎 ∈ (𝐸 ∖ {0}) → 𝑎 ∈ 𝐸) | |
| 6 | elrabi 3645 | . . . . . . . . . . . 12 ⊢ (𝑎 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑎 ∈ ℤ) | |
| 7 | 6 | zcnd 12707 | . . . . . . . . . . 11 ⊢ (𝑎 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑎 ∈ ℂ) |
| 8 | 7, 1 | eleq2s 2880 | . . . . . . . . . 10 ⊢ (𝑎 ∈ 𝐸 → 𝑎 ∈ ℂ) |
| 9 | 5, 8 | syl 18 | . . . . . . . . 9 ⊢ (𝑎 ∈ (𝐸 ∖ {0}) → 𝑎 ∈ ℂ) |
| 10 | elrabi 3645 | . . . . . . . . . . 11 ⊢ (𝑏 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑏 ∈ ℤ) | |
| 11 | 10 | zcnd 12707 | . . . . . . . . . 10 ⊢ (𝑏 ∈ {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} → 𝑏 ∈ ℂ) |
| 12 | 11, 1 | eleq2s 2880 | . . . . . . . . 9 ⊢ (𝑏 ∈ 𝐸 → 𝑏 ∈ ℂ) |
| 13 | mulcom 11192 | . . . . . . . . 9 ⊢ ((𝑎 ∈ ℂ ∧ 𝑏 ∈ ℂ) → (𝑎 · 𝑏) = (𝑏 · 𝑎)) | |
| 14 | 9, 12, 13 | syl2an 607 | . . . . . . . 8 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → (𝑎 · 𝑏) = (𝑏 · 𝑎)) |
| 15 | 14 | eqcomd 2768 | . . . . . . 7 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → (𝑏 · 𝑎) = (𝑎 · 𝑏)) |
| 16 | 15 | eqeq1d 2764 | . . . . . 6 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → ((𝑏 · 𝑎) = 𝑎 ↔ (𝑎 · 𝑏) = 𝑎)) |
| 17 | 16 | biimpd 232 | . . . . 5 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → ((𝑏 · 𝑎) = 𝑎 → (𝑎 · 𝑏) = 𝑎)) |
| 18 | 17 | necon3d 2978 | . . . 4 ⊢ ((𝑎 ∈ (𝐸 ∖ {0}) ∧ 𝑏 ∈ 𝐸) → ((𝑎 · 𝑏) ≠ 𝑎 → (𝑏 · 𝑎) ≠ 𝑎)) |
| 19 | 18 | ralimdva 3176 | . . 3 ⊢ (𝑎 ∈ (𝐸 ∖ {0}) → (∀𝑏 ∈ 𝐸 (𝑎 · 𝑏) ≠ 𝑎 → ∀𝑏 ∈ 𝐸 (𝑏 · 𝑎) ≠ 𝑎)) |
| 20 | 19 | ralimia 3098 | . 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 |
| This proof depends on syntax axioms: ∧ wa 400 = wceq 1569 ∈ wcel 2142 ≠ wne 2957 ∀wral 3078 ∃wrex 3088 {crab 3415 ∖ cdif 3901 {csn 4588 ‘cfv 6536 (class class class)co 7412 ℂcc 11104 0cc0 11106 · cmul 11111 2c2 12301 ℤcz 12597 ↾s cress 17296 mulGrpcmgp 20222 ℂfldccnfld 21533 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-sep 5256 ax-nul 5268 ax-pow 5335 ax-pr 5403 ax-un 7734 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1103 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-nf 1813 df-sb 2096 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3368 df-reu 3369 df-rab 3416 df-v 3456 df-sbc 3744 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-iun 4957 df-br 5109 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5555 df-eprel 5560 df-po 5568 df-so 5569 df-fr 5613 df-we 5615 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-res 5672 df-ima 5673 df-pred 6302 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7861 df-2nd 7985 df-frecs 8276 df-wrecs 8307 df-recs 8356 df-rdg 8395 df-er 8692 df-en 8942 df-dom 8943 df-sdom 8944 df-pnf 11251 df-mnf 11252 df-xr 11253 df-ltxr 11254 df-le 11255 df-sub 11449 df-neg 11450 df-div 11878 df-nn 12240 df-2 12309 df-n0 12511 df-z 12598 |
| This theorem is used by: (None) |
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