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Mirrors > Home > MPE Home > Th. List > isringid | Structured version Visualization version GIF version |
Description: Properties showing that an element 𝐼 is the unity element of a ring. (Contributed by NM, 7-Aug-2013.) |
Ref | Expression |
---|---|
rngidm.b | ⊢ 𝐵 = (Base‘𝑅) |
rngidm.t | ⊢ · = (.r‘𝑅) |
rngidm.u | ⊢ 1 = (1r‘𝑅) |
Ref | Expression |
---|---|
isringid | ⊢ (𝑅 ∈ Ring → ((𝐼 ∈ 𝐵 ∧ ∀𝑥 ∈ 𝐵 ((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥)) ↔ 1 = 𝐼)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2823 | . . 3 ⊢ (mulGrp‘𝑅) = (mulGrp‘𝑅) | |
2 | rngidm.b | . . 3 ⊢ 𝐵 = (Base‘𝑅) | |
3 | 1, 2 | mgpbas 19247 | . 2 ⊢ 𝐵 = (Base‘(mulGrp‘𝑅)) |
4 | rngidm.u | . . 3 ⊢ 1 = (1r‘𝑅) | |
5 | 1, 4 | ringidval 19255 | . 2 ⊢ 1 = (0g‘(mulGrp‘𝑅)) |
6 | rngidm.t | . . 3 ⊢ · = (.r‘𝑅) | |
7 | 1, 6 | mgpplusg 19245 | . 2 ⊢ · = (+g‘(mulGrp‘𝑅)) |
8 | 2, 6 | ringideu 19317 | . . 3 ⊢ (𝑅 ∈ Ring → ∃!𝑦 ∈ 𝐵 ∀𝑥 ∈ 𝐵 ((𝑦 · 𝑥) = 𝑥 ∧ (𝑥 · 𝑦) = 𝑥)) |
9 | reurex 3433 | . . 3 ⊢ (∃!𝑦 ∈ 𝐵 ∀𝑥 ∈ 𝐵 ((𝑦 · 𝑥) = 𝑥 ∧ (𝑥 · 𝑦) = 𝑥) → ∃𝑦 ∈ 𝐵 ∀𝑥 ∈ 𝐵 ((𝑦 · 𝑥) = 𝑥 ∧ (𝑥 · 𝑦) = 𝑥)) | |
10 | 8, 9 | syl 17 | . 2 ⊢ (𝑅 ∈ Ring → ∃𝑦 ∈ 𝐵 ∀𝑥 ∈ 𝐵 ((𝑦 · 𝑥) = 𝑥 ∧ (𝑥 · 𝑦) = 𝑥)) |
11 | 3, 5, 7, 10 | ismgmid 17877 | 1 ⊢ (𝑅 ∈ Ring → ((𝐼 ∈ 𝐵 ∧ ∀𝑥 ∈ 𝐵 ((𝐼 · 𝑥) = 𝑥 ∧ (𝑥 · 𝐼) = 𝑥)) ↔ 1 = 𝐼)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ∀wral 3140 ∃wrex 3141 ∃!wreu 3142 ‘cfv 6357 (class class class)co 7158 Basecbs 16485 .rcmulr 16568 mulGrpcmgp 19241 1rcur 19253 Ringcrg 19299 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-cnex 10595 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rmo 3148 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-iun 4923 df-br 5069 df-opab 5131 df-mpt 5149 df-tr 5175 df-id 5462 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-we 5518 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-pred 6150 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-om 7583 df-wrecs 7949 df-recs 8010 df-rdg 8048 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-nn 11641 df-2 11703 df-ndx 16488 df-slot 16489 df-base 16491 df-sets 16492 df-plusg 16580 df-0g 16717 df-mgm 17854 df-sgrp 17903 df-mnd 17914 df-mgp 19242 df-ur 19254 df-ring 19301 |
This theorem is referenced by: imasring 19371 subrg1 19547 psr1 20194 cnfld1 20572 mat1 21058 erng1lem 38125 erngdvlem4-rN 38137 |
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