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Mirrors > Home > ILE Home > Th. List > 0unit | GIF version |
Description: The additive identity is a unit if and only if 1 = 0, i.e. we are in the zero ring. (Contributed by Mario Carneiro, 4-Dec-2014.) |
Ref | Expression |
---|---|
0unit.1 | ⊢ 𝑈 = (Unit‘𝑅) |
0unit.2 | ⊢ 0 = (0g‘𝑅) |
0unit.3 | ⊢ 1 = (1r‘𝑅) |
Ref | Expression |
---|---|
0unit | ⊢ (𝑅 ∈ Ring → ( 0 ∈ 𝑈 ↔ 1 = 0 )) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0unit.1 | . . . 4 ⊢ 𝑈 = (Unit‘𝑅) | |
2 | eqid 2177 | . . . 4 ⊢ (invr‘𝑅) = (invr‘𝑅) | |
3 | eqid 2177 | . . . 4 ⊢ (.r‘𝑅) = (.r‘𝑅) | |
4 | 0unit.3 | . . . 4 ⊢ 1 = (1r‘𝑅) | |
5 | 1, 2, 3, 4 | unitrinv 13249 | . . 3 ⊢ ((𝑅 ∈ Ring ∧ 0 ∈ 𝑈) → ( 0 (.r‘𝑅)((invr‘𝑅)‘ 0 )) = 1 ) |
6 | eqid 2177 | . . . . 5 ⊢ (Base‘𝑅) = (Base‘𝑅) | |
7 | 1, 2, 6 | ringinvcl 13247 | . . . 4 ⊢ ((𝑅 ∈ Ring ∧ 0 ∈ 𝑈) → ((invr‘𝑅)‘ 0 ) ∈ (Base‘𝑅)) |
8 | 0unit.2 | . . . . 5 ⊢ 0 = (0g‘𝑅) | |
9 | 6, 3, 8 | ringlz 13175 | . . . 4 ⊢ ((𝑅 ∈ Ring ∧ ((invr‘𝑅)‘ 0 ) ∈ (Base‘𝑅)) → ( 0 (.r‘𝑅)((invr‘𝑅)‘ 0 )) = 0 ) |
10 | 7, 9 | syldan 282 | . . 3 ⊢ ((𝑅 ∈ Ring ∧ 0 ∈ 𝑈) → ( 0 (.r‘𝑅)((invr‘𝑅)‘ 0 )) = 0 ) |
11 | 5, 10 | eqtr3d 2212 | . 2 ⊢ ((𝑅 ∈ Ring ∧ 0 ∈ 𝑈) → 1 = 0 ) |
12 | simpr 110 | . . 3 ⊢ ((𝑅 ∈ Ring ∧ 1 = 0 ) → 1 = 0 ) | |
13 | 1, 4 | 1unit 13229 | . . . 4 ⊢ (𝑅 ∈ Ring → 1 ∈ 𝑈) |
14 | 13 | adantr 276 | . . 3 ⊢ ((𝑅 ∈ Ring ∧ 1 = 0 ) → 1 ∈ 𝑈) |
15 | 12, 14 | eqeltrrd 2255 | . 2 ⊢ ((𝑅 ∈ Ring ∧ 1 = 0 ) → 0 ∈ 𝑈) |
16 | 11, 15 | impbida 596 | 1 ⊢ (𝑅 ∈ Ring → ( 0 ∈ 𝑈 ↔ 1 = 0 )) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1353 ∈ wcel 2148 ‘cfv 5216 (class class class)co 5874 Basecbs 12456 .rcmulr 12531 0gc0g 12695 1rcur 13095 Ringcrg 13132 Unitcui 13209 invrcinvr 13242 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-coll 4118 ax-sep 4121 ax-nul 4129 ax-pow 4174 ax-pr 4209 ax-un 4433 ax-setind 4536 ax-cnex 7901 ax-resscn 7902 ax-1cn 7903 ax-1re 7904 ax-icn 7905 ax-addcl 7906 ax-addrcl 7907 ax-mulcl 7908 ax-addcom 7910 ax-addass 7912 ax-i2m1 7915 ax-0lt1 7916 ax-0id 7918 ax-rnegex 7919 ax-pre-ltirr 7922 ax-pre-lttrn 7924 ax-pre-ltadd 7926 |
This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-reu 2462 df-rmo 2463 df-rab 2464 df-v 2739 df-sbc 2963 df-csb 3058 df-dif 3131 df-un 3133 df-in 3135 df-ss 3142 df-nul 3423 df-pw 3577 df-sn 3598 df-pr 3599 df-op 3601 df-uni 3810 df-int 3845 df-iun 3888 df-br 4004 df-opab 4065 df-mpt 4066 df-id 4293 df-xp 4632 df-rel 4633 df-cnv 4634 df-co 4635 df-dm 4636 df-rn 4637 df-res 4638 df-ima 4639 df-iota 5178 df-fun 5218 df-fn 5219 df-f 5220 df-f1 5221 df-fo 5222 df-f1o 5223 df-fv 5224 df-riota 5830 df-ov 5877 df-oprab 5878 df-mpo 5879 df-tpos 6245 df-pnf 7992 df-mnf 7993 df-ltxr 7995 df-inn 8918 df-2 8976 df-3 8977 df-ndx 12459 df-slot 12460 df-base 12462 df-sets 12463 df-iress 12464 df-plusg 12543 df-mulr 12544 df-0g 12697 df-mgm 12729 df-sgrp 12762 df-mnd 12772 df-grp 12834 df-minusg 12835 df-cmn 13043 df-abl 13044 df-mgp 13084 df-ur 13096 df-srg 13100 df-ring 13134 df-oppr 13193 df-dvdsr 13211 df-unit 13212 df-invr 13243 |
This theorem is referenced by: nzrunit 13282 aprirr 13294 |
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