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| Mirrors > Home > ILE Home > Th. List > unitinvcl | GIF version | ||
| Description: The inverse of a unit exists and is a unit. (Contributed by Mario Carneiro, 2-Dec-2014.) |
| Ref | Expression |
|---|---|
| unitinvcl.1 | ⊢ 𝑈 = (Unit‘𝑅) |
| unitinvcl.2 | ⊢ 𝐼 = (invr‘𝑅) |
| Ref | Expression |
|---|---|
| unitinvcl | ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝑈) → (𝐼‘𝑋) ∈ 𝑈) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | unitinvcl.1 | . . . . . . 7 ⊢ 𝑈 = (Unit‘𝑅) | |
| 2 | 1 | a1i 9 | . . . . . 6 ⊢ (𝑅 ∈ Ring → 𝑈 = (Unit‘𝑅)) |
| 3 | eqid 2230 | . . . . . . 7 ⊢ ((mulGrp‘𝑅) ↾s 𝑈) = ((mulGrp‘𝑅) ↾s 𝑈) | |
| 4 | 3 | a1i 9 | . . . . . 6 ⊢ (𝑅 ∈ Ring → ((mulGrp‘𝑅) ↾s 𝑈) = ((mulGrp‘𝑅) ↾s 𝑈)) |
| 5 | ringsrg 14084 | . . . . . 6 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ SRing) | |
| 6 | 2, 4, 5 | unitgrpbasd 14153 | . . . . 5 ⊢ (𝑅 ∈ Ring → 𝑈 = (Base‘((mulGrp‘𝑅) ↾s 𝑈))) |
| 7 | 6 | eleq2d 2300 | . . . 4 ⊢ (𝑅 ∈ Ring → (𝑋 ∈ 𝑈 ↔ 𝑋 ∈ (Base‘((mulGrp‘𝑅) ↾s 𝑈)))) |
| 8 | 7 | pm5.32i 454 | . . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝑈) ↔ (𝑅 ∈ Ring ∧ 𝑋 ∈ (Base‘((mulGrp‘𝑅) ↾s 𝑈)))) |
| 9 | 1, 3 | unitgrp 14154 | . . . 4 ⊢ (𝑅 ∈ Ring → ((mulGrp‘𝑅) ↾s 𝑈) ∈ Grp) |
| 10 | eqid 2230 | . . . . 5 ⊢ (Base‘((mulGrp‘𝑅) ↾s 𝑈)) = (Base‘((mulGrp‘𝑅) ↾s 𝑈)) | |
| 11 | eqid 2230 | . . . . 5 ⊢ (invg‘((mulGrp‘𝑅) ↾s 𝑈)) = (invg‘((mulGrp‘𝑅) ↾s 𝑈)) | |
| 12 | 10, 11 | grpinvcl 13654 | . . . 4 ⊢ ((((mulGrp‘𝑅) ↾s 𝑈) ∈ Grp ∧ 𝑋 ∈ (Base‘((mulGrp‘𝑅) ↾s 𝑈))) → ((invg‘((mulGrp‘𝑅) ↾s 𝑈))‘𝑋) ∈ (Base‘((mulGrp‘𝑅) ↾s 𝑈))) |
| 13 | 9, 12 | sylan 283 | . . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ (Base‘((mulGrp‘𝑅) ↾s 𝑈))) → ((invg‘((mulGrp‘𝑅) ↾s 𝑈))‘𝑋) ∈ (Base‘((mulGrp‘𝑅) ↾s 𝑈))) |
| 14 | 8, 13 | sylbi 121 | . 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝑈) → ((invg‘((mulGrp‘𝑅) ↾s 𝑈))‘𝑋) ∈ (Base‘((mulGrp‘𝑅) ↾s 𝑈))) |
| 15 | unitinvcl.2 | . . . . . . 7 ⊢ 𝐼 = (invr‘𝑅) | |
| 16 | 15 | a1i 9 | . . . . . 6 ⊢ (𝑅 ∈ Ring → 𝐼 = (invr‘𝑅)) |
| 17 | id 19 | . . . . . 6 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Ring) | |
| 18 | 2, 4, 16, 17 | invrfvald 14160 | . . . . 5 ⊢ (𝑅 ∈ Ring → 𝐼 = (invg‘((mulGrp‘𝑅) ↾s 𝑈))) |
| 19 | 18 | fveq1d 5644 | . . . 4 ⊢ (𝑅 ∈ Ring → (𝐼‘𝑋) = ((invg‘((mulGrp‘𝑅) ↾s 𝑈))‘𝑋)) |
| 20 | 19, 6 | eleq12d 2301 | . . 3 ⊢ (𝑅 ∈ Ring → ((𝐼‘𝑋) ∈ 𝑈 ↔ ((invg‘((mulGrp‘𝑅) ↾s 𝑈))‘𝑋) ∈ (Base‘((mulGrp‘𝑅) ↾s 𝑈)))) |
| 21 | 20 | adantr 276 | . 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝑈) → ((𝐼‘𝑋) ∈ 𝑈 ↔ ((invg‘((mulGrp‘𝑅) ↾s 𝑈))‘𝑋) ∈ (Base‘((mulGrp‘𝑅) ↾s 𝑈)))) |
| 22 | 14, 21 | mpbird 167 | 1 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝑈) → (𝐼‘𝑋) ∈ 𝑈) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1397 ∈ wcel 2201 ‘cfv 5328 (class class class)co 6023 Basecbs 13105 ↾s cress 13106 Grpcgrp 13606 invgcminusg 13607 mulGrpcmgp 13957 Ringcrg 14033 Unitcui 14124 invrcinvr 14158 |
| 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 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2203 ax-14 2204 ax-ext 2212 ax-coll 4205 ax-sep 4208 ax-nul 4216 ax-pow 4266 ax-pr 4301 ax-un 4532 ax-setind 4637 ax-cnex 8128 ax-resscn 8129 ax-1cn 8130 ax-1re 8131 ax-icn 8132 ax-addcl 8133 ax-addrcl 8134 ax-mulcl 8135 ax-addcom 8137 ax-addass 8139 ax-i2m1 8142 ax-0lt1 8143 ax-0id 8145 ax-rnegex 8146 ax-pre-ltirr 8149 ax-pre-lttrn 8151 ax-pre-ltadd 8153 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1810 df-eu 2081 df-mo 2082 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ne 2402 df-nel 2497 df-ral 2514 df-rex 2515 df-reu 2516 df-rmo 2517 df-rab 2518 df-v 2803 df-sbc 3031 df-csb 3127 df-dif 3201 df-un 3203 df-in 3205 df-ss 3212 df-nul 3494 df-pw 3655 df-sn 3676 df-pr 3677 df-op 3679 df-uni 3895 df-int 3930 df-iun 3973 df-br 4090 df-opab 4152 df-mpt 4153 df-id 4392 df-xp 4733 df-rel 4734 df-cnv 4735 df-co 4736 df-dm 4737 df-rn 4738 df-res 4739 df-ima 4740 df-iota 5288 df-fun 5330 df-fn 5331 df-f 5332 df-f1 5333 df-fo 5334 df-f1o 5335 df-fv 5336 df-riota 5976 df-ov 6026 df-oprab 6027 df-mpo 6028 df-tpos 6416 df-pnf 8221 df-mnf 8222 df-ltxr 8224 df-inn 9149 df-2 9207 df-3 9208 df-ndx 13108 df-slot 13109 df-base 13111 df-sets 13112 df-iress 13113 df-plusg 13196 df-mulr 13197 df-0g 13364 df-mgm 13462 df-sgrp 13508 df-mnd 13523 df-grp 13609 df-minusg 13610 df-cmn 13896 df-abl 13897 df-mgp 13958 df-ur 13997 df-srg 14001 df-ring 14035 df-oppr 14105 df-dvdsr 14126 df-unit 14127 df-invr 14159 |
| This theorem is referenced by: ringinvcl 14163 dvrvald 14172 unitdvcl 14174 dvrdir 14181 rdivmuldivd 14182 rhmunitinv 14216 subrguss 14274 subrgugrp 14278 |
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