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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 2232 | . . . . . . 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 14180 | . . . . . 6 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ SRing) | |
| 6 | 2, 4, 5 | unitgrpbasd 14249 | . . . . 5 ⊢ (𝑅 ∈ Ring → 𝑈 = (Base‘((mulGrp‘𝑅) ↾s 𝑈))) |
| 7 | 6 | eleq2d 2302 | . . . 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 14250 | . . . 4 ⊢ (𝑅 ∈ Ring → ((mulGrp‘𝑅) ↾s 𝑈) ∈ Grp) |
| 10 | eqid 2232 | . . . . 5 ⊢ (Base‘((mulGrp‘𝑅) ↾s 𝑈)) = (Base‘((mulGrp‘𝑅) ↾s 𝑈)) | |
| 11 | eqid 2232 | . . . . 5 ⊢ (invg‘((mulGrp‘𝑅) ↾s 𝑈)) = (invg‘((mulGrp‘𝑅) ↾s 𝑈)) | |
| 12 | 10, 11 | grpinvcl 13750 | . . . 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 14256 | . . . . 5 ⊢ (𝑅 ∈ Ring → 𝐼 = (invg‘((mulGrp‘𝑅) ↾s 𝑈))) |
| 19 | 18 | fveq1d 5671 | . . . 4 ⊢ (𝑅 ∈ Ring → (𝐼‘𝑋) = ((invg‘((mulGrp‘𝑅) ↾s 𝑈))‘𝑋)) |
| 20 | 19, 6 | eleq12d 2303 | . . 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 1398 ∈ wcel 2203 ‘cfv 5351 (class class class)co 6049 Basecbs 13201 ↾s cress 13202 Grpcgrp 13702 invgcminusg 13703 mulGrpcmgp 14053 Ringcrg 14129 Unitcui 14220 invrcinvr 14254 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-coll 4224 ax-sep 4227 ax-nul 4235 ax-pow 4286 ax-pr 4321 ax-un 4553 ax-setind 4658 ax-cnex 8214 ax-resscn 8215 ax-1cn 8216 ax-1re 8217 ax-icn 8218 ax-addcl 8219 ax-addrcl 8220 ax-mulcl 8221 ax-addcom 8223 ax-addass 8225 ax-i2m1 8228 ax-0lt1 8229 ax-0id 8231 ax-rnegex 8232 ax-pre-ltirr 8235 ax-pre-lttrn 8237 ax-pre-ltadd 8239 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-ral 2525 df-rex 2526 df-reu 2527 df-rmo 2528 df-rab 2529 df-v 2814 df-sbc 3042 df-csb 3138 df-dif 3212 df-un 3214 df-in 3216 df-ss 3223 df-nul 3508 df-pw 3670 df-sn 3694 df-pr 3695 df-op 3697 df-uni 3914 df-int 3949 df-iun 3992 df-br 4109 df-opab 4171 df-mpt 4172 df-id 4413 df-xp 4754 df-rel 4755 df-cnv 4756 df-co 4757 df-dm 4758 df-rn 4759 df-res 4760 df-ima 4761 df-iota 5311 df-fun 5353 df-fn 5354 df-f 5355 df-f1 5356 df-fo 5357 df-f1o 5358 df-fv 5359 df-riota 6002 df-ov 6052 df-oprab 6053 df-mpo 6054 df-tpos 6475 df-pnf 8306 df-mnf 8307 df-ltxr 8309 df-inn 9234 df-2 9292 df-3 9293 df-ndx 13204 df-slot 13205 df-base 13207 df-sets 13208 df-iress 13209 df-plusg 13292 df-mulr 13293 df-0g 13460 df-mgm 13558 df-sgrp 13604 df-mnd 13619 df-grp 13705 df-minusg 13706 df-cmn 13992 df-abl 13993 df-mgp 14054 df-ur 14093 df-srg 14097 df-ring 14131 df-oppr 14201 df-dvdsr 14222 df-unit 14223 df-invr 14255 |
| This theorem is referenced by: ringinvcl 14259 dvrvald 14268 unitdvcl 14270 dvrdir 14277 rdivmuldivd 14278 rhmunitinv 14312 subrguss 14370 subrgugrp 14374 |
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