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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 2234 | . . . . . . 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 14208 | . . . . . 6 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ SRing) | |
| 6 | 2, 4, 5 | unitgrpbasd 14277 | . . . . 5 ⊢ (𝑅 ∈ Ring → 𝑈 = (Base‘((mulGrp‘𝑅) ↾s 𝑈))) |
| 7 | 6 | eleq2d 2304 | . . . 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 14278 | . . . 4 ⊢ (𝑅 ∈ Ring → ((mulGrp‘𝑅) ↾s 𝑈) ∈ Grp) |
| 10 | eqid 2234 | . . . . 5 ⊢ (Base‘((mulGrp‘𝑅) ↾s 𝑈)) = (Base‘((mulGrp‘𝑅) ↾s 𝑈)) | |
| 11 | eqid 2234 | . . . . 5 ⊢ (invg‘((mulGrp‘𝑅) ↾s 𝑈)) = (invg‘((mulGrp‘𝑅) ↾s 𝑈)) | |
| 12 | 10, 11 | grpinvcl 13778 | . . . 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 14284 | . . . . 5 ⊢ (𝑅 ∈ Ring → 𝐼 = (invg‘((mulGrp‘𝑅) ↾s 𝑈))) |
| 19 | 18 | fveq1d 5674 | . . . 4 ⊢ (𝑅 ∈ Ring → (𝐼‘𝑋) = ((invg‘((mulGrp‘𝑅) ↾s 𝑈))‘𝑋)) |
| 20 | 19, 6 | eleq12d 2305 | . . 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 2205 ‘cfv 5354 (class class class)co 6052 Basecbs 13229 ↾s cress 13230 Grpcgrp 13730 invgcminusg 13731 mulGrpcmgp 14081 Ringcrg 14157 Unitcui 14248 invrcinvr 14282 |
| 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 2207 ax-14 2208 ax-ext 2216 ax-coll 4227 ax-sep 4230 ax-nul 4238 ax-pow 4289 ax-pr 4324 ax-un 4556 ax-setind 4661 ax-cnex 8220 ax-resscn 8221 ax-1cn 8222 ax-1re 8223 ax-icn 8224 ax-addcl 8225 ax-addrcl 8226 ax-mulcl 8227 ax-addcom 8229 ax-addass 8231 ax-i2m1 8234 ax-0lt1 8235 ax-0id 8237 ax-rnegex 8238 ax-pre-ltirr 8241 ax-pre-lttrn 8243 ax-pre-ltadd 8245 |
| 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 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-ral 2527 df-rex 2528 df-reu 2529 df-rmo 2530 df-rab 2531 df-v 2817 df-sbc 3045 df-csb 3141 df-dif 3215 df-un 3217 df-in 3219 df-ss 3226 df-nul 3511 df-pw 3673 df-sn 3697 df-pr 3698 df-op 3700 df-uni 3917 df-int 3952 df-iun 3995 df-br 4112 df-opab 4174 df-mpt 4175 df-id 4416 df-xp 4757 df-rel 4758 df-cnv 4759 df-co 4760 df-dm 4761 df-rn 4762 df-res 4763 df-ima 4764 df-iota 5314 df-fun 5356 df-fn 5357 df-f 5358 df-f1 5359 df-fo 5360 df-f1o 5361 df-fv 5362 df-riota 6005 df-ov 6055 df-oprab 6056 df-mpo 6057 df-tpos 6478 df-pnf 8312 df-mnf 8313 df-ltxr 8315 df-inn 9240 df-2 9298 df-3 9299 df-ndx 13232 df-slot 13233 df-base 13235 df-sets 13236 df-iress 13237 df-plusg 13320 df-mulr 13321 df-0g 13488 df-mgm 13586 df-sgrp 13632 df-mnd 13647 df-grp 13733 df-minusg 13734 df-cmn 14020 df-abl 14021 df-mgp 14082 df-ur 14121 df-srg 14125 df-ring 14159 df-oppr 14229 df-dvdsr 14250 df-unit 14251 df-invr 14283 |
| This theorem is referenced by: ringinvcl 14287 dvrvald 14296 unitdvcl 14298 dvrdir 14305 rdivmuldivd 14306 rhmunitinv 14340 subrguss 14398 subrgugrp 14402 |
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