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| Mirrors > Home > ILE Home > Th. List > invrfvald | GIF version | ||
| Description: Multiplicative inverse function for a ring. (Contributed by NM, 21-Sep-2011.) (Revised by Mario Carneiro, 25-Dec-2014.) |
| Ref | Expression |
|---|---|
| invrfvald.u | ⊢ (𝜑 → 𝑈 = (Unit‘𝑅)) |
| invrfvald.g | ⊢ (𝜑 → 𝐺 = ((mulGrp‘𝑅) ↾s 𝑈)) |
| invrfvald.i | ⊢ (𝜑 → 𝐼 = (invr‘𝑅)) |
| invrfvald.r | ⊢ (𝜑 → 𝑅 ∈ Ring) |
| Ref | Expression |
|---|---|
| invrfvald | ⊢ (𝜑 → 𝐼 = (invg‘𝐺)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | invrfvald.u | . . . 4 ⊢ (𝜑 → 𝑈 = (Unit‘𝑅)) | |
| 2 | 1 | oveq2d 6104 | . . 3 ⊢ (𝜑 → ((mulGrp‘𝑅) ↾s 𝑈) = ((mulGrp‘𝑅) ↾s (Unit‘𝑅))) |
| 3 | 2 | fveq2d 5702 | . 2 ⊢ (𝜑 → (invg‘((mulGrp‘𝑅) ↾s 𝑈)) = (invg‘((mulGrp‘𝑅) ↾s (Unit‘𝑅)))) |
| 4 | invrfvald.g | . . 3 ⊢ (𝜑 → 𝐺 = ((mulGrp‘𝑅) ↾s 𝑈)) | |
| 5 | 4 | fveq2d 5702 | . 2 ⊢ (𝜑 → (invg‘𝐺) = (invg‘((mulGrp‘𝑅) ↾s 𝑈))) |
| 6 | invrfvald.i | . . 3 ⊢ (𝜑 → 𝐼 = (invr‘𝑅)) | |
| 7 | df-invr 14537 | . . . 4 ⊢ invr = (𝑟 ∈ V ↦ (invg‘((mulGrp‘𝑟) ↾s (Unit‘𝑟)))) | |
| 8 | fveq2 5698 | . . . . . 6 ⊢ (𝑟 = 𝑅 → (mulGrp‘𝑟) = (mulGrp‘𝑅)) | |
| 9 | fveq2 5698 | . . . . . 6 ⊢ (𝑟 = 𝑅 → (Unit‘𝑟) = (Unit‘𝑅)) | |
| 10 | 8, 9 | oveq12d 6106 | . . . . 5 ⊢ (𝑟 = 𝑅 → ((mulGrp‘𝑟) ↾s (Unit‘𝑟)) = ((mulGrp‘𝑅) ↾s (Unit‘𝑅))) |
| 11 | 10 | fveq2d 5702 | . . . 4 ⊢ (𝑟 = 𝑅 → (invg‘((mulGrp‘𝑟) ↾s (Unit‘𝑟))) = (invg‘((mulGrp‘𝑅) ↾s (Unit‘𝑅)))) |
| 12 | invrfvald.r | . . . . 5 ⊢ (𝜑 → 𝑅 ∈ Ring) | |
| 13 | 12 | elexd 2835 | . . . 4 ⊢ (𝜑 → 𝑅 ∈ V) |
| 14 | eqid 2238 | . . . . . . . 8 ⊢ (Unit‘𝑅) = (Unit‘𝑅) | |
| 15 | eqid 2238 | . . . . . . . 8 ⊢ ((mulGrp‘𝑅) ↾s (Unit‘𝑅)) = ((mulGrp‘𝑅) ↾s (Unit‘𝑅)) | |
| 16 | 14, 15 | unitgrp 14532 | . . . . . . 7 ⊢ (𝑅 ∈ Ring → ((mulGrp‘𝑅) ↾s (Unit‘𝑅)) ∈ Grp) |
| 17 | 12, 16 | syl 14 | . . . . . 6 ⊢ (𝜑 → ((mulGrp‘𝑅) ↾s (Unit‘𝑅)) ∈ Grp) |
| 18 | eqid 2238 | . . . . . . 7 ⊢ (Base‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) = (Base‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) | |
| 19 | eqid 2238 | . . . . . . 7 ⊢ (invg‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) = (invg‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) | |
| 20 | 18, 19 | grpinvfng 13908 | . . . . . 6 ⊢ (((mulGrp‘𝑅) ↾s (Unit‘𝑅)) ∈ Grp → (invg‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) Fn (Base‘((mulGrp‘𝑅) ↾s (Unit‘𝑅)))) |
| 21 | 17, 20 | syl 14 | . . . . 5 ⊢ (𝜑 → (invg‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) Fn (Base‘((mulGrp‘𝑅) ↾s (Unit‘𝑅)))) |
| 22 | basfn 13469 | . . . . . 6 ⊢ Base Fn V | |
| 23 | 17 | elexd 2835 | . . . . . 6 ⊢ (𝜑 → ((mulGrp‘𝑅) ↾s (Unit‘𝑅)) ∈ V) |
| 24 | funfvex 5715 | . . . . . . 7 ⊢ ((Fun Base ∧ ((mulGrp‘𝑅) ↾s (Unit‘𝑅)) ∈ dom Base) → (Base‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) ∈ V) | |
| 25 | 24 | funfni 5486 | . . . . . 6 ⊢ ((Base Fn V ∧ ((mulGrp‘𝑅) ↾s (Unit‘𝑅)) ∈ V) → (Base‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) ∈ V) |
| 26 | 22, 23, 25 | sylancr 418 | . . . . 5 ⊢ (𝜑 → (Base‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) ∈ V) |
| 27 | fnex 5940 | . . . . 5 ⊢ (((invg‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) Fn (Base‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) ∧ (Base‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) ∈ V) → (invg‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) ∈ V) | |
| 28 | 21, 26, 27 | syl2anc 415 | . . . 4 ⊢ (𝜑 → (invg‘((mulGrp‘𝑅) ↾s (Unit‘𝑅))) ∈ V) |
| 29 | 7, 11, 13, 28 | fvmptd3 5802 | . . 3 ⊢ (𝜑 → (invr‘𝑅) = (invg‘((mulGrp‘𝑅) ↾s (Unit‘𝑅)))) |
| 30 | 6, 29 | eqtrd 2271 | . 2 ⊢ (𝜑 → 𝐼 = (invg‘((mulGrp‘𝑅) ↾s (Unit‘𝑅)))) |
| 31 | 3, 5, 30 | 3eqtr4rd 2282 | 1 ⊢ (𝜑 → 𝐼 = (invg‘𝐺)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 = wceq 1402 ∈ wcel 2209 Vcvv 2821 Fn wfn 5375 ‘cfv 5380 (class class class)co 6088 Basecbs 13410 ↾s cress 13411 Grpcgrp 13864 invgcminusg 13865 mulGrpcmgp 14324 Ringcrg 14407 Unitcui 14502 invrcinvr 14536 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4248 ax-sep 4251 ax-nul 4261 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 ax-cnex 8276 ax-resscn 8277 ax-1cn 8278 ax-1re 8279 ax-icn 8280 ax-addcl 8281 ax-addrcl 8282 ax-mulcl 8283 ax-addcom 8285 ax-addass 8287 ax-i2m1 8290 ax-0lt1 8291 ax-0id 8293 ax-rnegex 8294 ax-pre-ltirr 8297 ax-pre-lttrn 8299 ax-pre-ltadd 8301 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-iun 4014 df-br 4132 df-opab 4194 df-mpt 4195 df-id 4440 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-rn 4787 df-res 4788 df-ima 4789 df-iota 5340 df-fun 5382 df-fn 5383 df-f 5384 df-f1 5385 df-fo 5386 df-f1o 5387 df-fv 5388 df-riota 6041 df-ov 6091 df-oprab 6092 df-mpo 6093 df-tpos 6520 df-pnf 8368 df-mnf 8369 df-ltxr 8371 df-inn 9314 df-2 9372 df-3 9373 df-ndx 13413 df-slot 13414 df-base 13416 df-sets 13417 df-iress 13418 df-plusg 13503 df-mulr 13504 df-0g 13671 df-mgm 13735 df-sgrp 13776 df-mnd 13789 df-grp 13867 df-minusg 13868 df-cmn 14179 df-abl 14180 df-mgp 14325 df-ur 14370 df-srg 14375 df-ring 14409 df-oppr 14482 df-dvdsr 14504 df-unit 14505 df-invr 14537 |
| This theorem is used by: unitinvcl 14539 unitinvinv 14540 unitlinv 14542 unitrinv 14543 rdivmuldivd 14560 invrpropdg 14565 subrgugrp 14657 |
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