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| Mirrors > Home > MPE Home > Th. List > invrfval | Structured version Visualization version GIF version | ||
| Description: Multiplicative inverse function for a division ring. (Contributed by NM, 21-Sep-2011.) (Revised by Mario Carneiro, 25-Dec-2014.) |
| Ref | Expression |
|---|---|
| invrfval.u | ⊢ 𝑈 = (Unit‘𝑅) |
| invrfval.g | ⊢ 𝐺 = ((mulGrp‘𝑅) ↾s 𝑈) |
| invrfval.i | ⊢ 𝐼 = (invr‘𝑅) |
| Ref | Expression |
|---|---|
| invrfval | ⊢ 𝐼 = (invg‘𝐺) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | invrfval.i | . 2 ⊢ 𝐼 = (invr‘𝑅) | |
| 2 | fveq2 6842 | . . . . . . 7 ⊢ (𝑟 = 𝑅 → (mulGrp‘𝑟) = (mulGrp‘𝑅)) | |
| 3 | fveq2 6842 | . . . . . . . 8 ⊢ (𝑟 = 𝑅 → (Unit‘𝑟) = (Unit‘𝑅)) | |
| 4 | invrfval.u | . . . . . . . 8 ⊢ 𝑈 = (Unit‘𝑅) | |
| 5 | 3, 4 | eqtr4di 2790 | . . . . . . 7 ⊢ (𝑟 = 𝑅 → (Unit‘𝑟) = 𝑈) |
| 6 | 2, 5 | oveq12d 7386 | . . . . . 6 ⊢ (𝑟 = 𝑅 → ((mulGrp‘𝑟) ↾s (Unit‘𝑟)) = ((mulGrp‘𝑅) ↾s 𝑈)) |
| 7 | invrfval.g | . . . . . 6 ⊢ 𝐺 = ((mulGrp‘𝑅) ↾s 𝑈) | |
| 8 | 6, 7 | eqtr4di 2790 | . . . . 5 ⊢ (𝑟 = 𝑅 → ((mulGrp‘𝑟) ↾s (Unit‘𝑟)) = 𝐺) |
| 9 | 8 | fveq2d 6846 | . . . 4 ⊢ (𝑟 = 𝑅 → (invg‘((mulGrp‘𝑟) ↾s (Unit‘𝑟))) = (invg‘𝐺)) |
| 10 | df-invr 20336 | . . . 4 ⊢ invr = (𝑟 ∈ V ↦ (invg‘((mulGrp‘𝑟) ↾s (Unit‘𝑟)))) | |
| 11 | fvex 6855 | . . . 4 ⊢ (invg‘𝐺) ∈ V | |
| 12 | 9, 10, 11 | fvmpt 6949 | . . 3 ⊢ (𝑅 ∈ V → (invr‘𝑅) = (invg‘𝐺)) |
| 13 | fvprc 6834 | . . . . 5 ⊢ (¬ 𝑅 ∈ V → (invr‘𝑅) = ∅) | |
| 14 | base0 17153 | . . . . . . 7 ⊢ ∅ = (Base‘∅) | |
| 15 | eqid 2737 | . . . . . . 7 ⊢ (invg‘∅) = (invg‘∅) | |
| 16 | 14, 15 | grpinvfn 18923 | . . . . . 6 ⊢ (invg‘∅) Fn ∅ |
| 17 | fn0 6631 | . . . . . 6 ⊢ ((invg‘∅) Fn ∅ ↔ (invg‘∅) = ∅) | |
| 18 | 16, 17 | mpbi 230 | . . . . 5 ⊢ (invg‘∅) = ∅ |
| 19 | 13, 18 | eqtr4di 2790 | . . . 4 ⊢ (¬ 𝑅 ∈ V → (invr‘𝑅) = (invg‘∅)) |
| 20 | fvprc 6834 | . . . . . . . 8 ⊢ (¬ 𝑅 ∈ V → (mulGrp‘𝑅) = ∅) | |
| 21 | 20 | oveq1d 7383 | . . . . . . 7 ⊢ (¬ 𝑅 ∈ V → ((mulGrp‘𝑅) ↾s 𝑈) = (∅ ↾s 𝑈)) |
| 22 | 7, 21 | eqtrid 2784 | . . . . . 6 ⊢ (¬ 𝑅 ∈ V → 𝐺 = (∅ ↾s 𝑈)) |
| 23 | ress0 17182 | . . . . . 6 ⊢ (∅ ↾s 𝑈) = ∅ | |
| 24 | 22, 23 | eqtrdi 2788 | . . . . 5 ⊢ (¬ 𝑅 ∈ V → 𝐺 = ∅) |
| 25 | 24 | fveq2d 6846 | . . . 4 ⊢ (¬ 𝑅 ∈ V → (invg‘𝐺) = (invg‘∅)) |
| 26 | 19, 25 | eqtr4d 2775 | . . 3 ⊢ (¬ 𝑅 ∈ V → (invr‘𝑅) = (invg‘𝐺)) |
| 27 | 12, 26 | pm2.61i 182 | . 2 ⊢ (invr‘𝑅) = (invg‘𝐺) |
| 28 | 1, 27 | eqtri 2760 | 1 ⊢ 𝐼 = (invg‘𝐺) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 = wceq 1542 ∈ wcel 2114 Vcvv 3442 ∅c0 4287 Fn wfn 6495 ‘cfv 6500 (class class class)co 7368 ↾s cress 17169 invgcminusg 18876 mulGrpcmgp 20087 Unitcui 20303 invrcinvr 20335 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-1cn 11096 ax-addcl 11098 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-om 7819 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-nn 12158 df-slot 17121 df-ndx 17133 df-base 17149 df-ress 17170 df-minusg 18879 df-invr 20336 |
| This theorem is referenced by: unitinvcl 20338 unitinvinv 20339 unitlinv 20341 unitrinv 20342 rdivmuldivd 20361 invrpropd 20366 subrgugrp 20536 cntzsdrg 20747 cnmsubglem 21397 psgninv 21549 invrvald 22632 invrcn2 24136 nrginvrcn 24648 nrgtdrg 24649 sum2dchr 27253 ringinvval 33328 dvrcan5 33329 |
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