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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 7387 | . . . . . 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 20370 | . . . 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 17186 | . . . . . . 7 ⊢ ∅ = (Base‘∅) | |
| 15 | eqid 2737 | . . . . . . 7 ⊢ (invg‘∅) = (invg‘∅) | |
| 16 | 14, 15 | grpinvfn 18959 | . . . . . 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 7384 | . . . . . . 7 ⊢ (¬ 𝑅 ∈ V → ((mulGrp‘𝑅) ↾s 𝑈) = (∅ ↾s 𝑈)) |
| 22 | 7, 21 | eqtrid 2784 | . . . . . 6 ⊢ (¬ 𝑅 ∈ V → 𝐺 = (∅ ↾s 𝑈)) |
| 23 | ress0 17215 | . . . . . 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 3430 ∅c0 4274 Fn wfn 6495 ‘cfv 6500 (class class class)co 7369 ↾s cress 17202 invgcminusg 18912 mulGrpcmgp 20123 Unitcui 20337 invrcinvr 20369 |
| 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 5232 ax-nul 5242 ax-pow 5308 ax-pr 5376 ax-un 7691 ax-cnex 11096 ax-1cn 11098 ax-addcl 11100 |
| 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 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 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 7326 df-ov 7372 df-oprab 7373 df-mpo 7374 df-om 7820 df-2nd 7945 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-nn 12177 df-slot 17154 df-ndx 17166 df-base 17182 df-ress 17203 df-minusg 18915 df-invr 20370 |
| This theorem is referenced by: unitinvcl 20372 unitinvinv 20373 unitlinv 20375 unitrinv 20376 rdivmuldivd 20395 invrpropd 20400 subrgugrp 20570 cntzsdrg 20781 cnmsubglem 21412 psgninv 21564 invrvald 22643 invrcn2 24147 nrginvrcn 24659 nrgtdrg 24660 sum2dchr 27239 ringinvval 33298 dvrcan5 33299 |
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