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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 6756 | . . . . . . 7 ⊢ (𝑟 = 𝑅 → (mulGrp‘𝑟) = (mulGrp‘𝑅)) | |
3 | fveq2 6756 | . . . . . . . 8 ⊢ (𝑟 = 𝑅 → (Unit‘𝑟) = (Unit‘𝑅)) | |
4 | invrfval.u | . . . . . . . 8 ⊢ 𝑈 = (Unit‘𝑅) | |
5 | 3, 4 | eqtr4di 2797 | . . . . . . 7 ⊢ (𝑟 = 𝑅 → (Unit‘𝑟) = 𝑈) |
6 | 2, 5 | oveq12d 7273 | . . . . . 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 2797 | . . . . 5 ⊢ (𝑟 = 𝑅 → ((mulGrp‘𝑟) ↾s (Unit‘𝑟)) = 𝐺) |
9 | 8 | fveq2d 6760 | . . . 4 ⊢ (𝑟 = 𝑅 → (invg‘((mulGrp‘𝑟) ↾s (Unit‘𝑟))) = (invg‘𝐺)) |
10 | df-invr 19829 | . . . 4 ⊢ invr = (𝑟 ∈ V ↦ (invg‘((mulGrp‘𝑟) ↾s (Unit‘𝑟)))) | |
11 | fvex 6769 | . . . 4 ⊢ (invg‘𝐺) ∈ V | |
12 | 9, 10, 11 | fvmpt 6857 | . . 3 ⊢ (𝑅 ∈ V → (invr‘𝑅) = (invg‘𝐺)) |
13 | fvprc 6748 | . . . . 5 ⊢ (¬ 𝑅 ∈ V → (invr‘𝑅) = ∅) | |
14 | base0 16845 | . . . . . . 7 ⊢ ∅ = (Base‘∅) | |
15 | eqid 2738 | . . . . . . 7 ⊢ (invg‘∅) = (invg‘∅) | |
16 | 14, 15 | grpinvfn 18536 | . . . . . 6 ⊢ (invg‘∅) Fn ∅ |
17 | fn0 6548 | . . . . . 6 ⊢ ((invg‘∅) Fn ∅ ↔ (invg‘∅) = ∅) | |
18 | 16, 17 | mpbi 229 | . . . . 5 ⊢ (invg‘∅) = ∅ |
19 | 13, 18 | eqtr4di 2797 | . . . 4 ⊢ (¬ 𝑅 ∈ V → (invr‘𝑅) = (invg‘∅)) |
20 | fvprc 6748 | . . . . . . . 8 ⊢ (¬ 𝑅 ∈ V → (mulGrp‘𝑅) = ∅) | |
21 | 20 | oveq1d 7270 | . . . . . . 7 ⊢ (¬ 𝑅 ∈ V → ((mulGrp‘𝑅) ↾s 𝑈) = (∅ ↾s 𝑈)) |
22 | 7, 21 | eqtrid 2790 | . . . . . 6 ⊢ (¬ 𝑅 ∈ V → 𝐺 = (∅ ↾s 𝑈)) |
23 | ress0 16879 | . . . . . 6 ⊢ (∅ ↾s 𝑈) = ∅ | |
24 | 22, 23 | eqtrdi 2795 | . . . . 5 ⊢ (¬ 𝑅 ∈ V → 𝐺 = ∅) |
25 | 24 | fveq2d 6760 | . . . 4 ⊢ (¬ 𝑅 ∈ V → (invg‘𝐺) = (invg‘∅)) |
26 | 19, 25 | eqtr4d 2781 | . . 3 ⊢ (¬ 𝑅 ∈ V → (invr‘𝑅) = (invg‘𝐺)) |
27 | 12, 26 | pm2.61i 182 | . 2 ⊢ (invr‘𝑅) = (invg‘𝐺) |
28 | 1, 27 | eqtri 2766 | 1 ⊢ 𝐼 = (invg‘𝐺) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 = wceq 1539 ∈ wcel 2108 Vcvv 3422 ∅c0 4253 Fn wfn 6413 ‘cfv 6418 (class class class)co 7255 ↾s cress 16867 invgcminusg 18493 mulGrpcmgp 19635 Unitcui 19796 invrcinvr 19828 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-1cn 10860 ax-addcl 10862 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-ral 3068 df-rex 3069 df-reu 3070 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-nn 11904 df-slot 16811 df-ndx 16823 df-base 16841 df-ress 16868 df-minusg 18496 df-invr 19829 |
This theorem is referenced by: unitinvcl 19831 unitinvinv 19832 unitlinv 19834 unitrinv 19835 invrpropd 19855 subrgugrp 19958 cntzsdrg 19985 cnmsubglem 20573 psgninv 20699 invrvald 21733 invrcn2 23239 nrginvrcn 23762 nrgtdrg 23763 sum2dchr 26327 rdivmuldivd 31390 ringinvval 31391 dvrcan5 31392 |
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