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Mirrors > Home > MPE Home > Th. List > ringidval | Structured version Visualization version GIF version |
Description: The value of the unity element of a ring. (Contributed by NM, 27-Aug-2011.) (Revised by Mario Carneiro, 27-Dec-2014.) |
Ref | Expression |
---|---|
ringidval.g | ⊢ 𝐺 = (mulGrp‘𝑅) |
ringidval.u | ⊢ 1 = (1r‘𝑅) |
Ref | Expression |
---|---|
ringidval | ⊢ 1 = (0g‘𝐺) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ur 18325 | . . . . 5 ⊢ 1r = (0g ∘ mulGrp) | |
2 | 1 | fveq1i 6104 | . . . 4 ⊢ (1r‘𝑅) = ((0g ∘ mulGrp)‘𝑅) |
3 | fnmgp 18314 | . . . . 5 ⊢ mulGrp Fn V | |
4 | fvco2 6183 | . . . . 5 ⊢ ((mulGrp Fn V ∧ 𝑅 ∈ V) → ((0g ∘ mulGrp)‘𝑅) = (0g‘(mulGrp‘𝑅))) | |
5 | 3, 4 | mpan 702 | . . . 4 ⊢ (𝑅 ∈ V → ((0g ∘ mulGrp)‘𝑅) = (0g‘(mulGrp‘𝑅))) |
6 | 2, 5 | syl5eq 2656 | . . 3 ⊢ (𝑅 ∈ V → (1r‘𝑅) = (0g‘(mulGrp‘𝑅))) |
7 | 0g0 17086 | . . . 4 ⊢ ∅ = (0g‘∅) | |
8 | fvprc 6097 | . . . 4 ⊢ (¬ 𝑅 ∈ V → (1r‘𝑅) = ∅) | |
9 | fvprc 6097 | . . . . 5 ⊢ (¬ 𝑅 ∈ V → (mulGrp‘𝑅) = ∅) | |
10 | 9 | fveq2d 6107 | . . . 4 ⊢ (¬ 𝑅 ∈ V → (0g‘(mulGrp‘𝑅)) = (0g‘∅)) |
11 | 7, 8, 10 | 3eqtr4a 2670 | . . 3 ⊢ (¬ 𝑅 ∈ V → (1r‘𝑅) = (0g‘(mulGrp‘𝑅))) |
12 | 6, 11 | pm2.61i 175 | . 2 ⊢ (1r‘𝑅) = (0g‘(mulGrp‘𝑅)) |
13 | ringidval.u | . 2 ⊢ 1 = (1r‘𝑅) | |
14 | ringidval.g | . . 3 ⊢ 𝐺 = (mulGrp‘𝑅) | |
15 | 14 | fveq2i 6106 | . 2 ⊢ (0g‘𝐺) = (0g‘(mulGrp‘𝑅)) |
16 | 12, 13, 15 | 3eqtr4i 2642 | 1 ⊢ 1 = (0g‘𝐺) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 = wceq 1475 ∈ wcel 1977 Vcvv 3173 ∅c0 3874 ∘ ccom 5042 Fn wfn 5799 ‘cfv 5804 0gc0g 15923 mulGrpcmgp 18312 1rcur 18324 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-sbc 3403 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-iota 5768 df-fun 5806 df-fn 5807 df-fv 5812 df-ov 6552 df-slot 15699 df-base 15700 df-0g 15925 df-mgp 18313 df-ur 18325 |
This theorem is referenced by: dfur2 18327 srgidcl 18341 srgidmlem 18343 issrgid 18346 srgpcomp 18355 srg1expzeq1 18362 srgbinom 18368 ringidcl 18391 ringidmlem 18393 isringid 18396 prds1 18437 oppr1 18457 unitsubm 18493 rngidpropd 18518 dfrhm2 18540 isrhm2d 18551 rhm1 18553 subrgsubm 18616 issubrg3 18631 assamulgscmlem1 19169 mplcoe3 19287 mplcoe5 19289 mplbas2 19291 evlslem1 19336 ply1scltm 19472 lply1binomsc 19498 evls1gsummul 19511 evl1gsummul 19545 cnfldexp 19598 expmhm 19634 nn0srg 19635 rge0srg 19636 madetsumid 20086 mat1mhm 20109 scmatmhm 20159 mdet0pr 20217 mdetunilem7 20243 smadiadetlem4 20294 mat2pmatmhm 20357 pm2mpmhm 20444 chfacfscmulgsum 20484 chfacfpmmulgsum 20488 cpmadugsumlemF 20500 efsubm 24101 amgmlem 24516 amgm 24517 wilthlem2 24595 wilthlem3 24596 dchrelbas3 24763 dchrzrh1 24769 dchrmulcl 24774 dchrn0 24775 dchrinvcl 24778 dchrfi 24780 dchrabs 24785 sumdchr2 24795 rpvmasum2 25001 psgnid 29178 iistmd 29276 isdomn3 36801 mon1psubm 36803 deg1mhm 36804 c0rhm 41702 c0rnghm 41703 amgmwlem 42357 amgmlemALT 42358 |
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