| Mathbox for Thierry Arnoux |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > subrgchr | Structured version Visualization version GIF version | ||
| Description: If 𝐴 is a subring of 𝑅, then they have the same characteristic. (Contributed by Thierry Arnoux, 24-Feb-2018.) |
| Ref | Expression |
|---|---|
| subrgchr | ⊢ (𝐴 ∈ (SubRing‘𝑅) → (chr‘(𝑅 ↾s 𝐴)) = (chr‘𝑅)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | subrgsubg 20490 | . . . 4 ⊢ (𝐴 ∈ (SubRing‘𝑅) → 𝐴 ∈ (SubGrp‘𝑅)) | |
| 2 | eqid 2731 | . . . . 5 ⊢ (1r‘𝑅) = (1r‘𝑅) | |
| 3 | 2 | subrg1cl 20493 | . . . 4 ⊢ (𝐴 ∈ (SubRing‘𝑅) → (1r‘𝑅) ∈ 𝐴) |
| 4 | eqid 2731 | . . . . 5 ⊢ (𝑅 ↾s 𝐴) = (𝑅 ↾s 𝐴) | |
| 5 | eqid 2731 | . . . . 5 ⊢ (od‘𝑅) = (od‘𝑅) | |
| 6 | eqid 2731 | . . . . 5 ⊢ (od‘(𝑅 ↾s 𝐴)) = (od‘(𝑅 ↾s 𝐴)) | |
| 7 | 4, 5, 6 | subgod 19480 | . . . 4 ⊢ ((𝐴 ∈ (SubGrp‘𝑅) ∧ (1r‘𝑅) ∈ 𝐴) → ((od‘𝑅)‘(1r‘𝑅)) = ((od‘(𝑅 ↾s 𝐴))‘(1r‘𝑅))) |
| 8 | 1, 3, 7 | syl2anc 584 | . . 3 ⊢ (𝐴 ∈ (SubRing‘𝑅) → ((od‘𝑅)‘(1r‘𝑅)) = ((od‘(𝑅 ↾s 𝐴))‘(1r‘𝑅))) |
| 9 | 4, 2 | subrg1 20495 | . . . 4 ⊢ (𝐴 ∈ (SubRing‘𝑅) → (1r‘𝑅) = (1r‘(𝑅 ↾s 𝐴))) |
| 10 | 9 | fveq2d 6826 | . . 3 ⊢ (𝐴 ∈ (SubRing‘𝑅) → ((od‘(𝑅 ↾s 𝐴))‘(1r‘𝑅)) = ((od‘(𝑅 ↾s 𝐴))‘(1r‘(𝑅 ↾s 𝐴)))) |
| 11 | 8, 10 | eqtr2d 2767 | . 2 ⊢ (𝐴 ∈ (SubRing‘𝑅) → ((od‘(𝑅 ↾s 𝐴))‘(1r‘(𝑅 ↾s 𝐴))) = ((od‘𝑅)‘(1r‘𝑅))) |
| 12 | eqid 2731 | . . 3 ⊢ (1r‘(𝑅 ↾s 𝐴)) = (1r‘(𝑅 ↾s 𝐴)) | |
| 13 | eqid 2731 | . . 3 ⊢ (chr‘(𝑅 ↾s 𝐴)) = (chr‘(𝑅 ↾s 𝐴)) | |
| 14 | 6, 12, 13 | chrval 21458 | . 2 ⊢ ((od‘(𝑅 ↾s 𝐴))‘(1r‘(𝑅 ↾s 𝐴))) = (chr‘(𝑅 ↾s 𝐴)) |
| 15 | eqid 2731 | . . 3 ⊢ (chr‘𝑅) = (chr‘𝑅) | |
| 16 | 5, 2, 15 | chrval 21458 | . 2 ⊢ ((od‘𝑅)‘(1r‘𝑅)) = (chr‘𝑅) |
| 17 | 11, 14, 16 | 3eqtr3g 2789 | 1 ⊢ (𝐴 ∈ (SubRing‘𝑅) → (chr‘(𝑅 ↾s 𝐴)) = (chr‘𝑅)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1541 ∈ wcel 2111 ‘cfv 6481 (class class class)co 7346 ↾s cress 17138 SubGrpcsubg 19030 odcod 19434 1rcur 20097 SubRingcsubrg 20482 chrcchr 21436 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5234 ax-nul 5244 ax-pow 5303 ax-pr 5370 ax-un 7668 ax-cnex 11059 ax-resscn 11060 ax-1cn 11061 ax-icn 11062 ax-addcl 11063 ax-addrcl 11064 ax-mulcl 11065 ax-mulrcl 11066 ax-mulcom 11067 ax-addass 11068 ax-mulass 11069 ax-distr 11070 ax-i2m1 11071 ax-1ne0 11072 ax-1rid 11073 ax-rnegex 11074 ax-rrecex 11075 ax-cnre 11076 ax-pre-lttri 11077 ax-pre-lttrn 11078 ax-pre-ltadd 11079 ax-pre-mulgt0 11080 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4476 df-pw 4552 df-sn 4577 df-pr 4579 df-op 4583 df-uni 4860 df-iun 4943 df-br 5092 df-opab 5154 df-mpt 5173 df-tr 5199 df-id 5511 df-eprel 5516 df-po 5524 df-so 5525 df-fr 5569 df-we 5571 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-dm 5626 df-rn 5627 df-res 5628 df-ima 5629 df-pred 6248 df-ord 6309 df-on 6310 df-lim 6311 df-suc 6312 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-om 7797 df-1st 7921 df-2nd 7922 df-frecs 8211 df-wrecs 8242 df-recs 8291 df-rdg 8329 df-er 8622 df-en 8870 df-dom 8871 df-sdom 8872 df-sup 9326 df-inf 9327 df-pnf 11145 df-mnf 11146 df-xr 11147 df-ltxr 11148 df-le 11149 df-sub 11343 df-neg 11344 df-nn 12123 df-2 12185 df-3 12186 df-n0 12379 df-z 12466 df-uz 12730 df-seq 13906 df-sets 17072 df-slot 17090 df-ndx 17102 df-base 17118 df-ress 17139 df-plusg 17171 df-mulr 17172 df-0g 17342 df-mgm 18545 df-sgrp 18624 df-mnd 18640 df-submnd 18689 df-grp 18846 df-minusg 18847 df-mulg 18978 df-subg 19033 df-od 19438 df-mgp 20057 df-ur 20098 df-ring 20151 df-subrg 20483 df-chr 21440 |
| This theorem is referenced by: primefldchr 33262 fldextchr 33677 cnrrext 34018 |
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