Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > zrhchr | Structured version Visualization version GIF version |
Description: The kernel of the homomorphism from the integers to a ring is injective if and only if the ring has characteristic 0 . (Contributed by Thierry Arnoux, 8-Nov-2017.) |
Ref | Expression |
---|---|
zrhker.0 | ⊢ 𝐵 = (Base‘𝑅) |
zrhker.1 | ⊢ 𝐿 = (ℤRHom‘𝑅) |
zrhker.2 | ⊢ 0 = (0g‘𝑅) |
Ref | Expression |
---|---|
zrhchr | ⊢ (𝑅 ∈ Ring → ((chr‘𝑅) = 0 ↔ 𝐿:ℤ–1-1→𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | zrhker.1 | . . . 4 ⊢ 𝐿 = (ℤRHom‘𝑅) | |
2 | eqid 2821 | . . . 4 ⊢ (.g‘𝑅) = (.g‘𝑅) | |
3 | eqid 2821 | . . . 4 ⊢ (1r‘𝑅) = (1r‘𝑅) | |
4 | 1, 2, 3 | zrhval2 20650 | . . 3 ⊢ (𝑅 ∈ Ring → 𝐿 = (𝑥 ∈ ℤ ↦ (𝑥(.g‘𝑅)(1r‘𝑅)))) |
5 | f1eq1 6564 | . . 3 ⊢ (𝐿 = (𝑥 ∈ ℤ ↦ (𝑥(.g‘𝑅)(1r‘𝑅))) → (𝐿:ℤ–1-1→𝐵 ↔ (𝑥 ∈ ℤ ↦ (𝑥(.g‘𝑅)(1r‘𝑅))):ℤ–1-1→𝐵)) | |
6 | 4, 5 | syl 17 | . 2 ⊢ (𝑅 ∈ Ring → (𝐿:ℤ–1-1→𝐵 ↔ (𝑥 ∈ ℤ ↦ (𝑥(.g‘𝑅)(1r‘𝑅))):ℤ–1-1→𝐵)) |
7 | ringgrp 19296 | . . 3 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Grp) | |
8 | zrhker.0 | . . . 4 ⊢ 𝐵 = (Base‘𝑅) | |
9 | 8, 3 | ringidcl 19312 | . . 3 ⊢ (𝑅 ∈ Ring → (1r‘𝑅) ∈ 𝐵) |
10 | eqid 2821 | . . . 4 ⊢ (od‘𝑅) = (od‘𝑅) | |
11 | eqid 2821 | . . . 4 ⊢ (𝑥 ∈ ℤ ↦ (𝑥(.g‘𝑅)(1r‘𝑅))) = (𝑥 ∈ ℤ ↦ (𝑥(.g‘𝑅)(1r‘𝑅))) | |
12 | 8, 10, 2, 11 | odf1 18683 | . . 3 ⊢ ((𝑅 ∈ Grp ∧ (1r‘𝑅) ∈ 𝐵) → (((od‘𝑅)‘(1r‘𝑅)) = 0 ↔ (𝑥 ∈ ℤ ↦ (𝑥(.g‘𝑅)(1r‘𝑅))):ℤ–1-1→𝐵)) |
13 | 7, 9, 12 | syl2anc 586 | . 2 ⊢ (𝑅 ∈ Ring → (((od‘𝑅)‘(1r‘𝑅)) = 0 ↔ (𝑥 ∈ ℤ ↦ (𝑥(.g‘𝑅)(1r‘𝑅))):ℤ–1-1→𝐵)) |
14 | eqid 2821 | . . . . 5 ⊢ (chr‘𝑅) = (chr‘𝑅) | |
15 | 10, 3, 14 | chrval 20666 | . . . 4 ⊢ ((od‘𝑅)‘(1r‘𝑅)) = (chr‘𝑅) |
16 | 15 | eqeq1i 2826 | . . 3 ⊢ (((od‘𝑅)‘(1r‘𝑅)) = 0 ↔ (chr‘𝑅) = 0) |
17 | 16 | a1i 11 | . 2 ⊢ (𝑅 ∈ Ring → (((od‘𝑅)‘(1r‘𝑅)) = 0 ↔ (chr‘𝑅) = 0)) |
18 | 6, 13, 17 | 3bitr2rd 310 | 1 ⊢ (𝑅 ∈ Ring → ((chr‘𝑅) = 0 ↔ 𝐿:ℤ–1-1→𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 = wceq 1533 ∈ wcel 2110 ↦ cmpt 5138 –1-1→wf1 6346 ‘cfv 6349 (class class class)co 7150 0cc0 10531 ℤcz 11975 Basecbs 16477 0gc0g 16707 Grpcgrp 18097 .gcmg 18218 odcod 18646 1rcur 19245 Ringcrg 19291 ℤRHomczrh 20641 chrcchr 20643 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-rep 5182 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-cnex 10587 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 ax-pre-sup 10609 ax-addf 10610 ax-mulf 10611 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-int 4869 df-iun 4913 df-br 5059 df-opab 5121 df-mpt 5139 df-tr 5165 df-id 5454 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-we 5510 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-pred 6142 df-ord 6188 df-on 6189 df-lim 6190 df-suc 6191 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-om 7575 df-1st 7683 df-2nd 7684 df-wrecs 7941 df-recs 8002 df-rdg 8040 df-1o 8096 df-oadd 8100 df-er 8283 df-map 8402 df-en 8504 df-dom 8505 df-sdom 8506 df-fin 8507 df-sup 8900 df-inf 8901 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-div 11292 df-nn 11633 df-2 11694 df-3 11695 df-4 11696 df-5 11697 df-6 11698 df-7 11699 df-8 11700 df-9 11701 df-n0 11892 df-z 11976 df-dec 12093 df-uz 12238 df-rp 12384 df-fz 12887 df-fl 13156 df-mod 13232 df-seq 13364 df-exp 13424 df-cj 14452 df-re 14453 df-im 14454 df-sqrt 14588 df-abs 14589 df-dvds 15602 df-struct 16479 df-ndx 16480 df-slot 16481 df-base 16483 df-sets 16484 df-ress 16485 df-plusg 16572 df-mulr 16573 df-starv 16574 df-tset 16578 df-ple 16579 df-ds 16581 df-unif 16582 df-0g 16709 df-mgm 17846 df-sgrp 17895 df-mnd 17906 df-mhm 17950 df-grp 18100 df-minusg 18101 df-sbg 18102 df-mulg 18219 df-subg 18270 df-ghm 18350 df-od 18650 df-cmn 18902 df-mgp 19234 df-ur 19246 df-ring 19293 df-cring 19294 df-rnghom 19461 df-subrg 19527 df-cnfld 20540 df-zring 20612 df-zrh 20645 df-chr 20647 |
This theorem is referenced by: zrhker 31213 qqhre 31256 |
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