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 2820 | . . . 4 ⊢ (.g‘𝑅) = (.g‘𝑅) | |
3 | eqid 2820 | . . . 4 ⊢ (1r‘𝑅) = (1r‘𝑅) | |
4 | 1, 2, 3 | zrhval2 20634 | . . 3 ⊢ (𝑅 ∈ Ring → 𝐿 = (𝑥 ∈ ℤ ↦ (𝑥(.g‘𝑅)(1r‘𝑅)))) |
5 | f1eq1 6551 | . . 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 19280 | . . 3 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Grp) | |
8 | zrhker.0 | . . . 4 ⊢ 𝐵 = (Base‘𝑅) | |
9 | 8, 3 | ringidcl 19296 | . . 3 ⊢ (𝑅 ∈ Ring → (1r‘𝑅) ∈ 𝐵) |
10 | eqid 2820 | . . . 4 ⊢ (od‘𝑅) = (od‘𝑅) | |
11 | eqid 2820 | . . . 4 ⊢ (𝑥 ∈ ℤ ↦ (𝑥(.g‘𝑅)(1r‘𝑅))) = (𝑥 ∈ ℤ ↦ (𝑥(.g‘𝑅)(1r‘𝑅))) | |
12 | 8, 10, 2, 11 | odf1 18667 | . . 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 2820 | . . . . 5 ⊢ (chr‘𝑅) = (chr‘𝑅) | |
15 | 10, 3, 14 | chrval 20650 | . . . 4 ⊢ ((od‘𝑅)‘(1r‘𝑅)) = (chr‘𝑅) |
16 | 15 | eqeq1i 2825 | . . 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 1537 ∈ wcel 2114 ↦ cmpt 5127 –1-1→wf1 6333 ‘cfv 6336 (class class class)co 7137 0cc0 10518 ℤcz 11963 Basecbs 16461 0gc0g 16691 Grpcgrp 18081 .gcmg 18202 odcod 18630 1rcur 19229 Ringcrg 19275 ℤRHomczrh 20625 chrcchr 20627 |
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 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2792 ax-rep 5171 ax-sep 5184 ax-nul 5191 ax-pow 5247 ax-pr 5311 ax-un 7442 ax-cnex 10574 ax-resscn 10575 ax-1cn 10576 ax-icn 10577 ax-addcl 10578 ax-addrcl 10579 ax-mulcl 10580 ax-mulrcl 10581 ax-mulcom 10582 ax-addass 10583 ax-mulass 10584 ax-distr 10585 ax-i2m1 10586 ax-1ne0 10587 ax-1rid 10588 ax-rnegex 10589 ax-rrecex 10590 ax-cnre 10591 ax-pre-lttri 10592 ax-pre-lttrn 10593 ax-pre-ltadd 10594 ax-pre-mulgt0 10595 ax-pre-sup 10596 ax-addf 10597 ax-mulf 10598 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2653 df-clab 2799 df-cleq 2813 df-clel 2891 df-nfc 2959 df-ne 3012 df-nel 3119 df-ral 3138 df-rex 3139 df-reu 3140 df-rmo 3141 df-rab 3142 df-v 3483 df-sbc 3759 df-csb 3867 df-dif 3922 df-un 3924 df-in 3926 df-ss 3935 df-pss 3937 df-nul 4275 df-if 4449 df-pw 4522 df-sn 4549 df-pr 4551 df-tp 4553 df-op 4555 df-uni 4820 df-int 4858 df-iun 4902 df-br 5048 df-opab 5110 df-mpt 5128 df-tr 5154 df-id 5441 df-eprel 5446 df-po 5455 df-so 5456 df-fr 5495 df-we 5497 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-res 5548 df-ima 5549 df-pred 6129 df-ord 6175 df-on 6176 df-lim 6177 df-suc 6178 df-iota 6295 df-fun 6338 df-fn 6339 df-f 6340 df-f1 6341 df-fo 6342 df-f1o 6343 df-fv 6344 df-riota 7095 df-ov 7140 df-oprab 7141 df-mpo 7142 df-om 7562 df-1st 7670 df-2nd 7671 df-wrecs 7928 df-recs 7989 df-rdg 8027 df-1o 8083 df-oadd 8087 df-er 8270 df-map 8389 df-en 8491 df-dom 8492 df-sdom 8493 df-fin 8494 df-sup 8887 df-inf 8888 df-pnf 10658 df-mnf 10659 df-xr 10660 df-ltxr 10661 df-le 10662 df-sub 10853 df-neg 10854 df-div 11279 df-nn 11620 df-2 11682 df-3 11683 df-4 11684 df-5 11685 df-6 11686 df-7 11687 df-8 11688 df-9 11689 df-n0 11880 df-z 11964 df-dec 12081 df-uz 12226 df-rp 12372 df-fz 12878 df-fl 13147 df-mod 13223 df-seq 13355 df-exp 13415 df-cj 14438 df-re 14439 df-im 14440 df-sqrt 14574 df-abs 14575 df-dvds 15588 df-struct 16463 df-ndx 16464 df-slot 16465 df-base 16467 df-sets 16468 df-ress 16469 df-plusg 16556 df-mulr 16557 df-starv 16558 df-tset 16562 df-ple 16563 df-ds 16565 df-unif 16566 df-0g 16693 df-mgm 17830 df-sgrp 17879 df-mnd 17890 df-mhm 17934 df-grp 18084 df-minusg 18085 df-sbg 18086 df-mulg 18203 df-subg 18254 df-ghm 18334 df-od 18634 df-cmn 18886 df-mgp 19218 df-ur 19230 df-ring 19277 df-cring 19278 df-rnghom 19445 df-subrg 19511 df-cnfld 20524 df-zring 20596 df-zrh 20629 df-chr 20631 |
This theorem is referenced by: zrhker 31220 qqhre 31263 |
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