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Mirrors > Home > MPE Home > Th. List > isnzr2 | Structured version Visualization version GIF version |
Description: Equivalent characterization of nonzero rings: they have at least two elements. (Contributed by Stefan O'Rear, 24-Feb-2015.) |
Ref | Expression |
---|---|
isnzr2.b | ⊢ 𝐵 = (Base‘𝑅) |
Ref | Expression |
---|---|
isnzr2 | ⊢ (𝑅 ∈ NzRing ↔ (𝑅 ∈ Ring ∧ 2o ≼ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2738 | . . 3 ⊢ (1r‘𝑅) = (1r‘𝑅) | |
2 | eqid 2738 | . . 3 ⊢ (0g‘𝑅) = (0g‘𝑅) | |
3 | 1, 2 | isnzr 20652 | . 2 ⊢ (𝑅 ∈ NzRing ↔ (𝑅 ∈ Ring ∧ (1r‘𝑅) ≠ (0g‘𝑅))) |
4 | isnzr2.b | . . . . . . . . . 10 ⊢ 𝐵 = (Base‘𝑅) | |
5 | 4, 1 | ringidcl 19913 | . . . . . . . . 9 ⊢ (𝑅 ∈ Ring → (1r‘𝑅) ∈ 𝐵) |
6 | 5 | adantr 482 | . . . . . . . 8 ⊢ ((𝑅 ∈ Ring ∧ (1r‘𝑅) ≠ (0g‘𝑅)) → (1r‘𝑅) ∈ 𝐵) |
7 | 4, 2 | ring0cl 19914 | . . . . . . . . 9 ⊢ (𝑅 ∈ Ring → (0g‘𝑅) ∈ 𝐵) |
8 | 7 | adantr 482 | . . . . . . . 8 ⊢ ((𝑅 ∈ Ring ∧ (1r‘𝑅) ≠ (0g‘𝑅)) → (0g‘𝑅) ∈ 𝐵) |
9 | simpr 486 | . . . . . . . 8 ⊢ ((𝑅 ∈ Ring ∧ (1r‘𝑅) ≠ (0g‘𝑅)) → (1r‘𝑅) ≠ (0g‘𝑅)) | |
10 | df-ne 2943 | . . . . . . . . . 10 ⊢ (𝑥 ≠ 𝑦 ↔ ¬ 𝑥 = 𝑦) | |
11 | neeq1 3005 | . . . . . . . . . 10 ⊢ (𝑥 = (1r‘𝑅) → (𝑥 ≠ 𝑦 ↔ (1r‘𝑅) ≠ 𝑦)) | |
12 | 10, 11 | bitr3id 285 | . . . . . . . . 9 ⊢ (𝑥 = (1r‘𝑅) → (¬ 𝑥 = 𝑦 ↔ (1r‘𝑅) ≠ 𝑦)) |
13 | neeq2 3006 | . . . . . . . . 9 ⊢ (𝑦 = (0g‘𝑅) → ((1r‘𝑅) ≠ 𝑦 ↔ (1r‘𝑅) ≠ (0g‘𝑅))) | |
14 | 12, 13 | rspc2ev 3591 | . . . . . . . 8 ⊢ (((1r‘𝑅) ∈ 𝐵 ∧ (0g‘𝑅) ∈ 𝐵 ∧ (1r‘𝑅) ≠ (0g‘𝑅)) → ∃𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 ¬ 𝑥 = 𝑦) |
15 | 6, 8, 9, 14 | syl3anc 1372 | . . . . . . 7 ⊢ ((𝑅 ∈ Ring ∧ (1r‘𝑅) ≠ (0g‘𝑅)) → ∃𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 ¬ 𝑥 = 𝑦) |
16 | 15 | ex 414 | . . . . . 6 ⊢ (𝑅 ∈ Ring → ((1r‘𝑅) ≠ (0g‘𝑅) → ∃𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 ¬ 𝑥 = 𝑦)) |
17 | 4, 1, 2 | ring1eq0 19937 | . . . . . . . . 9 ⊢ ((𝑅 ∈ Ring ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → ((1r‘𝑅) = (0g‘𝑅) → 𝑥 = 𝑦)) |
18 | 17 | 3expb 1121 | . . . . . . . 8 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵)) → ((1r‘𝑅) = (0g‘𝑅) → 𝑥 = 𝑦)) |
19 | 18 | necon3bd 2956 | . . . . . . 7 ⊢ ((𝑅 ∈ Ring ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵)) → (¬ 𝑥 = 𝑦 → (1r‘𝑅) ≠ (0g‘𝑅))) |
20 | 19 | rexlimdvva 3204 | . . . . . 6 ⊢ (𝑅 ∈ Ring → (∃𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 ¬ 𝑥 = 𝑦 → (1r‘𝑅) ≠ (0g‘𝑅))) |
21 | 16, 20 | impbid 211 | . . . . 5 ⊢ (𝑅 ∈ Ring → ((1r‘𝑅) ≠ (0g‘𝑅) ↔ ∃𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 ¬ 𝑥 = 𝑦)) |
22 | 4 | fvexi 6852 | . . . . . 6 ⊢ 𝐵 ∈ V |
23 | 1sdom 9126 | . . . . . 6 ⊢ (𝐵 ∈ V → (1o ≺ 𝐵 ↔ ∃𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 ¬ 𝑥 = 𝑦)) | |
24 | 22, 23 | ax-mp 5 | . . . . 5 ⊢ (1o ≺ 𝐵 ↔ ∃𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 ¬ 𝑥 = 𝑦) |
25 | 21, 24 | bitr4di 289 | . . . 4 ⊢ (𝑅 ∈ Ring → ((1r‘𝑅) ≠ (0g‘𝑅) ↔ 1o ≺ 𝐵)) |
26 | 1onn 8554 | . . . . . 6 ⊢ 1o ∈ ω | |
27 | sucdom 9113 | . . . . . 6 ⊢ (1o ∈ ω → (1o ≺ 𝐵 ↔ suc 1o ≼ 𝐵)) | |
28 | 26, 27 | ax-mp 5 | . . . . 5 ⊢ (1o ≺ 𝐵 ↔ suc 1o ≼ 𝐵) |
29 | df-2o 8381 | . . . . . 6 ⊢ 2o = suc 1o | |
30 | 29 | breq1i 5111 | . . . . 5 ⊢ (2o ≼ 𝐵 ↔ suc 1o ≼ 𝐵) |
31 | 28, 30 | bitr4i 278 | . . . 4 ⊢ (1o ≺ 𝐵 ↔ 2o ≼ 𝐵) |
32 | 25, 31 | bitrdi 287 | . . 3 ⊢ (𝑅 ∈ Ring → ((1r‘𝑅) ≠ (0g‘𝑅) ↔ 2o ≼ 𝐵)) |
33 | 32 | pm5.32i 576 | . 2 ⊢ ((𝑅 ∈ Ring ∧ (1r‘𝑅) ≠ (0g‘𝑅)) ↔ (𝑅 ∈ Ring ∧ 2o ≼ 𝐵)) |
34 | 3, 33 | bitri 275 | 1 ⊢ (𝑅 ∈ NzRing ↔ (𝑅 ∈ Ring ∧ 2o ≼ 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ≠ wne 2942 ∃wrex 3072 Vcvv 3444 class class class wbr 5104 suc csuc 6316 ‘cfv 6492 ωcom 7793 1oc1o 8373 2oc2o 8374 ≼ cdom 8815 ≺ csdm 8816 Basecbs 17018 0gc0g 17256 1rcur 19842 Ringcrg 19888 NzRingcnzr 20650 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2709 ax-sep 5255 ax-nul 5262 ax-pow 5319 ax-pr 5383 ax-un 7663 ax-cnex 11041 ax-resscn 11042 ax-1cn 11043 ax-icn 11044 ax-addcl 11045 ax-addrcl 11046 ax-mulcl 11047 ax-mulrcl 11048 ax-mulcom 11049 ax-addass 11050 ax-mulass 11051 ax-distr 11052 ax-i2m1 11053 ax-1ne0 11054 ax-1rid 11055 ax-rnegex 11056 ax-rrecex 11057 ax-cnre 11058 ax-pre-lttri 11059 ax-pre-lttrn 11060 ax-pre-ltadd 11061 ax-pre-mulgt0 11062 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3064 df-rex 3073 df-rmo 3352 df-reu 3353 df-rab 3407 df-v 3446 df-sbc 3739 df-csb 3855 df-dif 3912 df-un 3914 df-in 3916 df-ss 3926 df-pss 3928 df-nul 4282 df-if 4486 df-pw 4561 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4865 df-iun 4955 df-br 5105 df-opab 5167 df-mpt 5188 df-tr 5222 df-id 5529 df-eprel 5535 df-po 5543 df-so 5544 df-fr 5586 df-we 5588 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6250 df-ord 6317 df-on 6318 df-lim 6319 df-suc 6320 df-iota 6444 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7306 df-ov 7353 df-oprab 7354 df-mpo 7355 df-om 7794 df-2nd 7913 df-frecs 8180 df-wrecs 8211 df-recs 8285 df-rdg 8324 df-1o 8380 df-2o 8381 df-er 8582 df-en 8818 df-dom 8819 df-sdom 8820 df-fin 8821 df-pnf 11125 df-mnf 11126 df-xr 11127 df-ltxr 11128 df-le 11129 df-sub 11321 df-neg 11322 df-nn 12088 df-2 12150 df-sets 16971 df-slot 16989 df-ndx 17001 df-base 17019 df-plusg 17081 df-0g 17258 df-mgm 18432 df-sgrp 18481 df-mnd 18492 df-grp 18686 df-minusg 18687 df-mgp 19826 df-ur 19843 df-ring 19890 df-nzr 20651 |
This theorem is referenced by: opprnzr 20658 znfld 20890 znidomb 20891 |
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