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Mirrors > Home > MPE Home > Th. List > Mathboxes > unitnz | Structured version Visualization version GIF version |
Description: In a nonzero ring, a unit cannot be zero. (Contributed by Thierry Arnoux, 25-Apr-2025.) |
Ref | Expression |
---|---|
unitnz.1 | ⊢ 𝑈 = (Unit‘𝑅) |
unitnz.2 | ⊢ 0 = (0g‘𝑅) |
unitnz.3 | ⊢ (𝜑 → 𝑅 ∈ NzRing) |
unitnz.4 | ⊢ (𝜑 → 𝑋 ∈ 𝑈) |
Ref | Expression |
---|---|
unitnz | ⊢ (𝜑 → 𝑋 ≠ 0 ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | unitnz.4 | . 2 ⊢ (𝜑 → 𝑋 ∈ 𝑈) | |
2 | unitnz.3 | . . . 4 ⊢ (𝜑 → 𝑅 ∈ NzRing) | |
3 | nzrring 20537 | . . . 4 ⊢ (𝑅 ∈ NzRing → 𝑅 ∈ Ring) | |
4 | 2, 3 | syl 17 | . . 3 ⊢ (𝜑 → 𝑅 ∈ Ring) |
5 | eqid 2734 | . . . . 5 ⊢ (1r‘𝑅) = (1r‘𝑅) | |
6 | unitnz.2 | . . . . 5 ⊢ 0 = (0g‘𝑅) | |
7 | 5, 6 | nzrnz 20536 | . . . 4 ⊢ (𝑅 ∈ NzRing → (1r‘𝑅) ≠ 0 ) |
8 | 2, 7 | syl 17 | . . 3 ⊢ (𝜑 → (1r‘𝑅) ≠ 0 ) |
9 | unitnz.1 | . . . . . 6 ⊢ 𝑈 = (Unit‘𝑅) | |
10 | 9, 6, 5 | 0unit 20417 | . . . . 5 ⊢ (𝑅 ∈ Ring → ( 0 ∈ 𝑈 ↔ (1r‘𝑅) = 0 )) |
11 | 10 | necon3bbid 2980 | . . . 4 ⊢ (𝑅 ∈ Ring → (¬ 0 ∈ 𝑈 ↔ (1r‘𝑅) ≠ 0 )) |
12 | 11 | biimpar 477 | . . 3 ⊢ ((𝑅 ∈ Ring ∧ (1r‘𝑅) ≠ 0 ) → ¬ 0 ∈ 𝑈) |
13 | 4, 8, 12 | syl2anc 583 | . 2 ⊢ (𝜑 → ¬ 0 ∈ 𝑈) |
14 | nelne2 3042 | . 2 ⊢ ((𝑋 ∈ 𝑈 ∧ ¬ 0 ∈ 𝑈) → 𝑋 ≠ 0 ) | |
15 | 1, 13, 14 | syl2anc 583 | 1 ⊢ (𝜑 → 𝑋 ≠ 0 ) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 = wceq 1537 ∈ wcel 2103 ≠ wne 2942 ‘cfv 6572 0gc0g 17494 1rcur 20203 Ringcrg 20255 Unitcui 20376 NzRingcnzr 20533 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2105 ax-9 2113 ax-10 2136 ax-11 2153 ax-12 2173 ax-ext 2705 ax-rep 5306 ax-sep 5320 ax-nul 5327 ax-pow 5386 ax-pr 5450 ax-un 7766 ax-cnex 11236 ax-resscn 11237 ax-1cn 11238 ax-icn 11239 ax-addcl 11240 ax-addrcl 11241 ax-mulcl 11242 ax-mulrcl 11243 ax-mulcom 11244 ax-addass 11245 ax-mulass 11246 ax-distr 11247 ax-i2m1 11248 ax-1ne0 11249 ax-1rid 11250 ax-rnegex 11251 ax-rrecex 11252 ax-cnre 11253 ax-pre-lttri 11254 ax-pre-lttrn 11255 ax-pre-ltadd 11256 ax-pre-mulgt0 11257 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3or 1088 df-3an 1089 df-tru 1540 df-fal 1550 df-ex 1778 df-nf 1782 df-sb 2065 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2726 df-clel 2813 df-nfc 2890 df-ne 2943 df-nel 3049 df-ral 3064 df-rex 3073 df-rmo 3383 df-reu 3384 df-rab 3439 df-v 3484 df-sbc 3799 df-csb 3916 df-dif 3973 df-un 3975 df-in 3977 df-ss 3987 df-pss 3990 df-nul 4348 df-if 4549 df-pw 4624 df-sn 4649 df-pr 4651 df-op 4655 df-uni 4932 df-iun 5021 df-br 5170 df-opab 5232 df-mpt 5253 df-tr 5287 df-id 5597 df-eprel 5603 df-po 5611 df-so 5612 df-fr 5654 df-we 5656 df-xp 5705 df-rel 5706 df-cnv 5707 df-co 5708 df-dm 5709 df-rn 5710 df-res 5711 df-ima 5712 df-pred 6331 df-ord 6397 df-on 6398 df-lim 6399 df-suc 6400 df-iota 6524 df-fun 6574 df-fn 6575 df-f 6576 df-f1 6577 df-fo 6578 df-f1o 6579 df-fv 6580 df-riota 7401 df-ov 7448 df-oprab 7449 df-mpo 7450 df-om 7900 df-2nd 8027 df-tpos 8263 df-frecs 8318 df-wrecs 8349 df-recs 8423 df-rdg 8462 df-er 8759 df-en 9000 df-dom 9001 df-sdom 9002 df-pnf 11322 df-mnf 11323 df-xr 11324 df-ltxr 11325 df-le 11326 df-sub 11518 df-neg 11519 df-nn 12290 df-2 12352 df-3 12353 df-sets 17206 df-slot 17224 df-ndx 17236 df-base 17254 df-ress 17283 df-plusg 17319 df-mulr 17320 df-0g 17496 df-mgm 18673 df-sgrp 18752 df-mnd 18768 df-grp 18971 df-minusg 18972 df-cmn 19819 df-abl 19820 df-mgp 20157 df-rng 20175 df-ur 20204 df-ring 20257 df-oppr 20355 df-dvdsr 20378 df-unit 20379 df-invr 20409 df-nzr 20534 |
This theorem is referenced by: ply1unit 33557 ply1dg1rt 33561 m1pmeq 33565 assafld 33642 |
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