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| Mirrors > Home > ILE Home > Th. List > ringen1zr0 | GIF version | ||
| Description: The only unital ring with one element is the zero ring (at least if its operations are internal binary operations). This holds already for nonunital rings, see rngen1zr0 14312, and semirings, see srgen1zr0 14343. (Contributed by FL, 15-Feb-2010.) (Revised by AV, 25-Jan-2020.) (Proof shortened by AV, 19-Jun-2026.) |
| Ref | Expression |
|---|---|
| ring1zr.b | ⊢ 𝐵 = (Base‘𝑅) |
| ring1zr.p | ⊢ + = (+g‘𝑅) |
| ring1zr.t | ⊢ ∗ = (.r‘𝑅) |
| ringen1zr0.0 | ⊢ 𝑍 = (0g‘𝑅) |
| Ref | Expression |
|---|---|
| ringen1zr0 | ⊢ ((𝑅 ∈ Ring ∧ + Fn (𝐵 × 𝐵) ∧ ∗ Fn (𝐵 × 𝐵)) → (𝐵 ≈ 1o ↔ ( + = {〈〈𝑍, 𝑍〉, 𝑍〉} ∧ ∗ = {〈〈𝑍, 𝑍〉, 𝑍〉}))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ringrng 14392 | . 2 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Rng) | |
| 2 | ring1zr.b | . . 3 ⊢ 𝐵 = (Base‘𝑅) | |
| 3 | ring1zr.p | . . 3 ⊢ + = (+g‘𝑅) | |
| 4 | ring1zr.t | . . 3 ⊢ ∗ = (.r‘𝑅) | |
| 5 | ringen1zr0.0 | . . 3 ⊢ 𝑍 = (0g‘𝑅) | |
| 6 | 2, 3, 4, 5 | rngen1zr0 14312 | . 2 ⊢ ((𝑅 ∈ Rng ∧ + Fn (𝐵 × 𝐵) ∧ ∗ Fn (𝐵 × 𝐵)) → (𝐵 ≈ 1o ↔ ( + = {〈〈𝑍, 𝑍〉, 𝑍〉} ∧ ∗ = {〈〈𝑍, 𝑍〉, 𝑍〉}))) |
| 7 | 1, 6 | syl3an1 1311 | 1 ⊢ ((𝑅 ∈ Ring ∧ + Fn (𝐵 × 𝐵) ∧ ∗ Fn (𝐵 × 𝐵)) → (𝐵 ≈ 1o ↔ ( + = {〈〈𝑍, 𝑍〉, 𝑍〉} ∧ ∗ = {〈〈𝑍, 𝑍〉, 𝑍〉}))) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ↔ wb 105 ∧ w3a 1009 = wceq 1402 ∈ wcel 2209 {csn 3709 〈cop 3712 class class class wbr 4130 × cxp 4772 Fn wfn 5372 ‘cfv 5377 1oc1o 6680 ≈ cen 7020 Basecbs 13403 +gcplusg 13482 .rcmulr 13483 0gc0g 13661 Rngcrng 14282 Ringcrg 14351 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4246 ax-sep 4249 ax-nul 4259 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-iinf 4735 ax-cnex 8271 ax-resscn 8272 ax-1cn 8273 ax-1re 8274 ax-icn 8275 ax-addcl 8276 ax-addrcl 8277 ax-mulcl 8278 ax-addcom 8280 ax-addass 8282 ax-i2m1 8285 ax-0lt1 8286 ax-0id 8288 ax-rnegex 8289 ax-pre-ltirr 8292 ax-pre-ltadd 8296 |
| This proof depends on definitions: df-bi 117 df-dc 847 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rmo 2536 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-if 3639 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-iun 4014 df-br 4131 df-opab 4193 df-mpt 4194 df-tr 4230 df-id 4438 df-iord 4511 df-on 4513 df-suc 4516 df-iom 4738 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-res 4786 df-ima 4787 df-iota 5337 df-fun 5379 df-fn 5380 df-f 5381 df-f1 5382 df-fo 5383 df-f1o 5384 df-fv 5385 df-riota 6038 df-ov 6088 df-oprab 6089 df-mpo 6090 df-1st 6374 df-2nd 6375 df-1o 6687 df-er 6807 df-en 7023 df-fin 7025 df-pnf 8363 df-mnf 8364 df-ltxr 8366 df-inn 9308 df-2 9366 df-3 9367 df-ndx 13406 df-slot 13407 df-base 13409 df-sets 13410 df-plusg 13495 df-mulr 13496 df-0g 13663 df-plusf 13726 df-mgm 13727 df-sgrp 13768 df-mnd 13781 df-grp 13859 df-minusg 13860 df-cmn 14140 df-abl 14141 df-mgp 14269 df-rng 14283 df-ur 14314 df-ring 14353 |
| This theorem is used by: (None) |
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