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| Mirrors > Home > ILE Home > Th. List > srgen1zr0 | GIF version | ||
| Description: The only semiring with one element is the zero ring (at least if its operations are internal binary operations). (Contributed by FL, 14-Feb-2010.) (Revised by AV, 25-Jan-2020.) |
| Ref | Expression |
|---|---|
| srg1zr.b | ⊢ 𝐵 = (Base‘𝑅) |
| srg1zr.p | ⊢ + = (+g‘𝑅) |
| srg1zr.t | ⊢ ∗ = (.r‘𝑅) |
| srgen1zr0.p | ⊢ 𝑍 = (0g‘𝑅) |
| Ref | Expression |
|---|---|
| srgen1zr0 | ⊢ ((𝑅 ∈ SRing ∧ + Fn (𝐵 × 𝐵) ∧ ∗ Fn (𝐵 × 𝐵)) → (𝐵 ≈ 1o ↔ ( + = {〈〈𝑍, 𝑍〉, 𝑍〉} ∧ ∗ = {〈〈𝑍, 𝑍〉, 𝑍〉}))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | srg1zr.b | . . . 4 ⊢ 𝐵 = (Base‘𝑅) | |
| 2 | srgen1zr0.p | . . . 4 ⊢ 𝑍 = (0g‘𝑅) | |
| 3 | 1, 2 | srg0cl 14281 | . . 3 ⊢ (𝑅 ∈ SRing → 𝑍 ∈ 𝐵) |
| 4 | 3 | 3ad2ant1 1049 | . 2 ⊢ ((𝑅 ∈ SRing ∧ + Fn (𝐵 × 𝐵) ∧ ∗ Fn (𝐵 × 𝐵)) → 𝑍 ∈ 𝐵) |
| 5 | en1eqsnbi 7266 | . . . 4 ⊢ (𝑍 ∈ 𝐵 → (𝐵 ≈ 1o ↔ 𝐵 = {𝑍})) | |
| 6 | 5 | adantl 277 | . . 3 ⊢ (((𝑅 ∈ SRing ∧ + Fn (𝐵 × 𝐵) ∧ ∗ Fn (𝐵 × 𝐵)) ∧ 𝑍 ∈ 𝐵) → (𝐵 ≈ 1o ↔ 𝐵 = {𝑍})) |
| 7 | srg1zr.p | . . . 4 ⊢ + = (+g‘𝑅) | |
| 8 | srg1zr.t | . . . 4 ⊢ ∗ = (.r‘𝑅) | |
| 9 | 1, 7, 8 | srg1zr 14291 | . . 3 ⊢ (((𝑅 ∈ SRing ∧ + Fn (𝐵 × 𝐵) ∧ ∗ Fn (𝐵 × 𝐵)) ∧ 𝑍 ∈ 𝐵) → (𝐵 = {𝑍} ↔ ( + = {〈〈𝑍, 𝑍〉, 𝑍〉} ∧ ∗ = {〈〈𝑍, 𝑍〉, 𝑍〉}))) |
| 10 | 6, 9 | bitrd 188 | . 2 ⊢ (((𝑅 ∈ SRing ∧ + Fn (𝐵 × 𝐵) ∧ ∗ Fn (𝐵 × 𝐵)) ∧ 𝑍 ∈ 𝐵) → (𝐵 ≈ 1o ↔ ( + = {〈〈𝑍, 𝑍〉, 𝑍〉} ∧ ∗ = {〈〈𝑍, 𝑍〉, 𝑍〉}))) |
| 11 | 4, 10 | mpdan 425 | 1 ⊢ ((𝑅 ∈ SRing ∧ + 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 13352 +gcplusg 13431 .rcmulr 13432 0gc0g 13610 SRingcsrg 14267 |
| 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 8270 ax-resscn 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-addcom 8279 ax-addass 8281 ax-i2m1 8284 ax-0lt1 8285 ax-0id 8287 ax-rnegex 8288 ax-pre-ltirr 8291 ax-pre-ltadd 8295 |
| 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 8362 df-mnf 8363 df-ltxr 8365 df-inn 9305 df-2 9363 df-3 9364 df-ndx 13355 df-slot 13356 df-base 13358 df-sets 13359 df-plusg 13444 df-mulr 13445 df-0g 13612 df-plusf 13675 df-mgm 13676 df-sgrp 13717 df-mnd 13730 df-cmn 14089 df-mgp 14218 df-srg 14268 |
| This theorem is used by: (None) |
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