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| Mirrors > Home > ILE Home > Th. List > trivsubgsnd | GIF version | ||
| Description: The only subgroup of a trivial group is itself. (Contributed by Rohan Ridenour, 3-Aug-2023.) |
| Ref | Expression |
|---|---|
| trivsubgsnd.1 | ⊢ 𝐵 = (Base‘𝐺) |
| trivsubgsnd.2 | ⊢ 0 = (0g‘𝐺) |
| trivsubgsnd.3 | ⊢ (𝜑 → 𝐺 ∈ Grp) |
| trivsubgsnd.4 | ⊢ (𝜑 → 𝐵 = { 0 }) |
| Ref | Expression |
|---|---|
| trivsubgsnd | ⊢ (𝜑 → (SubGrp‘𝐺) = {𝐵}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | trivsubgsnd.1 | . . . . . 6 ⊢ 𝐵 = (Base‘𝐺) | |
| 2 | trivsubgsnd.2 | . . . . . 6 ⊢ 0 = (0g‘𝐺) | |
| 3 | trivsubgsnd.3 | . . . . . . 7 ⊢ (𝜑 → 𝐺 ∈ Grp) | |
| 4 | 3 | adantr 276 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (SubGrp‘𝐺)) → 𝐺 ∈ Grp) |
| 5 | trivsubgsnd.4 | . . . . . . 7 ⊢ (𝜑 → 𝐵 = { 0 }) | |
| 6 | 5 | adantr 276 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (SubGrp‘𝐺)) → 𝐵 = { 0 }) |
| 7 | simpr 110 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (SubGrp‘𝐺)) → 𝑥 ∈ (SubGrp‘𝐺)) | |
| 8 | 1, 2, 4, 6, 7 | trivsubgd 13723 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (SubGrp‘𝐺)) → 𝑥 = 𝐵) |
| 9 | velsn 3683 | . . . . 5 ⊢ (𝑥 ∈ {𝐵} ↔ 𝑥 = 𝐵) | |
| 10 | 8, 9 | sylibr 134 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ (SubGrp‘𝐺)) → 𝑥 ∈ {𝐵}) |
| 11 | 10 | ex 115 | . . 3 ⊢ (𝜑 → (𝑥 ∈ (SubGrp‘𝐺) → 𝑥 ∈ {𝐵})) |
| 12 | 11 | ssrdv 3230 | . 2 ⊢ (𝜑 → (SubGrp‘𝐺) ⊆ {𝐵}) |
| 13 | 1 | subgid 13698 | . . . 4 ⊢ (𝐺 ∈ Grp → 𝐵 ∈ (SubGrp‘𝐺)) |
| 14 | 3, 13 | syl 14 | . . 3 ⊢ (𝜑 → 𝐵 ∈ (SubGrp‘𝐺)) |
| 15 | 14 | snssd 3812 | . 2 ⊢ (𝜑 → {𝐵} ⊆ (SubGrp‘𝐺)) |
| 16 | 12, 15 | eqssd 3241 | 1 ⊢ (𝜑 → (SubGrp‘𝐺) = {𝐵}) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 = wceq 1395 ∈ wcel 2200 {csn 3666 ‘cfv 5314 Basecbs 13018 0gc0g 13275 Grpcgrp 13519 SubGrpcsubg 13690 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4198 ax-sep 4201 ax-pow 4257 ax-pr 4292 ax-un 4521 ax-setind 4626 ax-cnex 8078 ax-resscn 8079 ax-1cn 8080 ax-1re 8081 ax-icn 8082 ax-addcl 8083 ax-addrcl 8084 ax-mulcl 8085 ax-addcom 8087 ax-addass 8089 ax-i2m1 8092 ax-0lt1 8093 ax-0id 8095 ax-rnegex 8096 ax-pre-ltirr 8099 ax-pre-ltadd 8103 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rmo 2516 df-rab 2517 df-v 2801 df-sbc 3029 df-csb 3125 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3888 df-int 3923 df-iun 3966 df-br 4083 df-opab 4145 df-mpt 4146 df-id 4381 df-xp 4722 df-rel 4723 df-cnv 4724 df-co 4725 df-dm 4726 df-rn 4727 df-res 4728 df-ima 4729 df-iota 5274 df-fun 5316 df-fn 5317 df-f 5318 df-f1 5319 df-fo 5320 df-f1o 5321 df-fv 5322 df-riota 5947 df-ov 5997 df-oprab 5998 df-mpo 5999 df-pnf 8171 df-mnf 8172 df-ltxr 8174 df-inn 9099 df-2 9157 df-ndx 13021 df-slot 13022 df-base 13024 df-sets 13025 df-iress 13026 df-plusg 13109 df-0g 13277 df-mgm 13375 df-sgrp 13421 df-mnd 13436 df-grp 13522 df-minusg 13523 df-subg 13693 |
| This theorem is referenced by: trivnsgd 13740 |
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