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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 13330 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (SubGrp‘𝐺)) → 𝑥 = 𝐵) | 
| 9 | velsn 3639 | . . . . 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 3189 | . 2 ⊢ (𝜑 → (SubGrp‘𝐺) ⊆ {𝐵}) | 
| 13 | 1 | subgid 13305 | . . . 4 ⊢ (𝐺 ∈ Grp → 𝐵 ∈ (SubGrp‘𝐺)) | 
| 14 | 3, 13 | syl 14 | . . 3 ⊢ (𝜑 → 𝐵 ∈ (SubGrp‘𝐺)) | 
| 15 | 14 | snssd 3767 | . 2 ⊢ (𝜑 → {𝐵} ⊆ (SubGrp‘𝐺)) | 
| 16 | 12, 15 | eqssd 3200 | 1 ⊢ (𝜑 → (SubGrp‘𝐺) = {𝐵}) | 
| Colors of variables: wff set class | 
| Syntax hints: → wi 4 ∧ wa 104 = wceq 1364 ∈ wcel 2167 {csn 3622 ‘cfv 5258 Basecbs 12678 0gc0g 12927 Grpcgrp 13132 SubGrpcsubg 13297 | 
| 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 615 ax-in2 616 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-coll 4148 ax-sep 4151 ax-pow 4207 ax-pr 4242 ax-un 4468 ax-setind 4573 ax-cnex 7970 ax-resscn 7971 ax-1cn 7972 ax-1re 7973 ax-icn 7974 ax-addcl 7975 ax-addrcl 7976 ax-mulcl 7977 ax-addcom 7979 ax-addass 7981 ax-i2m1 7984 ax-0lt1 7985 ax-0id 7987 ax-rnegex 7988 ax-pre-ltirr 7991 ax-pre-ltadd 7995 | 
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-nel 2463 df-ral 2480 df-rex 2481 df-reu 2482 df-rmo 2483 df-rab 2484 df-v 2765 df-sbc 2990 df-csb 3085 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-nul 3451 df-pw 3607 df-sn 3628 df-pr 3629 df-op 3631 df-uni 3840 df-int 3875 df-iun 3918 df-br 4034 df-opab 4095 df-mpt 4096 df-id 4328 df-xp 4669 df-rel 4670 df-cnv 4671 df-co 4672 df-dm 4673 df-rn 4674 df-res 4675 df-ima 4676 df-iota 5219 df-fun 5260 df-fn 5261 df-f 5262 df-f1 5263 df-fo 5264 df-f1o 5265 df-fv 5266 df-riota 5877 df-ov 5925 df-oprab 5926 df-mpo 5927 df-pnf 8063 df-mnf 8064 df-ltxr 8066 df-inn 8991 df-2 9049 df-ndx 12681 df-slot 12682 df-base 12684 df-sets 12685 df-iress 12686 df-plusg 12768 df-0g 12929 df-mgm 12999 df-sgrp 13045 df-mnd 13058 df-grp 13135 df-minusg 13136 df-subg 13300 | 
| This theorem is referenced by: trivnsgd 13347 | 
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