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| Mirrors > Home > ILE Home > Th. List > issubgrpd2 | GIF version | ||
| Description: Prove a subgroup by closure (definition version). (Contributed by Stefan O'Rear, 7-Dec-2014.) |
| Ref | Expression |
|---|---|
| issubgrpd.s | ⊢ (𝜑 → 𝑆 = (𝐼 ↾s 𝐷)) |
| issubgrpd.z | ⊢ (𝜑 → 0 = (0g‘𝐼)) |
| issubgrpd.p | ⊢ (𝜑 → + = (+g‘𝐼)) |
| issubgrpd.ss | ⊢ (𝜑 → 𝐷 ⊆ (Base‘𝐼)) |
| issubgrpd.zcl | ⊢ (𝜑 → 0 ∈ 𝐷) |
| issubgrpd.acl | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷 ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) ∈ 𝐷) |
| issubgrpd.ncl | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → ((invg‘𝐼)‘𝑥) ∈ 𝐷) |
| issubgrpd.g | ⊢ (𝜑 → 𝐼 ∈ Grp) |
| Ref | Expression |
|---|---|
| issubgrpd2 | ⊢ (𝜑 → 𝐷 ∈ (SubGrp‘𝐼)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | issubgrpd.ss | . 2 ⊢ (𝜑 → 𝐷 ⊆ (Base‘𝐼)) | |
| 2 | issubgrpd.zcl | . . 3 ⊢ (𝜑 → 0 ∈ 𝐷) | |
| 3 | elex2 2816 | . . 3 ⊢ ( 0 ∈ 𝐷 → ∃𝑤 𝑤 ∈ 𝐷) | |
| 4 | 2, 3 | syl 14 | . 2 ⊢ (𝜑 → ∃𝑤 𝑤 ∈ 𝐷) |
| 5 | issubgrpd.p | . . . . . . . 8 ⊢ (𝜑 → + = (+g‘𝐼)) | |
| 6 | 5 | oveqd 6017 | . . . . . . 7 ⊢ (𝜑 → (𝑥 + 𝑦) = (𝑥(+g‘𝐼)𝑦)) |
| 7 | 6 | ad2antrr 488 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐷) ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) = (𝑥(+g‘𝐼)𝑦)) |
| 8 | issubgrpd.acl | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷 ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) ∈ 𝐷) | |
| 9 | 8 | 3expa 1227 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐷) ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) ∈ 𝐷) |
| 10 | 7, 9 | eqeltrrd 2307 | . . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐷) ∧ 𝑦 ∈ 𝐷) → (𝑥(+g‘𝐼)𝑦) ∈ 𝐷) |
| 11 | 10 | ralrimiva 2603 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → ∀𝑦 ∈ 𝐷 (𝑥(+g‘𝐼)𝑦) ∈ 𝐷) |
| 12 | issubgrpd.ncl | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → ((invg‘𝐼)‘𝑥) ∈ 𝐷) | |
| 13 | 11, 12 | jca 306 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (∀𝑦 ∈ 𝐷 (𝑥(+g‘𝐼)𝑦) ∈ 𝐷 ∧ ((invg‘𝐼)‘𝑥) ∈ 𝐷)) |
| 14 | 13 | ralrimiva 2603 | . 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐷 (∀𝑦 ∈ 𝐷 (𝑥(+g‘𝐼)𝑦) ∈ 𝐷 ∧ ((invg‘𝐼)‘𝑥) ∈ 𝐷)) |
| 15 | issubgrpd.g | . . 3 ⊢ (𝜑 → 𝐼 ∈ Grp) | |
| 16 | eqid 2229 | . . . 4 ⊢ (Base‘𝐼) = (Base‘𝐼) | |
| 17 | eqid 2229 | . . . 4 ⊢ (+g‘𝐼) = (+g‘𝐼) | |
| 18 | eqid 2229 | . . . 4 ⊢ (invg‘𝐼) = (invg‘𝐼) | |
| 19 | 16, 17, 18 | issubg2m 13721 | . . 3 ⊢ (𝐼 ∈ Grp → (𝐷 ∈ (SubGrp‘𝐼) ↔ (𝐷 ⊆ (Base‘𝐼) ∧ ∃𝑤 𝑤 ∈ 𝐷 ∧ ∀𝑥 ∈ 𝐷 (∀𝑦 ∈ 𝐷 (𝑥(+g‘𝐼)𝑦) ∈ 𝐷 ∧ ((invg‘𝐼)‘𝑥) ∈ 𝐷)))) |
| 20 | 15, 19 | syl 14 | . 2 ⊢ (𝜑 → (𝐷 ∈ (SubGrp‘𝐼) ↔ (𝐷 ⊆ (Base‘𝐼) ∧ ∃𝑤 𝑤 ∈ 𝐷 ∧ ∀𝑥 ∈ 𝐷 (∀𝑦 ∈ 𝐷 (𝑥(+g‘𝐼)𝑦) ∈ 𝐷 ∧ ((invg‘𝐼)‘𝑥) ∈ 𝐷)))) |
| 21 | 1, 4, 14, 20 | mpbir3and 1204 | 1 ⊢ (𝜑 → 𝐷 ∈ (SubGrp‘𝐼)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∧ w3a 1002 = wceq 1395 ∃wex 1538 ∈ wcel 2200 ∀wral 2508 ⊆ wss 3197 ‘cfv 5317 (class class class)co 6000 Basecbs 13027 ↾s cress 13028 +gcplusg 13105 0gc0g 13284 Grpcgrp 13528 invgcminusg 13529 SubGrpcsubg 13699 |
| 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 4523 ax-setind 4628 ax-cnex 8086 ax-resscn 8087 ax-1cn 8088 ax-1re 8089 ax-icn 8090 ax-addcl 8091 ax-addrcl 8092 ax-mulcl 8093 ax-addcom 8095 ax-addass 8097 ax-i2m1 8100 ax-0lt1 8101 ax-0id 8103 ax-rnegex 8104 ax-pre-ltirr 8107 ax-pre-ltadd 8111 |
| 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 4383 df-xp 4724 df-rel 4725 df-cnv 4726 df-co 4727 df-dm 4728 df-rn 4729 df-res 4730 df-ima 4731 df-iota 5277 df-fun 5319 df-fn 5320 df-f 5321 df-f1 5322 df-fo 5323 df-f1o 5324 df-fv 5325 df-riota 5953 df-ov 6003 df-oprab 6004 df-mpo 6005 df-pnf 8179 df-mnf 8180 df-ltxr 8182 df-inn 9107 df-2 9165 df-ndx 13030 df-slot 13031 df-base 13033 df-sets 13034 df-iress 13035 df-plusg 13118 df-0g 13286 df-mgm 13384 df-sgrp 13430 df-mnd 13445 df-grp 13531 df-minusg 13532 df-subg 13702 |
| This theorem is referenced by: issubgrpd 13723 issubrgd 14410 |
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