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| Mirrors > Home > MPE Home > Th. List > issubgrpd2 | Structured version Visualization version 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 | 2 | ne0d 4291 | . 2 ⊢ (𝜑 → 𝐷 ≠ ∅) |
| 4 | issubgrpd.p | . . . . . . . 8 ⊢ (𝜑 → + = (+g‘𝐼)) | |
| 5 | 4 | oveqd 7468 | . . . . . . 7 ⊢ (𝜑 → (𝑥 + 𝑦) = (𝑥(+g‘𝐼)𝑦)) |
| 6 | 5 | ad2antrr 739 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐷) ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) = (𝑥(+g‘𝐼)𝑦)) |
| 7 | issubgrpd.acl | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷 ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) ∈ 𝐷) | |
| 8 | 7 | 3expa 1136 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐷) ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) ∈ 𝐷) |
| 9 | 6, 8 | eqeltrrd 2865 | . . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐷) ∧ 𝑦 ∈ 𝐷) → (𝑥(+g‘𝐼)𝑦) ∈ 𝐷) |
| 10 | 9 | ralrimiva 3158 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → ∀𝑦 ∈ 𝐷 (𝑥(+g‘𝐼)𝑦) ∈ 𝐷) |
| 11 | issubgrpd.ncl | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → ((invg‘𝐼)‘𝑥) ∈ 𝐷) | |
| 12 | 10, 11 | jca 521 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (∀𝑦 ∈ 𝐷 (𝑥(+g‘𝐼)𝑦) ∈ 𝐷 ∧ ((invg‘𝐼)‘𝑥) ∈ 𝐷)) |
| 13 | 12 | ralrimiva 3158 | . 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐷 (∀𝑦 ∈ 𝐷 (𝑥(+g‘𝐼)𝑦) ∈ 𝐷 ∧ ((invg‘𝐼)‘𝑥) ∈ 𝐷)) |
| 14 | issubgrpd.g | . . 3 ⊢ (𝜑 → 𝐼 ∈ Grp) | |
| 15 | eqid 2763 | . . . 4 ⊢ (Base‘𝐼) = (Base‘𝐼) | |
| 16 | eqid 2763 | . . . 4 ⊢ (+g‘𝐼) = (+g‘𝐼) | |
| 17 | eqid 2763 | . . . 4 ⊢ (invg‘𝐼) = (invg‘𝐼) | |
| 18 | 15, 16, 17 | issubg2 19402 | . . 3 ⊢ (𝐼 ∈ Grp → (𝐷 ∈ (SubGrp‘𝐼) ↔ (𝐷 ⊆ (Base‘𝐼) ∧ 𝐷 ≠ ∅ ∧ ∀𝑥 ∈ 𝐷 (∀𝑦 ∈ 𝐷 (𝑥(+g‘𝐼)𝑦) ∈ 𝐷 ∧ ((invg‘𝐼)‘𝑥) ∈ 𝐷)))) |
| 19 | 14, 18 | syl 18 | . 2 ⊢ (𝜑 → (𝐷 ∈ (SubGrp‘𝐼) ↔ (𝐷 ⊆ (Base‘𝐼) ∧ 𝐷 ≠ ∅ ∧ ∀𝑥 ∈ 𝐷 (∀𝑦 ∈ 𝐷 (𝑥(+g‘𝐼)𝑦) ∈ 𝐷 ∧ ((invg‘𝐼)‘𝑥) ∈ 𝐷)))) |
| 20 | 1, 3, 13, 19 | mpbir3and 1361 | 1 ⊢ (𝜑 → 𝐷 ∈ (SubGrp‘𝐼)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∈ wcel 2147 ≠ wne 2959 ∀wral 3080 ⊆ wss 3900 ∅c0 4281 ‘cfv 6566 (class class class)co 7451 Basecbs 17431 ↾s cress 17452 +gcplusg 17472 0gc0g 17660 Grpcgrp 19194 invgcminusg 19195 SubGrpcsubg 19380 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-cnex 11295 ax-resscn 11296 ax-1cn 11297 ax-icn 11298 ax-addcl 11299 ax-addrcl 11300 ax-mulcl 11301 ax-mulrcl 11302 ax-mulcom 11303 ax-addass 11304 ax-mulass 11305 ax-distr 11306 ax-i2m1 11307 ax-1ne0 11308 ax-1rid 11309 ax-rnegex 11310 ax-rrecex 11311 ax-cnre 11312 ax-pre-lttri 11313 ax-pre-lttrn 11314 ax-pre-ltadd 11315 ax-pre-mulgt0 11316 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-pred 6330 df-ord 6391 df-on 6392 df-lim 6393 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-om 7912 df-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-rdg 8456 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-sub 11582 df-neg 11583 df-nn 12376 df-2 12445 df-sets 17386 df-slot 17404 df-ndx 17416 df-base 17432 df-ress 17453 df-plusg 17486 df-0g 17662 df-mgm 18866 df-sgrp 18958 df-mnd 18974 df-grp 19197 df-minusg 19198 df-subg 19383 |
| This theorem is used by: issubgrpd 19404 symgsssg 19732 symgfisg 19733 issubrgd 21515 dsmmsubg 22104 nsgmgclem 34066 |
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