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| Mirrors > Home > MPE Home > Th. List > subgcl | Structured version Visualization version GIF version | ||
| Description: A subgroup is closed under group operation. (Contributed by Mario Carneiro, 2-Dec-2014.) |
| Ref | Expression |
|---|---|
| subgcl.p | ⊢ + = (+g‘𝐺) |
| Ref | Expression |
|---|---|
| subgcl | ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → (𝑋 + 𝑌) ∈ 𝑆) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2760 | . . . . 5 ⊢ (𝐺 ↾s 𝑆) = (𝐺 ↾s 𝑆) | |
| 2 | 1 | subggrp 19345 | . . . 4 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → (𝐺 ↾s 𝑆) ∈ Grp) |
| 3 | 2 | 3ad2ant1 1151 | . . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → (𝐺 ↾s 𝑆) ∈ Grp) |
| 4 | simp2 1155 | . . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑋 ∈ 𝑆) | |
| 5 | 1 | subgbas 19346 | . . . . 5 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → 𝑆 = (Base‘(𝐺 ↾s 𝑆))) |
| 6 | 5 | 3ad2ant1 1151 | . . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑆 = (Base‘(𝐺 ↾s 𝑆))) |
| 7 | 4, 6 | eleqtrd 2862 | . . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑋 ∈ (Base‘(𝐺 ↾s 𝑆))) |
| 8 | simp3 1156 | . . . 4 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑌 ∈ 𝑆) | |
| 9 | 8, 6 | eleqtrd 2862 | . . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → 𝑌 ∈ (Base‘(𝐺 ↾s 𝑆))) |
| 10 | eqid 2760 | . . . 4 ⊢ (Base‘(𝐺 ↾s 𝑆)) = (Base‘(𝐺 ↾s 𝑆)) | |
| 11 | eqid 2760 | . . . 4 ⊢ (+g‘(𝐺 ↾s 𝑆)) = (+g‘(𝐺 ↾s 𝑆)) | |
| 12 | 10, 11 | grpcl 19158 | . . 3 ⊢ (((𝐺 ↾s 𝑆) ∈ Grp ∧ 𝑋 ∈ (Base‘(𝐺 ↾s 𝑆)) ∧ 𝑌 ∈ (Base‘(𝐺 ↾s 𝑆))) → (𝑋(+g‘(𝐺 ↾s 𝑆))𝑌) ∈ (Base‘(𝐺 ↾s 𝑆))) |
| 13 | 3, 7, 9, 12 | syl3anc 1398 | . 2 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → (𝑋(+g‘(𝐺 ↾s 𝑆))𝑌) ∈ (Base‘(𝐺 ↾s 𝑆))) |
| 14 | subgcl.p | . . . . 5 ⊢ + = (+g‘𝐺) | |
| 15 | 1, 14 | ressplusg 17468 | . . . 4 ⊢ (𝑆 ∈ (SubGrp‘𝐺) → + = (+g‘(𝐺 ↾s 𝑆))) |
| 16 | 15 | 3ad2ant1 1151 | . . 3 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → + = (+g‘(𝐺 ↾s 𝑆))) |
| 17 | 16 | oveqd 7438 | . 2 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → (𝑋 + 𝑌) = (𝑋(+g‘(𝐺 ↾s 𝑆))𝑌)) |
| 18 | 13, 17, 6 | 3eltr4d 2875 | 1 ⊢ ((𝑆 ∈ (SubGrp‘𝐺) ∧ 𝑋 ∈ 𝑆 ∧ 𝑌 ∈ 𝑆) → (𝑋 + 𝑌) ∈ 𝑆) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ w3a 1103 = wceq 1569 ∈ wcel 2144 ‘cfv 6539 (class class class)co 7421 Basecbs 17393 ↾s cress 17414 +gcplusg 17434 Grpcgrp 19150 SubGrpcsubg 19336 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7752 ax-cnex 11260 ax-resscn 11261 ax-1cn 11262 ax-icn 11263 ax-addcl 11264 ax-addrcl 11265 ax-mulcl 11266 ax-mulrcl 11267 ax-mulcom 11268 ax-addass 11269 ax-mulass 11270 ax-distr 11271 ax-i2m1 11272 ax-1ne0 11273 ax-1rid 11274 ax-rnegex 11275 ax-rrecex 11276 ax-cnre 11277 ax-pre-lttri 11278 ax-pre-lttrn 11279 ax-pre-ltadd 11280 ax-pre-mulgt0 11281 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-riota 7378 df-ov 7424 df-oprab 7425 df-mpo 7426 df-om 7879 df-2nd 8003 df-frecs 8303 df-wrecs 8334 df-recs 8383 df-rdg 8422 df-er 8721 df-en 8978 df-dom 8979 df-sdom 8980 df-pnf 11349 df-mnf 11350 df-xr 11351 df-ltxr 11352 df-le 11353 df-sub 11547 df-neg 11548 df-nn 12340 df-2 12409 df-sets 17348 df-slot 17366 df-ndx 17378 df-base 17394 df-ress 17415 df-plusg 17447 df-mgm 18822 df-sgrp 18914 df-mnd 18930 df-grp 19153 df-subg 19339 |
| This theorem is used by: subgcld 19353 subgsubcl 19354 subgmulgcl 19356 issubg2 19358 subgint 19367 ssnmz 19382 eqger 19396 eqgcpbl 19400 resghm 19452 ghmpreima 19458 subgga 19520 gasubg 19522 sylow2blem2 19841 lsmmod 19895 pj1ghm 19923 dprdfadd 20242 pgpfac1lem3 20299 subrngacl 20814 subrgacl 20841 islss4 21243 dflidl2rng 21503 mpllsslem 22313 subgntr 24432 taylply2 26701 efgh 26875 grplsmid 34002 nsgmgclem 34009 nsgqusf1olem1 34011 nsgqusf1olem3 34013 algextdeglem8 34403 |
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