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Theorem issubg 17526
 Description: The subgroup predicate. (Contributed by Mario Carneiro, 2-Dec-2014.)
Hypothesis
Ref Expression
issubg.b 𝐵 = (Base‘𝐺)
Assertion
Ref Expression
issubg (𝑆 ∈ (SubGrp‘𝐺) ↔ (𝐺 ∈ Grp ∧ 𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp))

Proof of Theorem issubg
Dummy variables 𝑤 𝑠 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-subg 17523 . . . 4 SubGrp = (𝑤 ∈ Grp ↦ {𝑠 ∈ 𝒫 (Base‘𝑤) ∣ (𝑤s 𝑠) ∈ Grp})
21dmmptss 5595 . . 3 dom SubGrp ⊆ Grp
3 elfvdm 6182 . . 3 (𝑆 ∈ (SubGrp‘𝐺) → 𝐺 ∈ dom SubGrp)
42, 3sseldi 3585 . 2 (𝑆 ∈ (SubGrp‘𝐺) → 𝐺 ∈ Grp)
5 simp1 1059 . 2 ((𝐺 ∈ Grp ∧ 𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp) → 𝐺 ∈ Grp)
6 fveq2 6153 . . . . . . . . . 10 (𝑤 = 𝐺 → (Base‘𝑤) = (Base‘𝐺))
7 issubg.b . . . . . . . . . 10 𝐵 = (Base‘𝐺)
86, 7syl6eqr 2673 . . . . . . . . 9 (𝑤 = 𝐺 → (Base‘𝑤) = 𝐵)
98pweqd 4140 . . . . . . . 8 (𝑤 = 𝐺 → 𝒫 (Base‘𝑤) = 𝒫 𝐵)
10 oveq1 6617 . . . . . . . . 9 (𝑤 = 𝐺 → (𝑤s 𝑠) = (𝐺s 𝑠))
1110eleq1d 2683 . . . . . . . 8 (𝑤 = 𝐺 → ((𝑤s 𝑠) ∈ Grp ↔ (𝐺s 𝑠) ∈ Grp))
129, 11rabeqbidv 3184 . . . . . . 7 (𝑤 = 𝐺 → {𝑠 ∈ 𝒫 (Base‘𝑤) ∣ (𝑤s 𝑠) ∈ Grp} = {𝑠 ∈ 𝒫 𝐵 ∣ (𝐺s 𝑠) ∈ Grp})
13 fvex 6163 . . . . . . . . . 10 (Base‘𝐺) ∈ V
147, 13eqeltri 2694 . . . . . . . . 9 𝐵 ∈ V
1514pwex 4813 . . . . . . . 8 𝒫 𝐵 ∈ V
1615rabex 4778 . . . . . . 7 {𝑠 ∈ 𝒫 𝐵 ∣ (𝐺s 𝑠) ∈ Grp} ∈ V
1712, 1, 16fvmpt 6244 . . . . . 6 (𝐺 ∈ Grp → (SubGrp‘𝐺) = {𝑠 ∈ 𝒫 𝐵 ∣ (𝐺s 𝑠) ∈ Grp})
1817eleq2d 2684 . . . . 5 (𝐺 ∈ Grp → (𝑆 ∈ (SubGrp‘𝐺) ↔ 𝑆 ∈ {𝑠 ∈ 𝒫 𝐵 ∣ (𝐺s 𝑠) ∈ Grp}))
19 oveq2 6618 . . . . . . . 8 (𝑠 = 𝑆 → (𝐺s 𝑠) = (𝐺s 𝑆))
2019eleq1d 2683 . . . . . . 7 (𝑠 = 𝑆 → ((𝐺s 𝑠) ∈ Grp ↔ (𝐺s 𝑆) ∈ Grp))
2120elrab 3350 . . . . . 6 (𝑆 ∈ {𝑠 ∈ 𝒫 𝐵 ∣ (𝐺s 𝑠) ∈ Grp} ↔ (𝑆 ∈ 𝒫 𝐵 ∧ (𝐺s 𝑆) ∈ Grp))
2214elpw2 4793 . . . . . . 7 (𝑆 ∈ 𝒫 𝐵𝑆𝐵)
2322anbi1i 730 . . . . . 6 ((𝑆 ∈ 𝒫 𝐵 ∧ (𝐺s 𝑆) ∈ Grp) ↔ (𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp))
2421, 23bitri 264 . . . . 5 (𝑆 ∈ {𝑠 ∈ 𝒫 𝐵 ∣ (𝐺s 𝑠) ∈ Grp} ↔ (𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp))
2518, 24syl6bb 276 . . . 4 (𝐺 ∈ Grp → (𝑆 ∈ (SubGrp‘𝐺) ↔ (𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp)))
26 ibar 525 . . . 4 (𝐺 ∈ Grp → ((𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp) ↔ (𝐺 ∈ Grp ∧ (𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp))))
2725, 26bitrd 268 . . 3 (𝐺 ∈ Grp → (𝑆 ∈ (SubGrp‘𝐺) ↔ (𝐺 ∈ Grp ∧ (𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp))))
28 3anass 1040 . . 3 ((𝐺 ∈ Grp ∧ 𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp) ↔ (𝐺 ∈ Grp ∧ (𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp)))
2927, 28syl6bbr 278 . 2 (𝐺 ∈ Grp → (𝑆 ∈ (SubGrp‘𝐺) ↔ (𝐺 ∈ Grp ∧ 𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp)))
304, 5, 29pm5.21nii 368 1 (𝑆 ∈ (SubGrp‘𝐺) ↔ (𝐺 ∈ Grp ∧ 𝑆𝐵 ∧ (𝐺s 𝑆) ∈ Grp))
 Colors of variables: wff setvar class Syntax hints:   ↔ wb 196   ∧ wa 384   ∧ w3a 1036   = wceq 1480   ∈ wcel 1987  {crab 2911  Vcvv 3189   ⊆ wss 3559  𝒫 cpw 4135  dom cdm 5079  ‘cfv 5852  (class class class)co 6610  Basecbs 15792   ↾s cress 15793  Grpcgrp 17354  SubGrpcsubg 17520 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2912  df-rex 2913  df-rab 2916  df-v 3191  df-sbc 3422  df-dif 3562  df-un 3564  df-in 3566  df-ss 3573  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-op 4160  df-uni 4408  df-br 4619  df-opab 4679  df-mpt 4680  df-id 4994  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-iota 5815  df-fun 5854  df-fv 5860  df-ov 6613  df-subg 17523 This theorem is referenced by:  subgss  17527  subgid  17528  subggrp  17529  subgrcl  17531  issubg2  17541  resgrpisgrp  17547  subsubg  17549  pgrpsubgsymgbi  17759  opprsubg  18568  subrgsubg  18718  cphsubrglem  22900  suborng  29624
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