Theorem grpss 18930

Description: Show that a structure extending a constructed group (e.g., a ring) is also a group. This allows to prove that a constructed potential ring 𝑅 is a group before we know that it is also a ring. (Theorem ringgrp 20219, on the other hand, requires that we know in advance that 𝑅 is a ring.) (Contributed by NM, 11-Oct-2013.)

Hypotheses

Ref	Expression
grpss.g	⊢ 𝐺 = {⟨(Base‘ndx), 𝐵⟩, ⟨(+g‘ndx), + ⟩}
grpss.r	⊢ 𝑅 ∈ V
grpss.s	⊢ 𝐺 ⊆ 𝑅
grpss.f	⊢ Fun 𝑅

Assertion

Ref	Expression
grpss	⊢ (𝐺 ∈ Grp ↔ 𝑅 ∈ Grp)

Proof of Theorem grpss

Step	Hyp	Ref	Expression
1		grpss.r	. . . 4 ⊢ 𝑅 ∈ V
2		grpss.f	. . . 4 ⊢ Fun 𝑅
3		grpss.s	. . . 4 ⊢ 𝐺 ⊆ 𝑅
4		baseid 17182	. . . 4 ⊢ Base = Slot (Base‘ndx)
5		opex 5416	. . . . . 6 ⊢ ⟨(Base‘ndx), 𝐵⟩ ∈ V
6	5	prid1 4706	. . . . 5 ⊢ ⟨(Base‘ndx), 𝐵⟩ ∈ {⟨(Base‘ndx), 𝐵⟩, ⟨(+g‘ndx), + ⟩}
7		grpss.g	. . . . 5 ⊢ 𝐺 = {⟨(Base‘ndx), 𝐵⟩, ⟨(+g‘ndx), + ⟩}
8	6, 7	eleqtrri 2835	. . . 4 ⊢ ⟨(Base‘ndx), 𝐵⟩ ∈ 𝐺
9	1, 2, 3, 4, 8	strss 17176	. . 3 ⊢ (Base‘𝑅) = (Base‘𝐺)
10		plusgid 17247	. . . 4 ⊢ +g = Slot (+g‘ndx)
11		opex 5416	. . . . . 6 ⊢ ⟨(+g‘ndx), + ⟩ ∈ V
12	11	prid2 4707	. . . . 5 ⊢ ⟨(+g‘ndx), + ⟩ ∈ {⟨(Base‘ndx), 𝐵⟩, ⟨(+g‘ndx), + ⟩}
13	12, 7	eleqtrri 2835	. . . 4 ⊢ ⟨(+g‘ndx), + ⟩ ∈ 𝐺
14	1, 2, 3, 10, 13	strss 17176	. . 3 ⊢ (+g‘𝑅) = (+g‘𝐺)
15	9, 14	grpprop 18928	. 2 ⊢ (𝑅 ∈ Grp ↔ 𝐺 ∈ Grp)
16	15	bicomi 224	1 ⊢ (𝐺 ∈ Grp ↔ 𝑅 ∈ Grp)

Syntax hints:   ↔ wb 206   = wceq 1542   ∈ wcel 2114  Vcvv 3429   ⊆ wss 3889  {cpr 4569  ⟨cop 4573  Fun wfun 6492  ‘cfv 6498  ndxcnx 17163  Basecbs 17179  +_gcplusg 17220  Grpcgrp 18909

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-sep 5231  ax-nul 5241  ax-pow 5307  ax-pr 5375  ax-un 7689  ax-cnex 11094  ax-1cn 11096  ax-addcl 11098

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-reu 3343  df-rab 3390  df-v 3431  df-sbc 3729  df-csb 3838  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-pss 3909  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-iun 4935  df-br 5086  df-opab 5148  df-mpt 5167  df-tr 5193  df-id 5526  df-eprel 5531  df-po 5539  df-so 5540  df-fr 5584  df-we 5586  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-pred 6265  df-ord 6326  df-on 6327  df-lim 6328  df-suc 6329  df-iota 6454  df-fun 6500  df-fn 6501  df-f 6502  df-f1 6503  df-fo 6504  df-f1o 6505  df-fv 6506  df-ov 7370  df-om 7818  df-2nd 7943  df-frecs 8231  df-wrecs 8262  df-recs 8311  df-rdg 8349  df-nn 12175  df-2 12244  df-slot 17152  df-ndx 17164  df-base 17180  df-plusg 17233  df-0g 17404  df-mgm 18608  df-sgrp 18687  df-mnd 18703  df-grp 18912

This theorem is referenced by: (None)