Theorem grpss 18597

Description: Show that a structure extending a constructed group (e.g., a ring) is also a group. This allows us to prove that a constructed potential ring 𝑅 is a group before we know that it is also a ring. (Theorem ringgrp 19788, 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 16915	. . . 4 ⊢ Base = Slot (Base‘ndx)
5		opex 5379	. . . . . 6 ⊢ ⟨(Base‘ndx), 𝐵⟩ ∈ V
6	5	prid1 4698	. . . . 5 ⊢ ⟨(Base‘ndx), 𝐵⟩ ∈ {⟨(Base‘ndx), 𝐵⟩, ⟨(+g‘ndx), + ⟩}
7		grpss.g	. . . . 5 ⊢ 𝐺 = {⟨(Base‘ndx), 𝐵⟩, ⟨(+g‘ndx), + ⟩}
8	6, 7	eleqtrri 2838	. . . 4 ⊢ ⟨(Base‘ndx), 𝐵⟩ ∈ 𝐺
9	1, 2, 3, 4, 8	strss 16908	. . 3 ⊢ (Base‘𝑅) = (Base‘𝐺)
10		plusgid 16989	. . . 4 ⊢ +g = Slot (+g‘ndx)
11		opex 5379	. . . . . 6 ⊢ ⟨(+g‘ndx), + ⟩ ∈ V
12	11	prid2 4699	. . . . 5 ⊢ ⟨(+g‘ndx), + ⟩ ∈ {⟨(Base‘ndx), 𝐵⟩, ⟨(+g‘ndx), + ⟩}
13	12, 7	eleqtrri 2838	. . . 4 ⊢ ⟨(+g‘ndx), + ⟩ ∈ 𝐺
14	1, 2, 3, 10, 13	strss 16908	. . 3 ⊢ (+g‘𝑅) = (+g‘𝐺)
15	9, 14	grpprop 18595	. 2 ⊢ (𝑅 ∈ Grp ↔ 𝐺 ∈ Grp)
16	15	bicomi 223	1 ⊢ (𝐺 ∈ Grp ↔ 𝑅 ∈ Grp)

Syntax hints:   ↔ wb 205   = wceq 1539   ∈ wcel 2106  Vcvv 3432   ⊆ wss 3887  {cpr 4563  ⟨cop 4567  Fun wfun 6427  ‘cfv 6433  ndxcnx 16894  Basecbs 16912  +_gcplusg 16962  Grpcgrp 18577

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352  ax-un 7588  ax-cnex 10927  ax-1cn 10929  ax-addcl 10931

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-ral 3069  df-rex 3070  df-reu 3072  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-pss 3906  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-tr 5192  df-id 5489  df-eprel 5495  df-po 5503  df-so 5504  df-fr 5544  df-we 5546  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-pred 6202  df-ord 6269  df-on 6270  df-lim 6271  df-suc 6272  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441  df-ov 7278  df-om 7713  df-2nd 7832  df-frecs 8097  df-wrecs 8128  df-recs 8202  df-rdg 8241  df-nn 11974  df-2 12036  df-slot 16883  df-ndx 16895  df-base 16913  df-plusg 16975  df-0g 17152  df-mgm 18326  df-sgrp 18375  df-mnd 18386  df-grp 18580

This theorem is referenced by: (None)