Theorem grpss 18986

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 20274, 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 17238	. . . 4 ⊢ Base = Slot (Base‘ndx)
5		opex 5428	. . . . . 6 ⊢ ⟨(Base‘ndx), 𝐵⟩ ∈ V
6	5	prid1 4718	. . . . 5 ⊢ ⟨(Base‘ndx), 𝐵⟩ ∈ {⟨(Base‘ndx), 𝐵⟩, ⟨(+g‘ndx), + ⟩}
7		grpss.g	. . . . 5 ⊢ 𝐺 = {⟨(Base‘ndx), 𝐵⟩, ⟨(+g‘ndx), + ⟩}
8	6, 7	eleqtrri 2860	. . . 4 ⊢ ⟨(Base‘ndx), 𝐵⟩ ∈ 𝐺
9	1, 2, 3, 4, 8	strss 17232	. . 3 ⊢ (Base‘𝑅) = (Base‘𝐺)
10		plusgid 17303	. . . 4 ⊢ +g = Slot (+g‘ndx)
11		opex 5428	. . . . . 6 ⊢ ⟨(+g‘ndx), + ⟩ ∈ V
12	11	prid2 4719	. . . . 5 ⊢ ⟨(+g‘ndx), + ⟩ ∈ {⟨(Base‘ndx), 𝐵⟩, ⟨(+g‘ndx), + ⟩}
13	12, 7	eleqtrri 2860	. . . 4 ⊢ ⟨(+g‘ndx), + ⟩ ∈ 𝐺
14	1, 2, 3, 10, 13	strss 17232	. . 3 ⊢ (+g‘𝑅) = (+g‘𝐺)
15	9, 14	grpprop 18984	. 2 ⊢ (𝑅 ∈ Grp ↔ 𝐺 ∈ Grp)
16	15	bicomi 226	1 ⊢ (𝐺 ∈ Grp ↔ 𝑅 ∈ Grp)

Syntax hints:   ↔ wb 208   = wceq 1559   ∈ wcel 2141  Vcvv 3453   ⊆ wss 3902  {cpr 4581  ⟨cop 4585  Fun wfun 6509  ‘cfv 6515  ndxcnx 17219  Basecbs 17235  +_gcplusg 17276  Grpcgrp 18965

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-sep 5243  ax-nul 5253  ax-pow 5319  ax-pr 5387  ax-un 7712  ax-cnex 11122  ax-1cn 11124  ax-addcl 11126

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3or 1098  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-nf 1803  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3076  df-rex 3086  df-reu 3367  df-rab 3414  df-v 3455  df-sbc 3743  df-csb 3851  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-pss 3922  df-nul 4284  df-if 4478  df-pw 4554  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4863  df-iun 4948  df-br 5098  df-opab 5160  df-mpt 5179  df-tr 5205  df-id 5538  df-eprel 5543  df-po 5551  df-so 5552  df-fr 5596  df-we 5598  df-xp 5649  df-rel 5650  df-cnv 5651  df-co 5652  df-dm 5653  df-rn 5654  df-res 5655  df-ima 5656  df-pred 6282  df-ord 6343  df-on 6344  df-lim 6345  df-suc 6346  df-iota 6471  df-fun 6517  df-fn 6518  df-f 6519  df-f1 6520  df-fo 6521  df-f1o 6522  df-fv 6523  df-ov 7393  df-om 7841  df-2nd 7965  df-frecs 8255  df-wrecs 8286  df-recs 8335  df-rdg 8374  df-nn 12204  df-2 12273  df-slot 17208  df-ndx 17220  df-base 17236  df-plusg 17289  df-0g 17460  df-mgm 18664  df-sgrp 18743  df-mnd 18759  df-grp 18968

This theorem is referenced by: (None)