Theorem grpissubg 13974

Description: If the base set of a group is contained in the base set of another group, and the group operation of the group is the restriction of the group operation of the other group to its base set, then the (base set of the) group is subgroup of the other group. (Contributed by AV, 14-Mar-2019.)

Hypotheses

Ref	Expression
grpissubg.b	⊢ 𝐵 = (Base‘𝐺)
grpissubg.s	⊢ 𝑆 = (Base‘𝐻)

Assertion

Ref	Expression
grpissubg	⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) → ((𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆))) → 𝑆 ∈ (SubGrp‘𝐺)))

Proof of Theorem grpissubg

Dummy variables 𝑎 𝑏 𝑥 𝑦 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpl 109	. . . 4 ⊢ ((𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆))) → 𝑆 ⊆ 𝐵)
2	1	adantl 277	. . 3 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → 𝑆 ⊆ 𝐵)
3		grpissubg.s	. . . . . 6 ⊢ 𝑆 = (Base‘𝐻)
4		eqid 2238	. . . . . 6 ⊢ (0g‘𝐻) = (0g‘𝐻)
5	3, 4	grpidcl 13811	. . . . 5 ⊢ (𝐻 ∈ Grp → (0g‘𝐻) ∈ 𝑆)
6		elex2 2838	. . . . 5 ⊢ ((0g‘𝐻) ∈ 𝑆 → ∃𝑤 𝑤 ∈ 𝑆)
7	5, 6	syl 14	. . . 4 ⊢ (𝐻 ∈ Grp → ∃𝑤 𝑤 ∈ 𝑆)
8	7	ad2antlr 493	. . 3 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → ∃𝑤 𝑤 ∈ 𝑆)
9		grpmnd 13789	. . . . . . . . . . 11 ⊢ (𝐺 ∈ Grp → 𝐺 ∈ Mnd)
10		mndmgm 13712	. . . . . . . . . . 11 ⊢ (𝐺 ∈ Mnd → 𝐺 ∈ Mgm)
11	9, 10	syl 14	. . . . . . . . . 10 ⊢ (𝐺 ∈ Grp → 𝐺 ∈ Mgm)
12		grpmnd 13789	. . . . . . . . . . 11 ⊢ (𝐻 ∈ Grp → 𝐻 ∈ Mnd)
13		mndmgm 13712	. . . . . . . . . . 11 ⊢ (𝐻 ∈ Mnd → 𝐻 ∈ Mgm)
14	12, 13	syl 14	. . . . . . . . . 10 ⊢ (𝐻 ∈ Grp → 𝐻 ∈ Mgm)
15	11, 14	anim12i 338	. . . . . . . . 9 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) → (𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm))
16	15	adantr 276	. . . . . . . 8 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → (𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm))
17	16	ad2antrr 492	. . . . . . 7 ⊢ (((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ 𝑎 ∈ 𝑆) ∧ 𝑏 ∈ 𝑆) → (𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm))
18		simpr 110	. . . . . . . 8 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆))))
19	18	ad2antrr 492	. . . . . . 7 ⊢ (((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ 𝑎 ∈ 𝑆) ∧ 𝑏 ∈ 𝑆) → (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆))))
20		simpr 110	. . . . . . . 8 ⊢ ((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ 𝑎 ∈ 𝑆) → 𝑎 ∈ 𝑆)
21	20	anim1i 340	. . . . . . 7 ⊢ (((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ 𝑎 ∈ 𝑆) ∧ 𝑏 ∈ 𝑆) → (𝑎 ∈ 𝑆 ∧ 𝑏 ∈ 𝑆))
22		grpissubg.b	. . . . . . . 8 ⊢ 𝐵 = (Base‘𝐺)
23	22, 3	mgmsscl 13658	. . . . . . 7 ⊢ (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑎 ∈ 𝑆 ∧ 𝑏 ∈ 𝑆)) → (𝑎(+g‘𝐺)𝑏) ∈ 𝑆)
24	17, 19, 21, 23	syl3anc 1278	. . . . . 6 ⊢ (((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ 𝑎 ∈ 𝑆) ∧ 𝑏 ∈ 𝑆) → (𝑎(+g‘𝐺)𝑏) ∈ 𝑆)
25	24	ralrimiva 2623	. . . . 5 ⊢ ((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ 𝑎 ∈ 𝑆) → ∀𝑏 ∈ 𝑆 (𝑎(+g‘𝐺)𝑏) ∈ 𝑆)
26		simpl 109	. . . . . . . . 9 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) → 𝐺 ∈ Grp)
27	26	adantr 276	. . . . . . . 8 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → 𝐺 ∈ Grp)
28		simplr 533	. . . . . . . 8 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → 𝐻 ∈ Grp)
29	22	sseq2i 3275	. . . . . . . . . . 11 ⊢ (𝑆 ⊆ 𝐵 ↔ 𝑆 ⊆ (Base‘𝐺))
30	29	biimpi 120	. . . . . . . . . 10 ⊢ (𝑆 ⊆ 𝐵 → 𝑆 ⊆ (Base‘𝐺))
31	30	adantr 276	. . . . . . . . 9 ⊢ ((𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆))) → 𝑆 ⊆ (Base‘𝐺))
32	31	adantl 277	. . . . . . . 8 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → 𝑆 ⊆ (Base‘𝐺))
33		ovres 6219	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ 𝑆 ∧ 𝑦 ∈ 𝑆) → (𝑥((+g‘𝐺) ↾ (𝑆 × 𝑆))𝑦) = (𝑥(+g‘𝐺)𝑦))
34	33	adantl 277	. . . . . . . . . 10 ⊢ ((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ (𝑥 ∈ 𝑆 ∧ 𝑦 ∈ 𝑆)) → (𝑥((+g‘𝐺) ↾ (𝑆 × 𝑆))𝑦) = (𝑥(+g‘𝐺)𝑦))
35		oveq 6081	. . . . . . . . . . . . 13 ⊢ ((+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)) → (𝑥(+g‘𝐻)𝑦) = (𝑥((+g‘𝐺) ↾ (𝑆 × 𝑆))𝑦))
36	35	adantl 277	. . . . . . . . . . . 12 ⊢ ((𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆))) → (𝑥(+g‘𝐻)𝑦) = (𝑥((+g‘𝐺) ↾ (𝑆 × 𝑆))𝑦))
37	36	eqcomd 2244	. . . . . . . . . . 11 ⊢ ((𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆))) → (𝑥((+g‘𝐺) ↾ (𝑆 × 𝑆))𝑦) = (𝑥(+g‘𝐻)𝑦))
38	37	ad2antlr 493	. . . . . . . . . 10 ⊢ ((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ (𝑥 ∈ 𝑆 ∧ 𝑦 ∈ 𝑆)) → (𝑥((+g‘𝐺) ↾ (𝑆 × 𝑆))𝑦) = (𝑥(+g‘𝐻)𝑦))
39	34, 38	eqtr3d 2273	. . . . . . . . 9 ⊢ ((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ (𝑥 ∈ 𝑆 ∧ 𝑦 ∈ 𝑆)) → (𝑥(+g‘𝐺)𝑦) = (𝑥(+g‘𝐻)𝑦))
40	39	ralrimivva 2632	. . . . . . . 8 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → ∀𝑥 ∈ 𝑆 ∀𝑦 ∈ 𝑆 (𝑥(+g‘𝐺)𝑦) = (𝑥(+g‘𝐻)𝑦))
41	27, 28, 3, 32, 40	grpinvssd 13859	. . . . . . 7 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → (𝑎 ∈ 𝑆 → ((invg‘𝐻)‘𝑎) = ((invg‘𝐺)‘𝑎)))
42	41	imp 124	. . . . . 6 ⊢ ((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ 𝑎 ∈ 𝑆) → ((invg‘𝐻)‘𝑎) = ((invg‘𝐺)‘𝑎))
43		eqid 2238	. . . . . . . 8 ⊢ (invg‘𝐻) = (invg‘𝐻)
44	3, 43	grpinvcl 13830	. . . . . . 7 ⊢ ((𝐻 ∈ Grp ∧ 𝑎 ∈ 𝑆) → ((invg‘𝐻)‘𝑎) ∈ 𝑆)
45	44	ad4ant24 520	. . . . . 6 ⊢ ((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ 𝑎 ∈ 𝑆) → ((invg‘𝐻)‘𝑎) ∈ 𝑆)
46	42, 45	eqeltrrd 2316	. . . . 5 ⊢ ((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ 𝑎 ∈ 𝑆) → ((invg‘𝐺)‘𝑎) ∈ 𝑆)
47	25, 46	jca 306	. . . 4 ⊢ ((((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) ∧ 𝑎 ∈ 𝑆) → (∀𝑏 ∈ 𝑆 (𝑎(+g‘𝐺)𝑏) ∈ 𝑆 ∧ ((invg‘𝐺)‘𝑎) ∈ 𝑆))
48	47	ralrimiva 2623	. . 3 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → ∀𝑎 ∈ 𝑆 (∀𝑏 ∈ 𝑆 (𝑎(+g‘𝐺)𝑏) ∈ 𝑆 ∧ ((invg‘𝐺)‘𝑎) ∈ 𝑆))
49		eqid 2238	. . . . 5 ⊢ (+g‘𝐺) = (+g‘𝐺)
50		eqid 2238	. . . . 5 ⊢ (invg‘𝐺) = (invg‘𝐺)
51	22, 49, 50	issubg2m 13969	. . . 4 ⊢ (𝐺 ∈ Grp → (𝑆 ∈ (SubGrp‘𝐺) ↔ (𝑆 ⊆ 𝐵 ∧ ∃𝑤 𝑤 ∈ 𝑆 ∧ ∀𝑎 ∈ 𝑆 (∀𝑏 ∈ 𝑆 (𝑎(+g‘𝐺)𝑏) ∈ 𝑆 ∧ ((invg‘𝐺)‘𝑎) ∈ 𝑆))))
52	51	ad2antrr 492	. . 3 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → (𝑆 ∈ (SubGrp‘𝐺) ↔ (𝑆 ⊆ 𝐵 ∧ ∃𝑤 𝑤 ∈ 𝑆 ∧ ∀𝑎 ∈ 𝑆 (∀𝑏 ∈ 𝑆 (𝑎(+g‘𝐺)𝑏) ∈ 𝑆 ∧ ((invg‘𝐺)‘𝑎) ∈ 𝑆))))
53	2, 8, 48, 52	mpbir3and 1211	. 2 ⊢ (((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) ∧ (𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆)))) → 𝑆 ∈ (SubGrp‘𝐺))
54	53	ex 115	1 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ Grp) → ((𝑆 ⊆ 𝐵 ∧ (+g‘𝐻) = ((+g‘𝐺) ↾ (𝑆 × 𝑆))) → 𝑆 ∈ (SubGrp‘𝐺)))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   ∧ w3a 1009   = wceq 1402  ∃wex 1545   ∈ wcel 2209  ∀wral 2528   ⊆ wss 3220   × cxp 4767   ↾ cres 4771  ‘cfv 5372  (class class class)co 6075  Basecbs 13330  +_gcplusg 13408  0_gc0g 13587  Mgmcmgm 13651  Mndcmnd 13706  Grpcgrp 13782  inv_gcminusg 13783  SubGrpcsubg 13947

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4241  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-cnex 8260  ax-resscn 8261  ax-1cn 8262  ax-1re 8263  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-addcom 8269  ax-addass 8271  ax-i2m1 8274  ax-0lt1 8275  ax-0id 8277  ax-rnegex 8278  ax-pre-ltirr 8281  ax-pre-ltadd 8285

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-int 3966  df-iun 4009  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-f1 5377  df-fo 5378  df-f1o 5379  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-pnf 8352  df-mnf 8353  df-ltxr 8355  df-inn 9284  df-2 9342  df-ndx 13333  df-slot 13334  df-base 13336  df-sets 13337  df-iress 13338  df-plusg 13421  df-0g 13589  df-mgm 13653  df-sgrp 13694  df-mnd 13707  df-grp 13785  df-minusg 13786  df-subg 13950

This theorem is referenced by:  resgrpisgrp  13975