Theorem imasgrp 13820

Description: The image structure of a group is a group. (Contributed by Mario Carneiro, 24-Feb-2015.) (Revised by Mario Carneiro, 5-Sep-2015.)

Hypotheses

Ref	Expression
imasgrp.u	⊢ (𝜑 → 𝑈 = (𝐹 “s 𝑅))
imasgrp.v	⊢ (𝜑 → 𝑉 = (Base‘𝑅))
imasgrp.p	⊢ (𝜑 → + = (+g‘𝑅))
imasgrp.f	⊢ (𝜑 → 𝐹:𝑉–onto→𝐵)
imasgrp.e	⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉) ∧ (𝑝 ∈ 𝑉 ∧ 𝑞 ∈ 𝑉)) → (((𝐹‘𝑎) = (𝐹‘𝑝) ∧ (𝐹‘𝑏) = (𝐹‘𝑞)) → (𝐹‘(𝑎 + 𝑏)) = (𝐹‘(𝑝 + 𝑞))))
imasgrp.r	⊢ (𝜑 → 𝑅 ∈ Grp)
imasgrp.z	⊢ 0 = (0g‘𝑅)

Assertion

Ref	Expression
imasgrp	⊢ (𝜑 → (𝑈 ∈ Grp ∧ (𝐹‘ 0 ) = (0g‘𝑈)))

Distinct variable groups:   𝑞,𝑝,𝐵   𝑎,𝑏,𝑝,𝑞,𝜑   𝑅,𝑝,𝑞   𝐹,𝑎,𝑏,𝑝,𝑞   + ,𝑝,𝑞   𝑈,𝑎,𝑏,𝑝,𝑞   𝑉,𝑎,𝑏,𝑝,𝑞   0 ,𝑝,𝑞

Allowed substitution hints:   𝐵(𝑎,𝑏)   + (𝑎,𝑏)   𝑅(𝑎,𝑏)   0 (𝑎,𝑏)

Proof of Theorem imasgrp

Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		imasgrp.u	. 2 ⊢ (𝜑 → 𝑈 = (𝐹 “s 𝑅))
2		imasgrp.v	. 2 ⊢ (𝜑 → 𝑉 = (Base‘𝑅))
3		imasgrp.p	. 2 ⊢ (𝜑 → + = (+g‘𝑅))
4		imasgrp.f	. 2 ⊢ (𝜑 → 𝐹:𝑉–onto→𝐵)
5		imasgrp.e	. 2 ⊢ ((𝜑 ∧ (𝑎 ∈ 𝑉 ∧ 𝑏 ∈ 𝑉) ∧ (𝑝 ∈ 𝑉 ∧ 𝑞 ∈ 𝑉)) → (((𝐹‘𝑎) = (𝐹‘𝑝) ∧ (𝐹‘𝑏) = (𝐹‘𝑞)) → (𝐹‘(𝑎 + 𝑏)) = (𝐹‘(𝑝 + 𝑞))))
6		imasgrp.r	. 2 ⊢ (𝜑 → 𝑅 ∈ Grp)
7	6	3ad2ant1 1045	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → 𝑅 ∈ Grp)
8		simp2 1025	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → 𝑥 ∈ 𝑉)
9	2	3ad2ant1 1045	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → 𝑉 = (Base‘𝑅))
10	8, 9	eleqtrd 2311	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → 𝑥 ∈ (Base‘𝑅))
11		simp3 1026	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → 𝑦 ∈ 𝑉)
12	11, 9	eleqtrd 2311	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → 𝑦 ∈ (Base‘𝑅))
13		eqid 2232	. . . . 5 ⊢ (Base‘𝑅) = (Base‘𝑅)
14		eqid 2232	. . . . 5 ⊢ (+g‘𝑅) = (+g‘𝑅)
15	13, 14	grpcl 13713	. . . 4 ⊢ ((𝑅 ∈ Grp ∧ 𝑥 ∈ (Base‘𝑅) ∧ 𝑦 ∈ (Base‘𝑅)) → (𝑥(+g‘𝑅)𝑦) ∈ (Base‘𝑅))
16	7, 10, 12, 15	syl3anc 1274	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → (𝑥(+g‘𝑅)𝑦) ∈ (Base‘𝑅))
17	3	3ad2ant1 1045	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → + = (+g‘𝑅))
18	17	oveqd 6066	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → (𝑥 + 𝑦) = (𝑥(+g‘𝑅)𝑦))
19	16, 18, 9	3eltr4d 2316	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → (𝑥 + 𝑦) ∈ 𝑉)
20	6	adantr 276	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → 𝑅 ∈ Grp)
21	10	3adant3r3 1241	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → 𝑥 ∈ (Base‘𝑅))
22	12	3adant3r3 1241	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → 𝑦 ∈ (Base‘𝑅))
23		simpr3 1032	. . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → 𝑧 ∈ 𝑉)
24	2	adantr 276	. . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → 𝑉 = (Base‘𝑅))
25	23, 24	eleqtrd 2311	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → 𝑧 ∈ (Base‘𝑅))
26	13, 14	grpass 13714	. . . . 5 ⊢ ((𝑅 ∈ Grp ∧ (𝑥 ∈ (Base‘𝑅) ∧ 𝑦 ∈ (Base‘𝑅) ∧ 𝑧 ∈ (Base‘𝑅))) → ((𝑥(+g‘𝑅)𝑦)(+g‘𝑅)𝑧) = (𝑥(+g‘𝑅)(𝑦(+g‘𝑅)𝑧)))
27	20, 21, 22, 25, 26	syl13anc 1276	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → ((𝑥(+g‘𝑅)𝑦)(+g‘𝑅)𝑧) = (𝑥(+g‘𝑅)(𝑦(+g‘𝑅)𝑧)))
28	3	adantr 276	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → + = (+g‘𝑅))
29	18	3adant3r3 1241	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → (𝑥 + 𝑦) = (𝑥(+g‘𝑅)𝑦))
30		eqidd 2233	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → 𝑧 = 𝑧)
31	28, 29, 30	oveq123d 6070	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → ((𝑥 + 𝑦) + 𝑧) = ((𝑥(+g‘𝑅)𝑦)(+g‘𝑅)𝑧))
32		eqidd 2233	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → 𝑥 = 𝑥)
33	28	oveqd 6066	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → (𝑦 + 𝑧) = (𝑦(+g‘𝑅)𝑧))
34	28, 32, 33	oveq123d 6070	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → (𝑥 + (𝑦 + 𝑧)) = (𝑥(+g‘𝑅)(𝑦(+g‘𝑅)𝑧)))
35	27, 31, 34	3eqtr4d 2275	. . 3 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → ((𝑥 + 𝑦) + 𝑧) = (𝑥 + (𝑦 + 𝑧)))
36	35	fveq2d 5673	. 2 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → (𝐹‘((𝑥 + 𝑦) + 𝑧)) = (𝐹‘(𝑥 + (𝑦 + 𝑧))))
37		imasgrp.z	. . . . 5 ⊢ 0 = (0g‘𝑅)
38	13, 37	grpidcl 13734	. . . 4 ⊢ (𝑅 ∈ Grp → 0 ∈ (Base‘𝑅))
39	6, 38	syl 14	. . 3 ⊢ (𝜑 → 0 ∈ (Base‘𝑅))
40	39, 2	eleqtrrd 2312	. 2 ⊢ (𝜑 → 0 ∈ 𝑉)
41	3	adantr 276	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → + = (+g‘𝑅))
42	41	oveqd 6066	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → ( 0 + 𝑥) = ( 0 (+g‘𝑅)𝑥))
43	2	eleq2d 2302	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝑉 ↔ 𝑥 ∈ (Base‘𝑅)))
44	43	biimpa 296	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → 𝑥 ∈ (Base‘𝑅))
45	13, 14, 37	grplid 13736	. . . . 5 ⊢ ((𝑅 ∈ Grp ∧ 𝑥 ∈ (Base‘𝑅)) → ( 0 (+g‘𝑅)𝑥) = 𝑥)
46	6, 44, 45	syl2an2r 599	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → ( 0 (+g‘𝑅)𝑥) = 𝑥)
47	42, 46	eqtrd 2265	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → ( 0 + 𝑥) = 𝑥)
48	47	fveq2d 5673	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → (𝐹‘( 0 + 𝑥)) = (𝐹‘𝑥))
49		eqid 2232	. . . . 5 ⊢ (invg‘𝑅) = (invg‘𝑅)
50	13, 49	grpinvcl 13753	. . . 4 ⊢ ((𝑅 ∈ Grp ∧ 𝑥 ∈ (Base‘𝑅)) → ((invg‘𝑅)‘𝑥) ∈ (Base‘𝑅))
51	6, 44, 50	syl2an2r 599	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → ((invg‘𝑅)‘𝑥) ∈ (Base‘𝑅))
52	2	adantr 276	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → 𝑉 = (Base‘𝑅))
53	51, 52	eleqtrrd 2312	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → ((invg‘𝑅)‘𝑥) ∈ 𝑉)
54	41	oveqd 6066	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → (((invg‘𝑅)‘𝑥) + 𝑥) = (((invg‘𝑅)‘𝑥)(+g‘𝑅)𝑥))
55	13, 14, 37, 49	grplinv 13755	. . . . 5 ⊢ ((𝑅 ∈ Grp ∧ 𝑥 ∈ (Base‘𝑅)) → (((invg‘𝑅)‘𝑥)(+g‘𝑅)𝑥) = 0 )
56	6, 44, 55	syl2an2r 599	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → (((invg‘𝑅)‘𝑥)(+g‘𝑅)𝑥) = 0 )
57	54, 56	eqtrd 2265	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → (((invg‘𝑅)‘𝑥) + 𝑥) = 0 )
58	57	fveq2d 5673	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → (𝐹‘(((invg‘𝑅)‘𝑥) + 𝑥)) = (𝐹‘ 0 ))
59	1, 2, 3, 4, 5, 6, 19, 36, 40, 48, 53, 58	imasgrp2 13819	1 ⊢ (𝜑 → (𝑈 ∈ Grp ∧ (𝐹‘ 0 ) = (0g‘𝑈)))

Syntax hints:   → wi 4   ∧ wa 104   ∧ w3a 1005   = wceq 1398   ∈ wcel 2203  –onto→wfo 5349  ‘cfv 5351  (class class class)co 6049  Basecbs 13204  +_gcplusg 13282  0_gc0g 13461   “_s cimas 13504  Grpcgrp 13705  inv_gcminusg 13706

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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-coll 4224  ax-sep 4227  ax-pow 4286  ax-pr 4321  ax-un 4553  ax-setind 4658  ax-cnex 8217  ax-resscn 8218  ax-1cn 8219  ax-1re 8220  ax-icn 8221  ax-addcl 8222  ax-addrcl 8223  ax-mulcl 8224  ax-addcom 8226  ax-addass 8228  ax-i2m1 8231  ax-0lt1 8232  ax-0id 8234  ax-rnegex 8235  ax-pre-ltirr 8238  ax-pre-lttrn 8240  ax-pre-ltadd 8242

This theorem depends on definitions:  df-bi 117  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-reu 2527  df-rmo 2528  df-rab 2529  df-v 2814  df-sbc 3042  df-csb 3138  df-dif 3212  df-un 3214  df-in 3216  df-ss 3223  df-nul 3508  df-pw 3670  df-sn 3694  df-pr 3695  df-tp 3696  df-op 3697  df-uni 3914  df-int 3949  df-iun 3992  df-br 4109  df-opab 4171  df-mpt 4172  df-id 4413  df-xp 4754  df-rel 4755  df-cnv 4756  df-co 4757  df-dm 4758  df-rn 4759  df-res 4760  df-ima 4761  df-iota 5311  df-fun 5353  df-fn 5354  df-f 5355  df-f1 5356  df-fo 5357  df-f1o 5358  df-fv 5359  df-riota 6002  df-ov 6052  df-oprab 6053  df-mpo 6054  df-pnf 8309  df-mnf 8310  df-ltxr 8312  df-inn 9237  df-2 9295  df-3 9296  df-ndx 13207  df-slot 13208  df-base 13210  df-plusg 13295  df-mulr 13296  df-0g 13463  df-iimas 13507  df-mgm 13561  df-sgrp 13607  df-mnd 13622  df-grp 13708  df-minusg 13709

This theorem is referenced by:  imasgrpf1  13821  imasabl  14045  imasring  14200