Theorem imasgrp 13828

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 13721	. . . 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 6067	. . 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 13722	. . . . 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 6071	. . . 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 6067	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉)) → (𝑦 + 𝑧) = (𝑦(+g‘𝑅)𝑧))
34	28, 32, 33	oveq123d 6071	. . . 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 5674	. 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 13742	. . . 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 6067	. . . 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 13744	. . . . 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 5674	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → (𝐹‘( 0 + 𝑥)) = (𝐹‘𝑥))
49		eqid 2232	. . . . 5 ⊢ (invg‘𝑅) = (invg‘𝑅)
50	13, 49	grpinvcl 13761	. . . 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 6067	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑉) → (((invg‘𝑅)‘𝑥) + 𝑥) = (((invg‘𝑅)‘𝑥)(+g‘𝑅)𝑥))
55	13, 14, 37, 49	grplinv 13763	. . . . 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 5674	. 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 13827	1 ⊢ (𝜑 → (𝑈 ∈ Grp ∧ (𝐹‘ 0 ) = (0g‘𝑈)))

Syntax hints:   → wi 4   ∧ wa 104   ∧ w3a 1005   = wceq 1398   ∈ wcel 2203  –onto→wfo 5350  ‘cfv 5352  (class class class)co 6050  Basecbs 13212  +_gcplusg 13290  0_gc0g 13469   “_s cimas 13512  Grpcgrp 13713  inv_gcminusg 13714

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 4225  ax-sep 4228  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659  ax-cnex 8218  ax-resscn 8219  ax-1cn 8220  ax-1re 8221  ax-icn 8222  ax-addcl 8223  ax-addrcl 8224  ax-mulcl 8225  ax-addcom 8227  ax-addass 8229  ax-i2m1 8232  ax-0lt1 8233  ax-0id 8235  ax-rnegex 8236  ax-pre-ltirr 8239  ax-pre-lttrn 8241  ax-pre-ltadd 8243

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 2815  df-sbc 3043  df-csb 3139  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-nul 3509  df-pw 3671  df-sn 3695  df-pr 3696  df-tp 3697  df-op 3698  df-uni 3915  df-int 3950  df-iun 3993  df-br 4110  df-opab 4172  df-mpt 4173  df-id 4414  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-f1 5357  df-fo 5358  df-f1o 5359  df-fv 5360  df-riota 6003  df-ov 6053  df-oprab 6054  df-mpo 6055  df-pnf 8310  df-mnf 8311  df-ltxr 8313  df-inn 9238  df-2 9296  df-3 9297  df-ndx 13215  df-slot 13216  df-base 13218  df-plusg 13303  df-mulr 13304  df-0g 13471  df-iimas 13515  df-mgm 13569  df-sgrp 13615  df-mnd 13630  df-grp 13716  df-minusg 13717

This theorem is referenced by:  imasgrpf1  13829  imasabl  14053  imasring  14208