Theorem eqg0el 13839

Description: Equivalence class of a quotient group for a subgroup. (Contributed by Thierry Arnoux, 15-Jan-2024.)

Hypothesis

Ref	Expression
eqg0el.1	⊢ ∼ = (𝐺 ~QG 𝐻)

Assertion

Ref	Expression
eqg0el	⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ (SubGrp‘𝐺)) → ([𝑋] ∼ = 𝐻 ↔ 𝑋 ∈ 𝐻))

Proof of Theorem eqg0el

Step	Hyp	Ref	Expression
1		eqid 2230	. . . . . 6 ⊢ (Base‘𝐺) = (Base‘𝐺)
2		eqg0el.1	. . . . . 6 ⊢ ∼ = (𝐺 ~QG 𝐻)
3	1, 2	eqger 13834	. . . . 5 ⊢ (𝐻 ∈ (SubGrp‘𝐺) → ∼ Er (Base‘𝐺))
4	3	adantl 277	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ (SubGrp‘𝐺)) → ∼ Er (Base‘𝐺))
5		eqid 2230	. . . . . 6 ⊢ (0g‘𝐺) = (0g‘𝐺)
6	1, 5	grpidcl 13635	. . . . 5 ⊢ (𝐺 ∈ Grp → (0g‘𝐺) ∈ (Base‘𝐺))
7	6	adantr 276	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ (SubGrp‘𝐺)) → (0g‘𝐺) ∈ (Base‘𝐺))
8	4, 7	erth 6753	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ (SubGrp‘𝐺)) → ((0g‘𝐺) ∼ 𝑋 ↔ [(0g‘𝐺)] ∼ = [𝑋] ∼ ))
9	1, 2, 5	eqgid 13836	. . . . 5 ⊢ (𝐻 ∈ (SubGrp‘𝐺) → [(0g‘𝐺)] ∼ = 𝐻)
10	9	adantl 277	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ (SubGrp‘𝐺)) → [(0g‘𝐺)] ∼ = 𝐻)
11	10	eqeq1d 2239	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ (SubGrp‘𝐺)) → ([(0g‘𝐺)] ∼ = [𝑋] ∼ ↔ 𝐻 = [𝑋] ∼ ))
12		eqcom 2232	. . . 4 ⊢ (𝐻 = [𝑋] ∼ ↔ [𝑋] ∼ = 𝐻)
13	12	a1i 9	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ (SubGrp‘𝐺)) → (𝐻 = [𝑋] ∼ ↔ [𝑋] ∼ = 𝐻))
14	8, 11, 13	3bitrrd 215	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ (SubGrp‘𝐺)) → ([𝑋] ∼ = 𝐻 ↔ (0g‘𝐺) ∼ 𝑋))
15		errel 6716	. . . 4 ⊢ ( ∼ Er (Base‘𝐺) → Rel ∼ )
16		relelec 6749	. . . 4 ⊢ (Rel ∼ → (𝑋 ∈ [(0g‘𝐺)] ∼ ↔ (0g‘𝐺) ∼ 𝑋))
17	3, 15, 16	3syl 17	. . 3 ⊢ (𝐻 ∈ (SubGrp‘𝐺) → (𝑋 ∈ [(0g‘𝐺)] ∼ ↔ (0g‘𝐺) ∼ 𝑋))
18	17	adantl 277	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ (SubGrp‘𝐺)) → (𝑋 ∈ [(0g‘𝐺)] ∼ ↔ (0g‘𝐺) ∼ 𝑋))
19	10	eleq2d 2300	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ (SubGrp‘𝐺)) → (𝑋 ∈ [(0g‘𝐺)] ∼ ↔ 𝑋 ∈ 𝐻))
20	14, 18, 19	3bitr2d 216	1 ⊢ ((𝐺 ∈ Grp ∧ 𝐻 ∈ (SubGrp‘𝐺)) → ([𝑋] ∼ = 𝐻 ↔ 𝑋 ∈ 𝐻))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   = wceq 1397   ∈ wcel 2201   class class class wbr 4089  Rel wrel 4732  ‘cfv 5328  (class class class)co 6023   Er wer 6704  [cec 6705  Basecbs 13105  0_gc0g 13362  Grpcgrp 13606  SubGrpcsubg 13777   ~_QG cqg 13779

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2203  ax-14 2204  ax-ext 2212  ax-coll 4205  ax-sep 4208  ax-pow 4266  ax-pr 4301  ax-un 4532  ax-setind 4637  ax-cnex 8128  ax-resscn 8129  ax-1cn 8130  ax-1re 8131  ax-icn 8132  ax-addcl 8133  ax-addrcl 8134  ax-mulcl 8135  ax-addcom 8137  ax-addass 8139  ax-i2m1 8142  ax-0lt1 8143  ax-0id 8145  ax-rnegex 8146  ax-pre-ltirr 8149  ax-pre-ltadd 8153

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1810  df-eu 2081  df-mo 2082  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-ne 2402  df-nel 2497  df-ral 2514  df-rex 2515  df-reu 2516  df-rmo 2517  df-rab 2518  df-v 2803  df-sbc 3031  df-csb 3127  df-dif 3201  df-un 3203  df-in 3205  df-ss 3212  df-nul 3494  df-pw 3655  df-sn 3676  df-pr 3677  df-op 3679  df-uni 3895  df-int 3930  df-iun 3973  df-br 4090  df-opab 4152  df-mpt 4153  df-id 4392  df-xp 4733  df-rel 4734  df-cnv 4735  df-co 4736  df-dm 4737  df-rn 4738  df-res 4739  df-ima 4740  df-iota 5288  df-fun 5330  df-fn 5331  df-f 5332  df-f1 5333  df-fo 5334  df-f1o 5335  df-fv 5336  df-riota 5976  df-ov 6026  df-oprab 6027  df-mpo 6028  df-er 6707  df-ec 6709  df-pnf 8221  df-mnf 8222  df-ltxr 8224  df-inn 9149  df-2 9207  df-ndx 13108  df-slot 13109  df-base 13111  df-sets 13112  df-iress 13113  df-plusg 13196  df-0g 13364  df-mgm 13462  df-sgrp 13508  df-mnd 13523  df-grp 13609  df-minusg 13610  df-subg 13780  df-eqg 13782

This theorem is referenced by: (None)