Theorem qusecsub 14065

Description: Two subgroup cosets are equal if and only if the difference of their representatives is a member of the subgroup. (Contributed by AV, 7-Mar-2025.)

Hypotheses

Ref	Expression
qusecsub.x	|- B = ( Base ` G )
qusecsub.n	|- .- = ( -g ` G )
qusecsub.r	|- .~ = ( G ~QG S )

Assertion

Ref	Expression
qusecsub	|- ( ( ( G e. Abel /\ S e. (SubGrp ` G ) ) /\ ( X e. B /\ Y e. B ) ) -> ( [ X ] .~ = [ Y ] .~ <-> ( Y .- X ) e. S ) )

Proof of Theorem qusecsub

Step	Hyp	Ref	Expression
1		qusecsub.x	. . . . . 6 |- B = ( Base ` G )
2	1	subgss 13908	. . . . 5 |- ( S e. (SubGrp ` G ) -> S C_ B )
3	2	anim2i 342	. . . 4 |- ( ( G e. Abel /\ S e. (SubGrp ` G ) ) -> ( G e. Abel /\ S C_ B ) )
4	3	adantr 276	. . 3 |- ( ( ( G e. Abel /\ S e. (SubGrp ` G ) ) /\ ( X e. B /\ Y e. B ) ) -> ( G e. Abel /\ S C_ B ) )
5		qusecsub.n	. . . 4 |- .- = ( -g ` G )
6		qusecsub.r	. . . 4 |- .~ = ( G ~QG S )
7	1, 5, 6	eqgabl 14064	. . 3 |- ( ( G e. Abel /\ S C_ B ) -> ( X .~ Y <-> ( X e. B /\ Y e. B /\ ( Y .- X ) e. S ) ) )
8	4, 7	syl 14	. 2 |- ( ( ( G e. Abel /\ S e. (SubGrp ` G ) ) /\ ( X e. B /\ Y e. B ) ) -> ( X .~ Y <-> ( X e. B /\ Y e. B /\ ( Y .- X ) e. S ) ) )
9	1, 6	eqger 13958	. . . 4 |- ( S e. (SubGrp ` G ) -> .~ Er B )
10	9	ad2antlr 489	. . 3 |- ( ( ( G e. Abel /\ S e. (SubGrp ` G ) ) /\ ( X e. B /\ Y e. B ) ) -> .~ Er B )
11		simprl 531	. . 3 |- ( ( ( G e. Abel /\ S e. (SubGrp ` G ) ) /\ ( X e. B /\ Y e. B ) ) -> X e. B )
12	10, 11	erth 6815	. 2 |- ( ( ( G e. Abel /\ S e. (SubGrp ` G ) ) /\ ( X e. B /\ Y e. B ) ) -> ( X .~ Y <-> [ X ] .~ = [ Y ] .~ ) )
13		df-3an 1007	. . 3 |- ( ( X e. B /\ Y e. B /\ ( Y .- X ) e. S ) <-> ( ( X e. B /\ Y e. B ) /\ ( Y .- X ) e. S ) )
14		ibar 301	. . . 4 |- ( ( X e. B /\ Y e. B ) -> ( ( Y .- X ) e. S <-> ( ( X e. B /\ Y e. B ) /\ ( Y .- X ) e. S ) ) )
15	14	adantl 277	. . 3 |- ( ( ( G e. Abel /\ S e. (SubGrp ` G ) ) /\ ( X e. B /\ Y e. B ) ) -> ( ( Y .- X ) e. S <-> ( ( X e. B /\ Y e. B ) /\ ( Y .- X ) e. S ) ) )
16	13, 15	bitr4id 199	. 2 |- ( ( ( G e. Abel /\ S e. (SubGrp ` G ) ) /\ ( X e. B /\ Y e. B ) ) -> ( ( X e. B /\ Y e. B /\ ( Y .- X ) e. S ) <-> ( Y .- X ) e. S ) )
17	8, 12, 16	3bitr3d 218	1 |- ( ( ( G e. Abel /\ S e. (SubGrp ` G ) ) /\ ( X e. B /\ Y e. B ) ) -> ( [ X ] .~ = [ Y ] .~ <-> ( Y .- X ) e. S ) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   /\ w3a 1005   = wceq 1398   e. wcel 2205   C_ wss 3213   class class class wbr 4111   ` cfv 5354  (class class class)co 6052   Er wer 6766   [cec 6767   Basecbs 13229   -gcsg 13732  SubGrpcsubg 13901   ~_QG cqg 13903   Abelcabl 14019

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 2207  ax-14 2208  ax-ext 2216  ax-coll 4227  ax-sep 4230  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-setind 4661  ax-cnex 8220  ax-resscn 8221  ax-1cn 8222  ax-1re 8223  ax-icn 8224  ax-addcl 8225  ax-addrcl 8226  ax-mulcl 8227  ax-addcom 8229  ax-addass 8231  ax-i2m1 8234  ax-0lt1 8235  ax-0id 8237  ax-rnegex 8238  ax-pre-ltirr 8241  ax-pre-ltadd 8245

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3045  df-csb 3141  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-int 3952  df-iun 3995  df-br 4112  df-opab 4174  df-mpt 4175  df-id 4416  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361  df-fv 5362  df-riota 6005  df-ov 6055  df-oprab 6056  df-mpo 6057  df-1st 6336  df-2nd 6337  df-er 6769  df-ec 6771  df-pnf 8312  df-mnf 8313  df-ltxr 8315  df-inn 9240  df-2 9298  df-ndx 13232  df-slot 13233  df-base 13235  df-sets 13236  df-iress 13237  df-plusg 13320  df-0g 13488  df-mgm 13586  df-sgrp 13632  df-mnd 13647  df-grp 13733  df-minusg 13734  df-sbg 13735  df-subg 13904  df-eqg 13906  df-cmn 14020  df-abl 14021

This theorem is referenced by: (None)