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Theorem qusgrp2 17298
Description: Prove that a quotient structure is a group. (Contributed by Mario Carneiro, 14-Jun-2015.) (Revised by Mario Carneiro, 12-Aug-2015.)
Hypotheses
Ref Expression
qusgrp2.u (𝜑𝑈 = (𝑅 /s ))
qusgrp2.v (𝜑𝑉 = (Base‘𝑅))
qusgrp2.p (𝜑+ = (+g𝑅))
qusgrp2.r (𝜑 Er 𝑉)
qusgrp2.x (𝜑𝑅𝑋)
qusgrp2.e (𝜑 → ((𝑎 𝑝𝑏 𝑞) → (𝑎 + 𝑏) (𝑝 + 𝑞)))
qusgrp2.1 ((𝜑𝑥𝑉𝑦𝑉) → (𝑥 + 𝑦) ∈ 𝑉)
qusgrp2.2 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑥 + 𝑦) + 𝑧) (𝑥 + (𝑦 + 𝑧)))
qusgrp2.3 (𝜑0𝑉)
qusgrp2.4 ((𝜑𝑥𝑉) → ( 0 + 𝑥) 𝑥)
qusgrp2.5 ((𝜑𝑥𝑉) → 𝑁𝑉)
qusgrp2.6 ((𝜑𝑥𝑉) → (𝑁 + 𝑥) 0 )
Assertion
Ref Expression
qusgrp2 (𝜑 → (𝑈 ∈ Grp ∧ [ 0 ] = (0g𝑈)))
Distinct variable groups:   𝑎,𝑏,𝑝,𝑞,𝑥,𝑦,𝑧,   0 ,𝑎,𝑏,𝑝,𝑞,𝑥   𝑁,𝑝   𝑅,𝑝,𝑞   + ,𝑎,𝑏,𝑝,𝑞,𝑥,𝑦   𝜑,𝑎,𝑏,𝑝,𝑞,𝑥,𝑦,𝑧   𝑉,𝑎,𝑏,𝑝,𝑞,𝑥,𝑦,𝑧   𝑈,𝑎,𝑏,𝑝,𝑞,𝑥,𝑦,𝑧
Allowed substitution hints:   + (𝑧)   𝑅(𝑥,𝑦,𝑧,𝑎,𝑏)   𝑁(𝑥,𝑦,𝑧,𝑞,𝑎,𝑏)   𝑋(𝑥,𝑦,𝑧,𝑞,𝑝,𝑎,𝑏)   0 (𝑦,𝑧)

Proof of Theorem qusgrp2
Dummy variable 𝑢 is distinct from all other variables.
StepHypRef Expression
1 qusgrp2.u . . . 4 (𝜑𝑈 = (𝑅 /s ))
2 qusgrp2.v . . . 4 (𝜑𝑉 = (Base‘𝑅))
3 eqid 2605 . . . 4 (𝑢𝑉 ↦ [𝑢] ) = (𝑢𝑉 ↦ [𝑢] )
4 qusgrp2.r . . . . 5 (𝜑 Er 𝑉)
5 fvex 6094 . . . . . 6 (Base‘𝑅) ∈ V
62, 5syl6eqel 2691 . . . . 5 (𝜑𝑉 ∈ V)
7 erex 7626 . . . . 5 ( Er 𝑉 → (𝑉 ∈ V → ∈ V))
84, 6, 7sylc 62 . . . 4 (𝜑 ∈ V)
9 qusgrp2.x . . . 4 (𝜑𝑅𝑋)
101, 2, 3, 8, 9qusval 15967 . . 3 (𝜑𝑈 = ((𝑢𝑉 ↦ [𝑢] ) “s 𝑅))
11 qusgrp2.p . . 3 (𝜑+ = (+g𝑅))
121, 2, 3, 8, 9quslem 15968 . . 3 (𝜑 → (𝑢𝑉 ↦ [𝑢] ):𝑉onto→(𝑉 / ))
13 qusgrp2.1 . . . . 5 ((𝜑𝑥𝑉𝑦𝑉) → (𝑥 + 𝑦) ∈ 𝑉)
14133expb 1257 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉)) → (𝑥 + 𝑦) ∈ 𝑉)
15 qusgrp2.e . . . 4 (𝜑 → ((𝑎 𝑝𝑏 𝑞) → (𝑎 + 𝑏) (𝑝 + 𝑞)))
164, 6, 3, 14, 15ercpbl 15974 . . 3 ((𝜑 ∧ (𝑎𝑉𝑏𝑉) ∧ (𝑝𝑉𝑞𝑉)) → ((((𝑢𝑉 ↦ [𝑢] )‘𝑎) = ((𝑢𝑉 ↦ [𝑢] )‘𝑝) ∧ ((𝑢𝑉 ↦ [𝑢] )‘𝑏) = ((𝑢𝑉 ↦ [𝑢] )‘𝑞)) → ((𝑢𝑉 ↦ [𝑢] )‘(𝑎 + 𝑏)) = ((𝑢𝑉 ↦ [𝑢] )‘(𝑝 + 𝑞))))
174adantr 479 . . . . 5 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → Er 𝑉)
18 qusgrp2.2 . . . . 5 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑥 + 𝑦) + 𝑧) (𝑥 + (𝑦 + 𝑧)))
1917, 18erthi 7653 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → [((𝑥 + 𝑦) + 𝑧)] = [(𝑥 + (𝑦 + 𝑧))] )
206adantr 479 . . . . 5 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → 𝑉 ∈ V)
2117, 20, 3divsfval 15972 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑢𝑉 ↦ [𝑢] )‘((𝑥 + 𝑦) + 𝑧)) = [((𝑥 + 𝑦) + 𝑧)] )
2217, 20, 3divsfval 15972 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑢𝑉 ↦ [𝑢] )‘(𝑥 + (𝑦 + 𝑧))) = [(𝑥 + (𝑦 + 𝑧))] )
2319, 21, 223eqtr4d 2649 . . 3 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑢𝑉 ↦ [𝑢] )‘((𝑥 + 𝑦) + 𝑧)) = ((𝑢𝑉 ↦ [𝑢] )‘(𝑥 + (𝑦 + 𝑧))))
24 qusgrp2.3 . . 3 (𝜑0𝑉)
254adantr 479 . . . . 5 ((𝜑𝑥𝑉) → Er 𝑉)
26 qusgrp2.4 . . . . 5 ((𝜑𝑥𝑉) → ( 0 + 𝑥) 𝑥)
2725, 26erthi 7653 . . . 4 ((𝜑𝑥𝑉) → [( 0 + 𝑥)] = [𝑥] )
286adantr 479 . . . . 5 ((𝜑𝑥𝑉) → 𝑉 ∈ V)
2925, 28, 3divsfval 15972 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘( 0 + 𝑥)) = [( 0 + 𝑥)] )
3025, 28, 3divsfval 15972 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘𝑥) = [𝑥] )
3127, 29, 303eqtr4d 2649 . . 3 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘( 0 + 𝑥)) = ((𝑢𝑉 ↦ [𝑢] )‘𝑥))
32 qusgrp2.5 . . 3 ((𝜑𝑥𝑉) → 𝑁𝑉)
33 qusgrp2.6 . . . . . 6 ((𝜑𝑥𝑉) → (𝑁 + 𝑥) 0 )
3425, 33ersym 7614 . . . . 5 ((𝜑𝑥𝑉) → 0 (𝑁 + 𝑥))
3525, 34erthi 7653 . . . 4 ((𝜑𝑥𝑉) → [ 0 ] = [(𝑁 + 𝑥)] )
3625, 28, 3divsfval 15972 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = [ 0 ] )
3725, 28, 3divsfval 15972 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘(𝑁 + 𝑥)) = [(𝑁 + 𝑥)] )
3835, 36, 373eqtr4rd 2650 . . 3 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘(𝑁 + 𝑥)) = ((𝑢𝑉 ↦ [𝑢] )‘ 0 ))
3910, 2, 11, 12, 16, 9, 13, 23, 24, 31, 32, 38imasgrp2 17295 . 2 (𝜑 → (𝑈 ∈ Grp ∧ ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = (0g𝑈)))
404, 6, 3divsfval 15972 . . . . 5 (𝜑 → ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = [ 0 ] )
4140eqcomd 2611 . . . 4 (𝜑 → [ 0 ] = ((𝑢𝑉 ↦ [𝑢] )‘ 0 ))
4241eqeq1d 2607 . . 3 (𝜑 → ([ 0 ] = (0g𝑈) ↔ ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = (0g𝑈)))
4342anbi2d 735 . 2 (𝜑 → ((𝑈 ∈ Grp ∧ [ 0 ] = (0g𝑈)) ↔ (𝑈 ∈ Grp ∧ ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = (0g𝑈))))
4439, 43mpbird 245 1 (𝜑 → (𝑈 ∈ Grp ∧ [ 0 ] = (0g𝑈)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 382  w3a 1030   = wceq 1474  wcel 1975  Vcvv 3168   class class class wbr 4573  cmpt 4633  cfv 5786  (class class class)co 6523   Er wer 7599  [cec 7600   / cqs 7601  Basecbs 15637  +gcplusg 15710  0gc0g 15865   /s cqus 15930  Grpcgrp 17187
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1711  ax-4 1726  ax-5 1825  ax-6 1873  ax-7 1920  ax-8 1977  ax-9 1984  ax-10 2004  ax-11 2019  ax-12 2031  ax-13 2228  ax-ext 2585  ax-rep 4689  ax-sep 4699  ax-nul 4708  ax-pow 4760  ax-pr 4824  ax-un 6820  ax-cnex 9844  ax-resscn 9845  ax-1cn 9846  ax-icn 9847  ax-addcl 9848  ax-addrcl 9849  ax-mulcl 9850  ax-mulrcl 9851  ax-mulcom 9852  ax-addass 9853  ax-mulass 9854  ax-distr 9855  ax-i2m1 9856  ax-1ne0 9857  ax-1rid 9858  ax-rnegex 9859  ax-rrecex 9860  ax-cnre 9861  ax-pre-lttri 9862  ax-pre-lttrn 9863  ax-pre-ltadd 9864  ax-pre-mulgt0 9865
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3or 1031  df-3an 1032  df-tru 1477  df-ex 1695  df-nf 1700  df-sb 1866  df-eu 2457  df-mo 2458  df-clab 2592  df-cleq 2598  df-clel 2601  df-nfc 2735  df-ne 2777  df-nel 2778  df-ral 2896  df-rex 2897  df-reu 2898  df-rmo 2899  df-rab 2900  df-v 3170  df-sbc 3398  df-csb 3495  df-dif 3538  df-un 3540  df-in 3542  df-ss 3549  df-pss 3551  df-nul 3870  df-if 4032  df-pw 4105  df-sn 4121  df-pr 4123  df-tp 4125  df-op 4127  df-uni 4363  df-int 4401  df-iun 4447  df-br 4574  df-opab 4634  df-mpt 4635  df-tr 4671  df-eprel 4935  df-id 4939  df-po 4945  df-so 4946  df-fr 4983  df-we 4985  df-xp 5030  df-rel 5031  df-cnv 5032  df-co 5033  df-dm 5034  df-rn 5035  df-res 5036  df-ima 5037  df-pred 5579  df-ord 5625  df-on 5626  df-lim 5627  df-suc 5628  df-iota 5750  df-fun 5788  df-fn 5789  df-f 5790  df-f1 5791  df-fo 5792  df-f1o 5793  df-fv 5794  df-riota 6485  df-ov 6526  df-oprab 6527  df-mpt2 6528  df-om 6931  df-1st 7032  df-2nd 7033  df-wrecs 7267  df-recs 7328  df-rdg 7366  df-1o 7420  df-oadd 7424  df-er 7602  df-ec 7604  df-qs 7608  df-en 7815  df-dom 7816  df-sdom 7817  df-fin 7818  df-sup 8204  df-inf 8205  df-pnf 9928  df-mnf 9929  df-xr 9930  df-ltxr 9931  df-le 9932  df-sub 10115  df-neg 10116  df-nn 10864  df-2 10922  df-3 10923  df-4 10924  df-5 10925  df-6 10926  df-7 10927  df-8 10928  df-9 10929  df-n0 11136  df-z 11207  df-dec 11322  df-uz 11516  df-fz 12149  df-struct 15639  df-ndx 15640  df-slot 15641  df-base 15642  df-plusg 15723  df-mulr 15724  df-sca 15726  df-vsca 15727  df-ip 15728  df-tset 15729  df-ple 15730  df-ds 15733  df-0g 15867  df-imas 15933  df-qus 15934  df-mgm 17007  df-sgrp 17049  df-mnd 17060  df-grp 17190
This theorem is referenced by:  qusgrp  17414  frgp0  17938  pi1grplem  22584
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