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Theorem qusgrp2 18162
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 2826 . . . 4 (𝑢𝑉 ↦ [𝑢] ) = (𝑢𝑉 ↦ [𝑢] )
4 qusgrp2.r . . . . 5 (𝜑 Er 𝑉)
5 fvex 6682 . . . . . 6 (Base‘𝑅) ∈ V
62, 5syl6eqel 2926 . . . . 5 (𝜑𝑉 ∈ V)
7 erex 8308 . . . . 5 ( Er 𝑉 → (𝑉 ∈ V → ∈ V))
84, 6, 7sylc 65 . . . 4 (𝜑 ∈ V)
9 qusgrp2.x . . . 4 (𝜑𝑅𝑋)
101, 2, 3, 8, 9qusval 16810 . . 3 (𝜑𝑈 = ((𝑢𝑉 ↦ [𝑢] ) “s 𝑅))
11 qusgrp2.p . . 3 (𝜑+ = (+g𝑅))
121, 2, 3, 8, 9quslem 16811 . . 3 (𝜑 → (𝑢𝑉 ↦ [𝑢] ):𝑉onto→(𝑉 / ))
13 qusgrp2.1 . . . . 5 ((𝜑𝑥𝑉𝑦𝑉) → (𝑥 + 𝑦) ∈ 𝑉)
14133expb 1114 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉)) → (𝑥 + 𝑦) ∈ 𝑉)
15 qusgrp2.e . . . 4 (𝜑 → ((𝑎 𝑝𝑏 𝑞) → (𝑎 + 𝑏) (𝑝 + 𝑞)))
164, 6, 3, 14, 15ercpbl 16817 . . 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 481 . . . . 5 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → Er 𝑉)
18 qusgrp2.2 . . . . 5 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑥 + 𝑦) + 𝑧) (𝑥 + (𝑦 + 𝑧)))
1917, 18erthi 8335 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → [((𝑥 + 𝑦) + 𝑧)] = [(𝑥 + (𝑦 + 𝑧))] )
206adantr 481 . . . . 5 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → 𝑉 ∈ V)
2117, 20, 3divsfval 16815 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑢𝑉 ↦ [𝑢] )‘((𝑥 + 𝑦) + 𝑧)) = [((𝑥 + 𝑦) + 𝑧)] )
2217, 20, 3divsfval 16815 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑢𝑉 ↦ [𝑢] )‘(𝑥 + (𝑦 + 𝑧))) = [(𝑥 + (𝑦 + 𝑧))] )
2319, 21, 223eqtr4d 2871 . . 3 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑢𝑉 ↦ [𝑢] )‘((𝑥 + 𝑦) + 𝑧)) = ((𝑢𝑉 ↦ [𝑢] )‘(𝑥 + (𝑦 + 𝑧))))
24 qusgrp2.3 . . 3 (𝜑0𝑉)
254adantr 481 . . . . 5 ((𝜑𝑥𝑉) → Er 𝑉)
26 qusgrp2.4 . . . . 5 ((𝜑𝑥𝑉) → ( 0 + 𝑥) 𝑥)
2725, 26erthi 8335 . . . 4 ((𝜑𝑥𝑉) → [( 0 + 𝑥)] = [𝑥] )
286adantr 481 . . . . 5 ((𝜑𝑥𝑉) → 𝑉 ∈ V)
2925, 28, 3divsfval 16815 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘( 0 + 𝑥)) = [( 0 + 𝑥)] )
3025, 28, 3divsfval 16815 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘𝑥) = [𝑥] )
3127, 29, 303eqtr4d 2871 . . 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 8296 . . . . 5 ((𝜑𝑥𝑉) → 0 (𝑁 + 𝑥))
3525, 34erthi 8335 . . . 4 ((𝜑𝑥𝑉) → [ 0 ] = [(𝑁 + 𝑥)] )
3625, 28, 3divsfval 16815 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = [ 0 ] )
3725, 28, 3divsfval 16815 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘(𝑁 + 𝑥)) = [(𝑁 + 𝑥)] )
3835, 36, 373eqtr4rd 2872 . . 3 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘(𝑁 + 𝑥)) = ((𝑢𝑉 ↦ [𝑢] )‘ 0 ))
3910, 2, 11, 12, 16, 9, 13, 23, 24, 31, 32, 38imasgrp2 18159 . 2 (𝜑 → (𝑈 ∈ Grp ∧ ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = (0g𝑈)))
404, 6, 3divsfval 16815 . . . . 5 (𝜑 → ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = [ 0 ] )
4140eqcomd 2832 . . . 4 (𝜑 → [ 0 ] = ((𝑢𝑉 ↦ [𝑢] )‘ 0 ))
4241eqeq1d 2828 . . 3 (𝜑 → ([ 0 ] = (0g𝑈) ↔ ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = (0g𝑈)))
4342anbi2d 628 . 2 (𝜑 → ((𝑈 ∈ Grp ∧ [ 0 ] = (0g𝑈)) ↔ (𝑈 ∈ Grp ∧ ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = (0g𝑈))))
4439, 43mpbird 258 1 (𝜑 → (𝑈 ∈ Grp ∧ [ 0 ] = (0g𝑈)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396  w3a 1081   = wceq 1530  wcel 2107  Vcvv 3500   class class class wbr 5063  cmpt 5143  cfv 6354  (class class class)co 7150   Er wer 8281  [cec 8282   / cqs 8283  Basecbs 16478  +gcplusg 16560  0gc0g 16708   /s cqus 16773  Grpcgrp 18048
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2153  ax-12 2169  ax-ext 2798  ax-rep 5187  ax-sep 5200  ax-nul 5207  ax-pow 5263  ax-pr 5326  ax-un 7455  ax-cnex 10587  ax-resscn 10588  ax-1cn 10589  ax-icn 10590  ax-addcl 10591  ax-addrcl 10592  ax-mulcl 10593  ax-mulrcl 10594  ax-mulcom 10595  ax-addass 10596  ax-mulass 10597  ax-distr 10598  ax-i2m1 10599  ax-1ne0 10600  ax-1rid 10601  ax-rnegex 10602  ax-rrecex 10603  ax-cnre 10604  ax-pre-lttri 10605  ax-pre-lttrn 10606  ax-pre-ltadd 10607  ax-pre-mulgt0 10608
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-3or 1082  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2620  df-eu 2652  df-clab 2805  df-cleq 2819  df-clel 2898  df-nfc 2968  df-ne 3022  df-nel 3129  df-ral 3148  df-rex 3149  df-reu 3150  df-rmo 3151  df-rab 3152  df-v 3502  df-sbc 3777  df-csb 3888  df-dif 3943  df-un 3945  df-in 3947  df-ss 3956  df-pss 3958  df-nul 4296  df-if 4471  df-pw 4544  df-sn 4565  df-pr 4567  df-tp 4569  df-op 4571  df-uni 4838  df-int 4875  df-iun 4919  df-br 5064  df-opab 5126  df-mpt 5144  df-tr 5170  df-id 5459  df-eprel 5464  df-po 5473  df-so 5474  df-fr 5513  df-we 5515  df-xp 5560  df-rel 5561  df-cnv 5562  df-co 5563  df-dm 5564  df-rn 5565  df-res 5566  df-ima 5567  df-pred 6147  df-ord 6193  df-on 6194  df-lim 6195  df-suc 6196  df-iota 6313  df-fun 6356  df-fn 6357  df-f 6358  df-f1 6359  df-fo 6360  df-f1o 6361  df-fv 6362  df-riota 7108  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7574  df-1st 7685  df-2nd 7686  df-wrecs 7943  df-recs 8004  df-rdg 8042  df-1o 8098  df-oadd 8102  df-er 8284  df-ec 8286  df-qs 8290  df-en 8504  df-dom 8505  df-sdom 8506  df-fin 8507  df-sup 8900  df-inf 8901  df-pnf 10671  df-mnf 10672  df-xr 10673  df-ltxr 10674  df-le 10675  df-sub 10866  df-neg 10867  df-nn 11633  df-2 11694  df-3 11695  df-4 11696  df-5 11697  df-6 11698  df-7 11699  df-8 11700  df-9 11701  df-n0 11892  df-z 11976  df-dec 12093  df-uz 12238  df-fz 12888  df-struct 16480  df-ndx 16481  df-slot 16482  df-base 16484  df-plusg 16573  df-mulr 16574  df-sca 16576  df-vsca 16577  df-ip 16578  df-tset 16579  df-ple 16580  df-ds 16582  df-0g 16710  df-imas 16776  df-qus 16777  df-mgm 17847  df-sgrp 17896  df-mnd 17907  df-grp 18051
This theorem is referenced by:  qusgrp  18280  frgp0  18822  pi1grplem  23587
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