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Theorem qusgrp2 17356
 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 2610 . . . 4 (𝑢𝑉 ↦ [𝑢] ) = (𝑢𝑉 ↦ [𝑢] )
4 qusgrp2.r . . . . 5 (𝜑 Er 𝑉)
5 fvex 6113 . . . . . 6 (Base‘𝑅) ∈ V
62, 5syl6eqel 2696 . . . . 5 (𝜑𝑉 ∈ V)
7 erex 7653 . . . . 5 ( Er 𝑉 → (𝑉 ∈ V → ∈ V))
84, 6, 7sylc 63 . . . 4 (𝜑 ∈ V)
9 qusgrp2.x . . . 4 (𝜑𝑅𝑋)
101, 2, 3, 8, 9qusval 16025 . . 3 (𝜑𝑈 = ((𝑢𝑉 ↦ [𝑢] ) “s 𝑅))
11 qusgrp2.p . . 3 (𝜑+ = (+g𝑅))
121, 2, 3, 8, 9quslem 16026 . . 3 (𝜑 → (𝑢𝑉 ↦ [𝑢] ):𝑉onto→(𝑉 / ))
13 qusgrp2.1 . . . . 5 ((𝜑𝑥𝑉𝑦𝑉) → (𝑥 + 𝑦) ∈ 𝑉)
14133expb 1258 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉)) → (𝑥 + 𝑦) ∈ 𝑉)
15 qusgrp2.e . . . 4 (𝜑 → ((𝑎 𝑝𝑏 𝑞) → (𝑎 + 𝑏) (𝑝 + 𝑞)))
164, 6, 3, 14, 15ercpbl 16032 . . 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 480 . . . . 5 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → Er 𝑉)
18 qusgrp2.2 . . . . 5 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑥 + 𝑦) + 𝑧) (𝑥 + (𝑦 + 𝑧)))
1917, 18erthi 7680 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → [((𝑥 + 𝑦) + 𝑧)] = [(𝑥 + (𝑦 + 𝑧))] )
206adantr 480 . . . . 5 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → 𝑉 ∈ V)
2117, 20, 3divsfval 16030 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑢𝑉 ↦ [𝑢] )‘((𝑥 + 𝑦) + 𝑧)) = [((𝑥 + 𝑦) + 𝑧)] )
2217, 20, 3divsfval 16030 . . . 4 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑢𝑉 ↦ [𝑢] )‘(𝑥 + (𝑦 + 𝑧))) = [(𝑥 + (𝑦 + 𝑧))] )
2319, 21, 223eqtr4d 2654 . . 3 ((𝜑 ∧ (𝑥𝑉𝑦𝑉𝑧𝑉)) → ((𝑢𝑉 ↦ [𝑢] )‘((𝑥 + 𝑦) + 𝑧)) = ((𝑢𝑉 ↦ [𝑢] )‘(𝑥 + (𝑦 + 𝑧))))
24 qusgrp2.3 . . 3 (𝜑0𝑉)
254adantr 480 . . . . 5 ((𝜑𝑥𝑉) → Er 𝑉)
26 qusgrp2.4 . . . . 5 ((𝜑𝑥𝑉) → ( 0 + 𝑥) 𝑥)
2725, 26erthi 7680 . . . 4 ((𝜑𝑥𝑉) → [( 0 + 𝑥)] = [𝑥] )
286adantr 480 . . . . 5 ((𝜑𝑥𝑉) → 𝑉 ∈ V)
2925, 28, 3divsfval 16030 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘( 0 + 𝑥)) = [( 0 + 𝑥)] )
3025, 28, 3divsfval 16030 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘𝑥) = [𝑥] )
3127, 29, 303eqtr4d 2654 . . 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 7641 . . . . 5 ((𝜑𝑥𝑉) → 0 (𝑁 + 𝑥))
3525, 34erthi 7680 . . . 4 ((𝜑𝑥𝑉) → [ 0 ] = [(𝑁 + 𝑥)] )
3625, 28, 3divsfval 16030 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = [ 0 ] )
3725, 28, 3divsfval 16030 . . . 4 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘(𝑁 + 𝑥)) = [(𝑁 + 𝑥)] )
3835, 36, 373eqtr4rd 2655 . . 3 ((𝜑𝑥𝑉) → ((𝑢𝑉 ↦ [𝑢] )‘(𝑁 + 𝑥)) = ((𝑢𝑉 ↦ [𝑢] )‘ 0 ))
3910, 2, 11, 12, 16, 9, 13, 23, 24, 31, 32, 38imasgrp2 17353 . 2 (𝜑 → (𝑈 ∈ Grp ∧ ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = (0g𝑈)))
404, 6, 3divsfval 16030 . . . . 5 (𝜑 → ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = [ 0 ] )
4140eqcomd 2616 . . . 4 (𝜑 → [ 0 ] = ((𝑢𝑉 ↦ [𝑢] )‘ 0 ))
4241eqeq1d 2612 . . 3 (𝜑 → ([ 0 ] = (0g𝑈) ↔ ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = (0g𝑈)))
4342anbi2d 736 . 2 (𝜑 → ((𝑈 ∈ Grp ∧ [ 0 ] = (0g𝑈)) ↔ (𝑈 ∈ Grp ∧ ((𝑢𝑉 ↦ [𝑢] )‘ 0 ) = (0g𝑈))))
4439, 43mpbird 246 1 (𝜑 → (𝑈 ∈ Grp ∧ [ 0 ] = (0g𝑈)))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977  Vcvv 3173   class class class wbr 4583   ↦ cmpt 4643  ‘cfv 5804  (class class class)co 6549   Er wer 7626  [cec 7627   / cqs 7628  Basecbs 15695  +gcplusg 15768  0gc0g 15923   /s cqus 15988  Grpcgrp 17245 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-oadd 7451  df-er 7629  df-ec 7631  df-qs 7635  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-sup 8231  df-inf 8232  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-2 10956  df-3 10957  df-4 10958  df-5 10959  df-6 10960  df-7 10961  df-8 10962  df-9 10963  df-n0 11170  df-z 11255  df-dec 11370  df-uz 11564  df-fz 12198  df-struct 15697  df-ndx 15698  df-slot 15699  df-base 15700  df-plusg 15781  df-mulr 15782  df-sca 15784  df-vsca 15785  df-ip 15786  df-tset 15787  df-ple 15788  df-ds 15791  df-0g 15925  df-imas 15991  df-qus 15992  df-mgm 17065  df-sgrp 17107  df-mnd 17118  df-grp 17248 This theorem is referenced by:  qusgrp  17472  frgp0  17996  pi1grplem  22657
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