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Theorem grpinvid1 18146
Description: The inverse of a group element expressed in terms of the identity element. (Contributed by NM, 24-Aug-2011.)
Hypotheses
Ref Expression
grpinv.b 𝐵 = (Base‘𝐺)
grpinv.p + = (+g𝐺)
grpinv.u 0 = (0g𝐺)
grpinv.n 𝑁 = (invg𝐺)
Assertion
Ref Expression
grpinvid1 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ((𝑁𝑋) = 𝑌 ↔ (𝑋 + 𝑌) = 0 ))

Proof of Theorem grpinvid1
StepHypRef Expression
1 oveq2 7143 . . . 4 ((𝑁𝑋) = 𝑌 → (𝑋 + (𝑁𝑋)) = (𝑋 + 𝑌))
21adantl 485 . . 3 (((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) ∧ (𝑁𝑋) = 𝑌) → (𝑋 + (𝑁𝑋)) = (𝑋 + 𝑌))
3 grpinv.b . . . . . 6 𝐵 = (Base‘𝐺)
4 grpinv.p . . . . . 6 + = (+g𝐺)
5 grpinv.u . . . . . 6 0 = (0g𝐺)
6 grpinv.n . . . . . 6 𝑁 = (invg𝐺)
73, 4, 5, 6grprinv 18145 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑋𝐵) → (𝑋 + (𝑁𝑋)) = 0 )
873adant3 1129 . . . 4 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (𝑋 + (𝑁𝑋)) = 0 )
98adantr 484 . . 3 (((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) ∧ (𝑁𝑋) = 𝑌) → (𝑋 + (𝑁𝑋)) = 0 )
102, 9eqtr3d 2835 . 2 (((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) ∧ (𝑁𝑋) = 𝑌) → (𝑋 + 𝑌) = 0 )
11 oveq2 7143 . . . 4 ((𝑋 + 𝑌) = 0 → ((𝑁𝑋) + (𝑋 + 𝑌)) = ((𝑁𝑋) + 0 ))
1211adantl 485 . . 3 (((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) ∧ (𝑋 + 𝑌) = 0 ) → ((𝑁𝑋) + (𝑋 + 𝑌)) = ((𝑁𝑋) + 0 ))
133, 4, 5, 6grplinv 18144 . . . . . . . 8 ((𝐺 ∈ Grp ∧ 𝑋𝐵) → ((𝑁𝑋) + 𝑋) = 0 )
1413oveq1d 7150 . . . . . . 7 ((𝐺 ∈ Grp ∧ 𝑋𝐵) → (((𝑁𝑋) + 𝑋) + 𝑌) = ( 0 + 𝑌))
15143adant3 1129 . . . . . 6 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (((𝑁𝑋) + 𝑋) + 𝑌) = ( 0 + 𝑌))
163, 6grpinvcl 18143 . . . . . . . . . 10 ((𝐺 ∈ Grp ∧ 𝑋𝐵) → (𝑁𝑋) ∈ 𝐵)
1716adantrr 716 . . . . . . . . 9 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → (𝑁𝑋) ∈ 𝐵)
18 simprl 770 . . . . . . . . 9 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → 𝑋𝐵)
19 simprr 772 . . . . . . . . 9 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → 𝑌𝐵)
2017, 18, 193jca 1125 . . . . . . . 8 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → ((𝑁𝑋) ∈ 𝐵𝑋𝐵𝑌𝐵))
213, 4grpass 18104 . . . . . . . 8 ((𝐺 ∈ Grp ∧ ((𝑁𝑋) ∈ 𝐵𝑋𝐵𝑌𝐵)) → (((𝑁𝑋) + 𝑋) + 𝑌) = ((𝑁𝑋) + (𝑋 + 𝑌)))
2220, 21syldan 594 . . . . . . 7 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵)) → (((𝑁𝑋) + 𝑋) + 𝑌) = ((𝑁𝑋) + (𝑋 + 𝑌)))
23223impb 1112 . . . . . 6 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (((𝑁𝑋) + 𝑋) + 𝑌) = ((𝑁𝑋) + (𝑋 + 𝑌)))
2415, 23eqtr3d 2835 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ( 0 + 𝑌) = ((𝑁𝑋) + (𝑋 + 𝑌)))
253, 4, 5grplid 18125 . . . . . 6 ((𝐺 ∈ Grp ∧ 𝑌𝐵) → ( 0 + 𝑌) = 𝑌)
26253adant2 1128 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ( 0 + 𝑌) = 𝑌)
2724, 26eqtr3d 2835 . . . 4 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ((𝑁𝑋) + (𝑋 + 𝑌)) = 𝑌)
2827adantr 484 . . 3 (((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) ∧ (𝑋 + 𝑌) = 0 ) → ((𝑁𝑋) + (𝑋 + 𝑌)) = 𝑌)
293, 4, 5grprid 18126 . . . . . 6 ((𝐺 ∈ Grp ∧ (𝑁𝑋) ∈ 𝐵) → ((𝑁𝑋) + 0 ) = (𝑁𝑋))
3016, 29syldan 594 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑋𝐵) → ((𝑁𝑋) + 0 ) = (𝑁𝑋))
31303adant3 1129 . . . 4 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ((𝑁𝑋) + 0 ) = (𝑁𝑋))
3231adantr 484 . . 3 (((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) ∧ (𝑋 + 𝑌) = 0 ) → ((𝑁𝑋) + 0 ) = (𝑁𝑋))
3312, 28, 323eqtr3rd 2842 . 2 (((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) ∧ (𝑋 + 𝑌) = 0 ) → (𝑁𝑋) = 𝑌)
3410, 33impbida 800 1 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ((𝑁𝑋) = 𝑌 ↔ (𝑋 + 𝑌) = 0 ))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209  wa 399  w3a 1084   = wceq 1538  wcel 2111  cfv 6324  (class class class)co 7135  Basecbs 16475  +gcplusg 16557  0gc0g 16705  Grpcgrp 18095  invgcminusg 18096
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5167  ax-nul 5174  ax-pow 5231  ax-pr 5295  ax-un 7441
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ne 2988  df-ral 3111  df-rex 3112  df-reu 3113  df-rmo 3114  df-rab 3115  df-v 3443  df-sbc 3721  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-nul 4244  df-if 4426  df-pw 4499  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4801  df-br 5031  df-opab 5093  df-mpt 5111  df-id 5425  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-rn 5530  df-res 5531  df-ima 5532  df-iota 6283  df-fun 6326  df-fn 6327  df-f 6328  df-fv 6332  df-riota 7093  df-ov 7138  df-0g 16707  df-mgm 17844  df-sgrp 17893  df-mnd 17904  df-grp 18098  df-minusg 18099
This theorem is referenced by:  grpinvid  18152  grpinvcnv  18159  grpinvadd  18169  subginv  18278  qusinv  18331  ghminv  18357  symginv  18522  frgpinv  18882  cnaddinv  18984  ringnegl  19340  lmodindp1  19779  lmodvsinv2  19802  cnfldneg  20117  zringinvg  20180  mdetunilem6  21222  invrvald  21281  dchrinv  25845  baerlem3lem1  39003
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