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Theorem grpinvadd 18634
Description: The inverse of the group operation reverses the arguments. Lemma 2.2.1(d) of [Herstein] p. 55. (Contributed by NM, 27-Oct-2006.)
Hypotheses
Ref Expression
grpinvadd.b 𝐵 = (Base‘𝐺)
grpinvadd.p + = (+g𝐺)
grpinvadd.n 𝑁 = (invg𝐺)
Assertion
Ref Expression
grpinvadd ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (𝑁‘(𝑋 + 𝑌)) = ((𝑁𝑌) + (𝑁𝑋)))

Proof of Theorem grpinvadd
StepHypRef Expression
1 simp1 1134 . . . 4 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → 𝐺 ∈ Grp)
2 simp2 1135 . . . 4 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → 𝑋𝐵)
3 simp3 1136 . . . 4 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → 𝑌𝐵)
4 grpinvadd.b . . . . . . 7 𝐵 = (Base‘𝐺)
5 grpinvadd.n . . . . . . 7 𝑁 = (invg𝐺)
64, 5grpinvcl 18608 . . . . . 6 ((𝐺 ∈ Grp ∧ 𝑌𝐵) → (𝑁𝑌) ∈ 𝐵)
763adant2 1129 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (𝑁𝑌) ∈ 𝐵)
84, 5grpinvcl 18608 . . . . . 6 ((𝐺 ∈ Grp ∧ 𝑋𝐵) → (𝑁𝑋) ∈ 𝐵)
983adant3 1130 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (𝑁𝑋) ∈ 𝐵)
10 grpinvadd.p . . . . . 6 + = (+g𝐺)
114, 10grpcl 18566 . . . . 5 ((𝐺 ∈ Grp ∧ (𝑁𝑌) ∈ 𝐵 ∧ (𝑁𝑋) ∈ 𝐵) → ((𝑁𝑌) + (𝑁𝑋)) ∈ 𝐵)
121, 7, 9, 11syl3anc 1369 . . . 4 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ((𝑁𝑌) + (𝑁𝑋)) ∈ 𝐵)
134, 10grpass 18567 . . . 4 ((𝐺 ∈ Grp ∧ (𝑋𝐵𝑌𝐵 ∧ ((𝑁𝑌) + (𝑁𝑋)) ∈ 𝐵)) → ((𝑋 + 𝑌) + ((𝑁𝑌) + (𝑁𝑋))) = (𝑋 + (𝑌 + ((𝑁𝑌) + (𝑁𝑋)))))
141, 2, 3, 12, 13syl13anc 1370 . . 3 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ((𝑋 + 𝑌) + ((𝑁𝑌) + (𝑁𝑋))) = (𝑋 + (𝑌 + ((𝑁𝑌) + (𝑁𝑋)))))
15 eqid 2739 . . . . . . . 8 (0g𝐺) = (0g𝐺)
164, 10, 15, 5grprinv 18610 . . . . . . 7 ((𝐺 ∈ Grp ∧ 𝑌𝐵) → (𝑌 + (𝑁𝑌)) = (0g𝐺))
17163adant2 1129 . . . . . 6 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (𝑌 + (𝑁𝑌)) = (0g𝐺))
1817oveq1d 7283 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ((𝑌 + (𝑁𝑌)) + (𝑁𝑋)) = ((0g𝐺) + (𝑁𝑋)))
194, 10grpass 18567 . . . . . 6 ((𝐺 ∈ Grp ∧ (𝑌𝐵 ∧ (𝑁𝑌) ∈ 𝐵 ∧ (𝑁𝑋) ∈ 𝐵)) → ((𝑌 + (𝑁𝑌)) + (𝑁𝑋)) = (𝑌 + ((𝑁𝑌) + (𝑁𝑋))))
201, 3, 7, 9, 19syl13anc 1370 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ((𝑌 + (𝑁𝑌)) + (𝑁𝑋)) = (𝑌 + ((𝑁𝑌) + (𝑁𝑋))))
214, 10, 15grplid 18590 . . . . . 6 ((𝐺 ∈ Grp ∧ (𝑁𝑋) ∈ 𝐵) → ((0g𝐺) + (𝑁𝑋)) = (𝑁𝑋))
221, 9, 21syl2anc 583 . . . . 5 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ((0g𝐺) + (𝑁𝑋)) = (𝑁𝑋))
2318, 20, 223eqtr3d 2787 . . . 4 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (𝑌 + ((𝑁𝑌) + (𝑁𝑋))) = (𝑁𝑋))
2423oveq2d 7284 . . 3 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (𝑋 + (𝑌 + ((𝑁𝑌) + (𝑁𝑋)))) = (𝑋 + (𝑁𝑋)))
254, 10, 15, 5grprinv 18610 . . . 4 ((𝐺 ∈ Grp ∧ 𝑋𝐵) → (𝑋 + (𝑁𝑋)) = (0g𝐺))
26253adant3 1130 . . 3 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (𝑋 + (𝑁𝑋)) = (0g𝐺))
2714, 24, 263eqtrd 2783 . 2 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ((𝑋 + 𝑌) + ((𝑁𝑌) + (𝑁𝑋))) = (0g𝐺))
284, 10grpcl 18566 . . 3 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (𝑋 + 𝑌) ∈ 𝐵)
294, 10, 15, 5grpinvid1 18611 . . 3 ((𝐺 ∈ Grp ∧ (𝑋 + 𝑌) ∈ 𝐵 ∧ ((𝑁𝑌) + (𝑁𝑋)) ∈ 𝐵) → ((𝑁‘(𝑋 + 𝑌)) = ((𝑁𝑌) + (𝑁𝑋)) ↔ ((𝑋 + 𝑌) + ((𝑁𝑌) + (𝑁𝑋))) = (0g𝐺)))
301, 28, 12, 29syl3anc 1369 . 2 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → ((𝑁‘(𝑋 + 𝑌)) = ((𝑁𝑌) + (𝑁𝑋)) ↔ ((𝑋 + 𝑌) + ((𝑁𝑌) + (𝑁𝑋))) = (0g𝐺)))
3127, 30mpbird 256 1 ((𝐺 ∈ Grp ∧ 𝑋𝐵𝑌𝐵) → (𝑁‘(𝑋 + 𝑌)) = ((𝑁𝑌) + (𝑁𝑋)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  w3a 1085   = wceq 1541  wcel 2109  cfv 6430  (class class class)co 7268  Basecbs 16893  +gcplusg 16943  0gc0g 17131  Grpcgrp 18558  invgcminusg 18559
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1801  ax-4 1815  ax-5 1916  ax-6 1974  ax-7 2014  ax-8 2111  ax-9 2119  ax-10 2140  ax-11 2157  ax-12 2174  ax-ext 2710  ax-sep 5226  ax-nul 5233  ax-pow 5291  ax-pr 5355  ax-un 7579
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1544  df-fal 1554  df-ex 1786  df-nf 1790  df-sb 2071  df-mo 2541  df-eu 2570  df-clab 2717  df-cleq 2731  df-clel 2817  df-nfc 2890  df-ne 2945  df-ral 3070  df-rex 3071  df-reu 3072  df-rmo 3073  df-rab 3074  df-v 3432  df-sbc 3720  df-dif 3894  df-un 3896  df-in 3898  df-ss 3908  df-nul 4262  df-if 4465  df-pw 4540  df-sn 4567  df-pr 4569  df-op 4573  df-uni 4845  df-br 5079  df-opab 5141  df-mpt 5162  df-id 5488  df-xp 5594  df-rel 5595  df-cnv 5596  df-co 5597  df-dm 5598  df-rn 5599  df-res 5600  df-ima 5601  df-iota 6388  df-fun 6432  df-fn 6433  df-f 6434  df-fv 6438  df-riota 7225  df-ov 7271  df-0g 17133  df-mgm 18307  df-sgrp 18356  df-mnd 18367  df-grp 18561  df-minusg 18562
This theorem is referenced by:  grpinvsub  18638  mulgaddcomlem  18707  mulginvcom  18709  mulgdir  18716  eqger  18787  eqgcpbl  18791  invoppggim  18948  sylow2blem1  19206  lsmsubg  19240  ablinvadd  19392  ablsub2inv  19393  invghm  19416  rdivmuldivd  31467  dvrcan5  31469
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