Theorem grpinvadd 19208

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	⊢ + = (+g‘𝐺)
grpinvadd.n	⊢ 𝑁 = (invg‘𝐺)

Assertion

Ref	Expression
grpinvadd	⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑁‘(𝑋 + 𝑌)) = ((𝑁‘𝑌) + (𝑁‘𝑋)))

Proof of Theorem grpinvadd

Step	Hyp	Ref	Expression
1		simp1 1154	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → 𝐺 ∈ Grp)
2		simp2 1155	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → 𝑋 ∈ 𝐵)
3		simp3 1156	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → 𝑌 ∈ 𝐵)
4		grpinvadd.b	. . . . . . 7 ⊢ 𝐵 = (Base‘𝐺)
5		grpinvadd.n	. . . . . . 7 ⊢ 𝑁 = (invg‘𝐺)
6	4, 5	grpinvcl 19178	. . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ 𝑌 ∈ 𝐵) → (𝑁‘𝑌) ∈ 𝐵)
7	6	3adant2 1149	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑁‘𝑌) ∈ 𝐵)
8	4, 5	grpinvcl 19178	. . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑁‘𝑋) ∈ 𝐵)
9	8	3adant3 1150	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑁‘𝑋) ∈ 𝐵)
10		grpinvadd.p	. . . . . 6 ⊢ + = (+g‘𝐺)
11	4, 10	grpcl 19132	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ (𝑁‘𝑌) ∈ 𝐵 ∧ (𝑁‘𝑋) ∈ 𝐵) → ((𝑁‘𝑌) + (𝑁‘𝑋)) ∈ 𝐵)
12	1, 7, 9, 11	syl3anc 1398	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑁‘𝑌) + (𝑁‘𝑋)) ∈ 𝐵)
13	4, 10	grpass 19133	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵 ∧ ((𝑁‘𝑌) + (𝑁‘𝑋)) ∈ 𝐵)) → ((𝑋 + 𝑌) + ((𝑁‘𝑌) + (𝑁‘𝑋))) = (𝑋 + (𝑌 + ((𝑁‘𝑌) + (𝑁‘𝑋)))))
14	1, 2, 3, 12, 13	syl13anc 1399	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑋 + 𝑌) + ((𝑁‘𝑌) + (𝑁‘𝑋))) = (𝑋 + (𝑌 + ((𝑁‘𝑌) + (𝑁‘𝑋)))))
15		eqid 2761	. . . . . . . 8 ⊢ (0g‘𝐺) = (0g‘𝐺)
16	4, 10, 15, 5	grprinv 19181	. . . . . . 7 ⊢ ((𝐺 ∈ Grp ∧ 𝑌 ∈ 𝐵) → (𝑌 + (𝑁‘𝑌)) = (0g‘𝐺))
17	16	3adant2 1149	. . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑌 + (𝑁‘𝑌)) = (0g‘𝐺))
18	17	oveq1d 7427	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑌 + (𝑁‘𝑌)) + (𝑁‘𝑋)) = ((0g‘𝐺) + (𝑁‘𝑋)))
19	4, 10	grpass 19133	. . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ (𝑌 ∈ 𝐵 ∧ (𝑁‘𝑌) ∈ 𝐵 ∧ (𝑁‘𝑋) ∈ 𝐵)) → ((𝑌 + (𝑁‘𝑌)) + (𝑁‘𝑋)) = (𝑌 + ((𝑁‘𝑌) + (𝑁‘𝑋))))
20	1, 3, 7, 9, 19	syl13anc 1399	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑌 + (𝑁‘𝑌)) + (𝑁‘𝑋)) = (𝑌 + ((𝑁‘𝑌) + (𝑁‘𝑋))))
21	4, 10, 15	grplid 19158	. . . . . 6 ⊢ ((𝐺 ∈ Grp ∧ (𝑁‘𝑋) ∈ 𝐵) → ((0g‘𝐺) + (𝑁‘𝑋)) = (𝑁‘𝑋))
22	1, 9, 21	syl2anc 596	. . . . 5 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((0g‘𝐺) + (𝑁‘𝑋)) = (𝑁‘𝑋))
23	18, 20, 22	3eqtr3d 2804	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑌 + ((𝑁‘𝑌) + (𝑁‘𝑋))) = (𝑁‘𝑋))
24	23	oveq2d 7428	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 + (𝑌 + ((𝑁‘𝑌) + (𝑁‘𝑋)))) = (𝑋 + (𝑁‘𝑋)))
25	4, 10, 15, 5	grprinv 19181	. . . 4 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵) → (𝑋 + (𝑁‘𝑋)) = (0g‘𝐺))
26	25	3adant3 1150	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 + (𝑁‘𝑋)) = (0g‘𝐺))
27	14, 24, 26	3eqtrd 2800	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑋 + 𝑌) + ((𝑁‘𝑌) + (𝑁‘𝑋))) = (0g‘𝐺))
28	4, 10	grpcl 19132	. . 3 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 + 𝑌) ∈ 𝐵)
29	4, 10, 15, 5	grpinvid1 19182	. . 3 ⊢ ((𝐺 ∈ Grp ∧ (𝑋 + 𝑌) ∈ 𝐵 ∧ ((𝑁‘𝑌) + (𝑁‘𝑋)) ∈ 𝐵) → ((𝑁‘(𝑋 + 𝑌)) = ((𝑁‘𝑌) + (𝑁‘𝑋)) ↔ ((𝑋 + 𝑌) + ((𝑁‘𝑌) + (𝑁‘𝑋))) = (0g‘𝐺)))
30	1, 28, 12, 29	syl3anc 1398	. 2 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → ((𝑁‘(𝑋 + 𝑌)) = ((𝑁‘𝑌) + (𝑁‘𝑋)) ↔ ((𝑋 + 𝑌) + ((𝑁‘𝑌) + (𝑁‘𝑋))) = (0g‘𝐺)))
31	27, 30	mpbird 260	1 ⊢ ((𝐺 ∈ Grp ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑁‘(𝑋 + 𝑌)) = ((𝑁‘𝑌) + (𝑁‘𝑋)))

This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ w3a 1103   = wceq 1570   ∈ wcel 2145  ‘cfv 6531  (class class class)co 7412  Basecbs 17367  +_gcplusg 17408  0_gc0g 17590  Grpcgrp 19124  inv_gcminusg 19125

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pow 5327  ax-pr 5391  ax-un 7740

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-rmo 3366  df-reu 3367  df-rab 3414  df-v 3453  df-sbc 3740  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-iota 6487  df-fun 6533  df-fn 6534  df-f 6535  df-fv 6539  df-riota 7369  df-ov 7415  df-0g 17592  df-mgm 18796  df-sgrp 18888  df-mnd 18904  df-grp 19127  df-minusg 19128

This theorem is used by:  grpinvsub  19212  mulgaddcomlem  19287  mulginvcom  19289  mulgdir  19296  eqger  19370  eqgcpbl  19374  invoppggim  19554  sylow2blem1  19814  lsmsubg  19848  ablinvadd  20001  ablsub2inv  20002  invghm  20027  rdivmuldivd  20623  dvrcan5  33778