Theorem gsumwrev 18494

Description: A sum in an opposite monoid is the regular sum of a reversed word. (Contributed by Stefan O'Rear, 27-Aug-2015.) (Proof shortened by Mario Carneiro, 28-Feb-2016.)

Hypotheses

Ref	Expression
gsumwrev.b	⊢ 𝐵 = (Base‘𝑀)
gsumwrev.o	⊢ 𝑂 = (oppg‘𝑀)

Assertion

Ref	Expression
gsumwrev	⊢ ((𝑀 ∈ Mnd ∧ 𝑊 ∈ Word 𝐵) → (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊)))

Proof of Theorem gsumwrev

Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		oveq2 7164	. . . . 5 ⊢ (𝑥 = ∅ → (𝑂 Σg 𝑥) = (𝑂 Σg ∅))
2		fveq2 6670	. . . . . . 7 ⊢ (𝑥 = ∅ → (reverse‘𝑥) = (reverse‘∅))
3		rev0 14126	. . . . . . 7 ⊢ (reverse‘∅) = ∅
4	2, 3	syl6eq 2872	. . . . . 6 ⊢ (𝑥 = ∅ → (reverse‘𝑥) = ∅)
5	4	oveq2d 7172	. . . . 5 ⊢ (𝑥 = ∅ → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg ∅))
6	1, 5	eqeq12d 2837	. . . 4 ⊢ (𝑥 = ∅ → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg ∅) = (𝑀 Σg ∅)))
7	6	imbi2d 343	. . 3 ⊢ (𝑥 = ∅ → ((𝑀 ∈ Mnd → (𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥))) ↔ (𝑀 ∈ Mnd → (𝑂 Σg ∅) = (𝑀 Σg ∅))))
8		oveq2 7164	. . . . 5 ⊢ (𝑥 = 𝑦 → (𝑂 Σg 𝑥) = (𝑂 Σg 𝑦))
9		fveq2 6670	. . . . . 6 ⊢ (𝑥 = 𝑦 → (reverse‘𝑥) = (reverse‘𝑦))
10	9	oveq2d 7172	. . . . 5 ⊢ (𝑥 = 𝑦 → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘𝑦)))
11	8, 10	eqeq12d 2837	. . . 4 ⊢ (𝑥 = 𝑦 → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦))))
12	11	imbi2d 343	. . 3 ⊢ (𝑥 = 𝑦 → ((𝑀 ∈ Mnd → (𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥))) ↔ (𝑀 ∈ Mnd → (𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦)))))
13		oveq2 7164	. . . . 5 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (𝑂 Σg 𝑥) = (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)))
14		fveq2 6670	. . . . . 6 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (reverse‘𝑥) = (reverse‘(𝑦 ++ ⟨“𝑧”⟩)))
15	14	oveq2d 7172	. . . . 5 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))))
16	13, 15	eqeq12d 2837	. . . 4 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩)))))
17	16	imbi2d 343	. . 3 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → ((𝑀 ∈ Mnd → (𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥))) ↔ (𝑀 ∈ Mnd → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))))))
18		oveq2 7164	. . . . 5 ⊢ (𝑥 = 𝑊 → (𝑂 Σg 𝑥) = (𝑂 Σg 𝑊))
19		fveq2 6670	. . . . . 6 ⊢ (𝑥 = 𝑊 → (reverse‘𝑥) = (reverse‘𝑊))
20	19	oveq2d 7172	. . . . 5 ⊢ (𝑥 = 𝑊 → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘𝑊)))
21	18, 20	eqeq12d 2837	. . . 4 ⊢ (𝑥 = 𝑊 → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊))))
22	21	imbi2d 343	. . 3 ⊢ (𝑥 = 𝑊 → ((𝑀 ∈ Mnd → (𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥))) ↔ (𝑀 ∈ Mnd → (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊)))))
23		gsumwrev.o	. . . . . . 7 ⊢ 𝑂 = (oppg‘𝑀)
24		eqid 2821	. . . . . . 7 ⊢ (0g‘𝑀) = (0g‘𝑀)
25	23, 24	oppgid 18484	. . . . . 6 ⊢ (0g‘𝑀) = (0g‘𝑂)
26	25	gsum0 17894	. . . . 5 ⊢ (𝑂 Σg ∅) = (0g‘𝑀)
27	24	gsum0 17894	. . . . 5 ⊢ (𝑀 Σg ∅) = (0g‘𝑀)
28	26, 27	eqtr4i 2847	. . . 4 ⊢ (𝑂 Σg ∅) = (𝑀 Σg ∅)
29	28	a1i 11	. . 3 ⊢ (𝑀 ∈ Mnd → (𝑂 Σg ∅) = (𝑀 Σg ∅))
30		oveq2 7164	. . . . . 6 ⊢ ((𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦)) → (𝑧(+g‘𝑀)(𝑂 Σg 𝑦)) = (𝑧(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))))
31	23	oppgmnd 18482	. . . . . . . . . 10 ⊢ (𝑀 ∈ Mnd → 𝑂 ∈ Mnd)
32	31	adantr 483	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑂 ∈ Mnd)
33		simprl 769	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑦 ∈ Word 𝐵)
34		simprr 771	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑧 ∈ 𝐵)
35	34	s1cld 13957	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ⟨“𝑧”⟩ ∈ Word 𝐵)
36		gsumwrev.b	. . . . . . . . . . 11 ⊢ 𝐵 = (Base‘𝑀)
37	23, 36	oppgbas 18479	. . . . . . . . . 10 ⊢ 𝐵 = (Base‘𝑂)
38		eqid 2821	. . . . . . . . . 10 ⊢ (+g‘𝑂) = (+g‘𝑂)
39	37, 38	gsumccat 18006	. . . . . . . . 9 ⊢ ((𝑂 ∈ Mnd ∧ 𝑦 ∈ Word 𝐵 ∧ ⟨“𝑧”⟩ ∈ Word 𝐵) → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = ((𝑂 Σg 𝑦)(+g‘𝑂)(𝑂 Σg ⟨“𝑧”⟩)))
40	32, 33, 35, 39	syl3anc 1367	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = ((𝑂 Σg 𝑦)(+g‘𝑂)(𝑂 Σg ⟨“𝑧”⟩)))
41	37	gsumws1 18002	. . . . . . . . . . 11 ⊢ (𝑧 ∈ 𝐵 → (𝑂 Σg ⟨“𝑧”⟩) = 𝑧)
42	41	ad2antll 727	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg ⟨“𝑧”⟩) = 𝑧)
43	42	oveq2d 7172	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑂 Σg 𝑦)(+g‘𝑂)(𝑂 Σg ⟨“𝑧”⟩)) = ((𝑂 Σg 𝑦)(+g‘𝑂)𝑧))
44		eqid 2821	. . . . . . . . . 10 ⊢ (+g‘𝑀) = (+g‘𝑀)
45	44, 23, 38	oppgplus 18477	. . . . . . . . 9 ⊢ ((𝑂 Σg 𝑦)(+g‘𝑂)𝑧) = (𝑧(+g‘𝑀)(𝑂 Σg 𝑦))
46	43, 45	syl6eq 2872	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑂 Σg 𝑦)(+g‘𝑂)(𝑂 Σg ⟨“𝑧”⟩)) = (𝑧(+g‘𝑀)(𝑂 Σg 𝑦)))
47	40, 46	eqtrd 2856	. . . . . . 7 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑧(+g‘𝑀)(𝑂 Σg 𝑦)))
48		revccat 14128	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ Word 𝐵 ∧ ⟨“𝑧”⟩ ∈ Word 𝐵) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)))
49	33, 35, 48	syl2anc 586	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)))
50		revs1 14127	. . . . . . . . . . 11 ⊢ (reverse‘⟨“𝑧”⟩) = ⟨“𝑧”⟩
51	50	oveq1i 7166	. . . . . . . . . 10 ⊢ ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)) = (⟨“𝑧”⟩ ++ (reverse‘𝑦))
52	49, 51	syl6eq 2872	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = (⟨“𝑧”⟩ ++ (reverse‘𝑦)))
53	52	oveq2d 7172	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))) = (𝑀 Σg (⟨“𝑧”⟩ ++ (reverse‘𝑦))))
54		simpl 485	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑀 ∈ Mnd)
55		revcl 14123	. . . . . . . . . 10 ⊢ (𝑦 ∈ Word 𝐵 → (reverse‘𝑦) ∈ Word 𝐵)
56	55	ad2antrl 726	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘𝑦) ∈ Word 𝐵)
57	36, 44	gsumccat 18006	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ ⟨“𝑧”⟩ ∈ Word 𝐵 ∧ (reverse‘𝑦) ∈ Word 𝐵) → (𝑀 Σg (⟨“𝑧”⟩ ++ (reverse‘𝑦))) = ((𝑀 Σg ⟨“𝑧”⟩)(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))))
58	54, 35, 56, 57	syl3anc 1367	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg (⟨“𝑧”⟩ ++ (reverse‘𝑦))) = ((𝑀 Σg ⟨“𝑧”⟩)(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))))
59	36	gsumws1 18002	. . . . . . . . . 10 ⊢ (𝑧 ∈ 𝐵 → (𝑀 Σg ⟨“𝑧”⟩) = 𝑧)
60	59	ad2antll 727	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg ⟨“𝑧”⟩) = 𝑧)
61	60	oveq1d 7171	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑀 Σg ⟨“𝑧”⟩)(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))) = (𝑧(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))))
62	53, 58, 61	3eqtrd 2860	. . . . . . 7 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))) = (𝑧(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))))
63	47, 62	eqeq12d 2837	. . . . . 6 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))) ↔ (𝑧(+g‘𝑀)(𝑂 Σg 𝑦)) = (𝑧(+g‘𝑀)(𝑀 Σg (reverse‘𝑦)))))
64	30, 63	syl5ibr 248	. . . . 5 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦)) → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩)))))
65	64	expcom 416	. . . 4 ⊢ ((𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵) → (𝑀 ∈ Mnd → ((𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦)) → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))))))
66	65	a2d 29	. . 3 ⊢ ((𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵) → ((𝑀 ∈ Mnd → (𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦))) → (𝑀 ∈ Mnd → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))))))
67	7, 12, 17, 22, 29, 66	wrdind 14084	. 2 ⊢ (𝑊 ∈ Word 𝐵 → (𝑀 ∈ Mnd → (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊))))
68	67	impcom 410	1 ⊢ ((𝑀 ∈ Mnd ∧ 𝑊 ∈ Word 𝐵) → (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊)))

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1537   ∈ wcel 2114  ∅c0 4291  ‘cfv 6355  (class class class)co 7156  Word cword 13862   ++ cconcat 13922  ⟨“cs1 13949  reversecreverse 14120  Basecbs 16483  +_gcplusg 16565  0_gc0g 16713   Σ_g cgsu 16714  Mndcmnd 17911  opp_gcoppg 18473

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-rep 5190  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461  ax-cnex 10593  ax-resscn 10594  ax-1cn 10595  ax-icn 10596  ax-addcl 10597  ax-addrcl 10598  ax-mulcl 10599  ax-mulrcl 10600  ax-mulcom 10601  ax-addass 10602  ax-mulass 10603  ax-distr 10604  ax-i2m1 10605  ax-1ne0 10606  ax-1rid 10607  ax-rnegex 10608  ax-rrecex 10609  ax-cnre 10610  ax-pre-lttri 10611  ax-pre-lttrn 10612  ax-pre-ltadd 10613  ax-pre-mulgt0 10614

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-nel 3124  df-ral 3143  df-rex 3144  df-reu 3145  df-rmo 3146  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-tp 4572  df-op 4574  df-uni 4839  df-int 4877  df-iun 4921  df-br 5067  df-opab 5129  df-mpt 5147  df-tr 5173  df-id 5460  df-eprel 5465  df-po 5474  df-so 5475  df-fr 5514  df-we 5516  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-pred 6148  df-ord 6194  df-on 6195  df-lim 6196  df-suc 6197  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-riota 7114  df-ov 7159  df-oprab 7160  df-mpo 7161  df-om 7581  df-1st 7689  df-2nd 7690  df-tpos 7892  df-wrecs 7947  df-recs 8008  df-rdg 8046  df-1o 8102  df-oadd 8106  df-er 8289  df-en 8510  df-dom 8511  df-sdom 8512  df-fin 8513  df-card 9368  df-pnf 10677  df-mnf 10678  df-xr 10679  df-ltxr 10680  df-le 10681  df-sub 10872  df-neg 10873  df-nn 11639  df-2 11701  df-n0 11899  df-xnn0 11969  df-z 11983  df-uz 12245  df-fz 12894  df-fzo 13035  df-seq 13371  df-hash 13692  df-word 13863  df-lsw 13915  df-concat 13923  df-s1 13950  df-substr 14003  df-pfx 14033  df-reverse 14121  df-ndx 16486  df-slot 16487  df-base 16489  df-sets 16490  df-ress 16491  df-plusg 16578  df-0g 16715  df-gsum 16716  df-mgm 17852  df-sgrp 17901  df-mnd 17912  df-submnd 17957  df-oppg 18474

This theorem is referenced by:  symgtrinv  18600