Theorem gsumwrev 19245

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 7357	. . . . 5 ⊢ (𝑥 = ∅ → (𝑂 Σg 𝑥) = (𝑂 Σg ∅))
2		fveq2 6822	. . . . . . 7 ⊢ (𝑥 = ∅ → (reverse‘𝑥) = (reverse‘∅))
3		rev0 14670	. . . . . . 7 ⊢ (reverse‘∅) = ∅
4	2, 3	eqtrdi 2780	. . . . . 6 ⊢ (𝑥 = ∅ → (reverse‘𝑥) = ∅)
5	4	oveq2d 7365	. . . . 5 ⊢ (𝑥 = ∅ → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg ∅))
6	1, 5	eqeq12d 2745	. . . 4 ⊢ (𝑥 = ∅ → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg ∅) = (𝑀 Σg ∅)))
7	6	imbi2d 340	. . 3 ⊢ (𝑥 = ∅ → ((𝑀 ∈ Mnd → (𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥))) ↔ (𝑀 ∈ Mnd → (𝑂 Σg ∅) = (𝑀 Σg ∅))))
8		oveq2 7357	. . . . 5 ⊢ (𝑥 = 𝑦 → (𝑂 Σg 𝑥) = (𝑂 Σg 𝑦))
9		fveq2 6822	. . . . . 6 ⊢ (𝑥 = 𝑦 → (reverse‘𝑥) = (reverse‘𝑦))
10	9	oveq2d 7365	. . . . 5 ⊢ (𝑥 = 𝑦 → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘𝑦)))
11	8, 10	eqeq12d 2745	. . . 4 ⊢ (𝑥 = 𝑦 → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦))))
12	11	imbi2d 340	. . 3 ⊢ (𝑥 = 𝑦 → ((𝑀 ∈ Mnd → (𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥))) ↔ (𝑀 ∈ Mnd → (𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦)))))
13		oveq2 7357	. . . . 5 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (𝑂 Σg 𝑥) = (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)))
14		fveq2 6822	. . . . . 6 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (reverse‘𝑥) = (reverse‘(𝑦 ++ ⟨“𝑧”⟩)))
15	14	oveq2d 7365	. . . . 5 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))))
16	13, 15	eqeq12d 2745	. . . 4 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩)))))
17	16	imbi2d 340	. . 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 7357	. . . . 5 ⊢ (𝑥 = 𝑊 → (𝑂 Σg 𝑥) = (𝑂 Σg 𝑊))
19		fveq2 6822	. . . . . 6 ⊢ (𝑥 = 𝑊 → (reverse‘𝑥) = (reverse‘𝑊))
20	19	oveq2d 7365	. . . . 5 ⊢ (𝑥 = 𝑊 → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘𝑊)))
21	18, 20	eqeq12d 2745	. . . 4 ⊢ (𝑥 = 𝑊 → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊))))
22	21	imbi2d 340	. . 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 2729	. . . . . . 7 ⊢ (0g‘𝑀) = (0g‘𝑀)
25	23, 24	oppgid 19235	. . . . . 6 ⊢ (0g‘𝑀) = (0g‘𝑂)
26	25	gsum0 18558	. . . . 5 ⊢ (𝑂 Σg ∅) = (0g‘𝑀)
27	24	gsum0 18558	. . . . 5 ⊢ (𝑀 Σg ∅) = (0g‘𝑀)
28	26, 27	eqtr4i 2755	. . . 4 ⊢ (𝑂 Σg ∅) = (𝑀 Σg ∅)
29	28	a1i 11	. . 3 ⊢ (𝑀 ∈ Mnd → (𝑂 Σg ∅) = (𝑀 Σg ∅))
30		oveq2 7357	. . . . . 6 ⊢ ((𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦)) → (𝑧(+g‘𝑀)(𝑂 Σg 𝑦)) = (𝑧(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))))
31	23	oppgmnd 19233	. . . . . . . . . 10 ⊢ (𝑀 ∈ Mnd → 𝑂 ∈ Mnd)
32	31	adantr 480	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑂 ∈ Mnd)
33		simprl 770	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑦 ∈ Word 𝐵)
34		simprr 772	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑧 ∈ 𝐵)
35	34	s1cld 14510	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ⟨“𝑧”⟩ ∈ Word 𝐵)
36		gsumwrev.b	. . . . . . . . . . 11 ⊢ 𝐵 = (Base‘𝑀)
37	23, 36	oppgbas 19230	. . . . . . . . . 10 ⊢ 𝐵 = (Base‘𝑂)
38		eqid 2729	. . . . . . . . . 10 ⊢ (+g‘𝑂) = (+g‘𝑂)
39	37, 38	gsumccat 18715	. . . . . . . . 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 1373	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = ((𝑂 Σg 𝑦)(+g‘𝑂)(𝑂 Σg ⟨“𝑧”⟩)))
41	37	gsumws1 18712	. . . . . . . . . . 11 ⊢ (𝑧 ∈ 𝐵 → (𝑂 Σg ⟨“𝑧”⟩) = 𝑧)
42	41	ad2antll 729	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg ⟨“𝑧”⟩) = 𝑧)
43	42	oveq2d 7365	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑂 Σg 𝑦)(+g‘𝑂)(𝑂 Σg ⟨“𝑧”⟩)) = ((𝑂 Σg 𝑦)(+g‘𝑂)𝑧))
44		eqid 2729	. . . . . . . . . 10 ⊢ (+g‘𝑀) = (+g‘𝑀)
45	44, 23, 38	oppgplus 19228	. . . . . . . . 9 ⊢ ((𝑂 Σg 𝑦)(+g‘𝑂)𝑧) = (𝑧(+g‘𝑀)(𝑂 Σg 𝑦))
46	43, 45	eqtrdi 2780	. . . . . . . 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 2764	. . . . . . 7 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑧(+g‘𝑀)(𝑂 Σg 𝑦)))
48		revccat 14672	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ Word 𝐵 ∧ ⟨“𝑧”⟩ ∈ Word 𝐵) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)))
49	33, 35, 48	syl2anc 584	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)))
50		revs1 14671	. . . . . . . . . . 11 ⊢ (reverse‘⟨“𝑧”⟩) = ⟨“𝑧”⟩
51	50	oveq1i 7359	. . . . . . . . . 10 ⊢ ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)) = (⟨“𝑧”⟩ ++ (reverse‘𝑦))
52	49, 51	eqtrdi 2780	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = (⟨“𝑧”⟩ ++ (reverse‘𝑦)))
53	52	oveq2d 7365	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))) = (𝑀 Σg (⟨“𝑧”⟩ ++ (reverse‘𝑦))))
54		simpl 482	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑀 ∈ Mnd)
55		revcl 14667	. . . . . . . . . 10 ⊢ (𝑦 ∈ Word 𝐵 → (reverse‘𝑦) ∈ Word 𝐵)
56	55	ad2antrl 728	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘𝑦) ∈ Word 𝐵)
57	36, 44	gsumccat 18715	. . . . . . . . 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 1373	. . . . . . . 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 18712	. . . . . . . . . 10 ⊢ (𝑧 ∈ 𝐵 → (𝑀 Σg ⟨“𝑧”⟩) = 𝑧)
60	59	ad2antll 729	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg ⟨“𝑧”⟩) = 𝑧)
61	60	oveq1d 7364	. . . . . . . 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 2768	. . . . . . 7 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))) = (𝑧(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))))
63	47, 62	eqeq12d 2745	. . . . . 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	imbitrrid 246	. . . . 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 413	. . . 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 14628	. 2 ⊢ (𝑊 ∈ Word 𝐵 → (𝑀 ∈ Mnd → (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊))))
68	67	impcom 407	1 ⊢ ((𝑀 ∈ Mnd ∧ 𝑊 ∈ Word 𝐵) → (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊)))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1540   ∈ wcel 2109  ∅c0 4284  ‘cfv 6482  (class class class)co 7349  Word cword 14420   ++ cconcat 14477  ⟨“cs1 14502  reversecreverse 14664  Basecbs 17120  +_gcplusg 17161  0_gc0g 17343   Σ_g cgsu 17344  Mndcmnd 18608  opp_gcoppg 19224

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5218  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671  ax-cnex 11065  ax-resscn 11066  ax-1cn 11067  ax-icn 11068  ax-addcl 11069  ax-addrcl 11070  ax-mulcl 11071  ax-mulrcl 11072  ax-mulcom 11073  ax-addass 11074  ax-mulass 11075  ax-distr 11076  ax-i2m1 11077  ax-1ne0 11078  ax-1rid 11079  ax-rnegex 11080  ax-rrecex 11081  ax-cnre 11082  ax-pre-lttri 11083  ax-pre-lttrn 11084  ax-pre-ltadd 11085  ax-pre-mulgt0 11086

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-nel 3030  df-ral 3045  df-rex 3054  df-rmo 3343  df-reu 3344  df-rab 3395  df-v 3438  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-pss 3923  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-int 4897  df-iun 4943  df-br 5093  df-opab 5155  df-mpt 5174  df-tr 5200  df-id 5514  df-eprel 5519  df-po 5527  df-so 5528  df-fr 5572  df-we 5574  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-pred 6249  df-ord 6310  df-on 6311  df-lim 6312  df-suc 6313  df-iota 6438  df-fun 6484  df-fn 6485  df-f 6486  df-f1 6487  df-fo 6488  df-f1o 6489  df-fv 6490  df-riota 7306  df-ov 7352  df-oprab 7353  df-mpo 7354  df-om 7800  df-1st 7924  df-2nd 7925  df-tpos 8159  df-frecs 8214  df-wrecs 8245  df-recs 8294  df-rdg 8332  df-1o 8388  df-er 8625  df-en 8873  df-dom 8874  df-sdom 8875  df-fin 8876  df-card 9835  df-pnf 11151  df-mnf 11152  df-xr 11153  df-ltxr 11154  df-le 11155  df-sub 11349  df-neg 11350  df-nn 12129  df-2 12191  df-n0 12385  df-xnn0 12458  df-z 12472  df-uz 12736  df-fz 13411  df-fzo 13558  df-seq 13909  df-hash 14238  df-word 14421  df-lsw 14470  df-concat 14478  df-s1 14503  df-substr 14548  df-pfx 14578  df-reverse 14665  df-sets 17075  df-slot 17093  df-ndx 17105  df-base 17121  df-ress 17142  df-plusg 17174  df-0g 17345  df-gsum 17346  df-mgm 18514  df-sgrp 18593  df-mnd 18609  df-submnd 18658  df-oppg 19225

This theorem is referenced by:  symgtrinv  19351