Theorem gsumwrev 19408

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 7406	. . . . 5 ⊢ (𝑥 = ∅ → (𝑂 Σg 𝑥) = (𝑂 Σg ∅))
2		fveq2 6869	. . . . . . 7 ⊢ (𝑥 = ∅ → (reverse‘𝑥) = (reverse‘∅))
3		rev0 14779	. . . . . . 7 ⊢ (reverse‘∅) = ∅
4	2, 3	eqtrdi 2815	. . . . . 6 ⊢ (𝑥 = ∅ → (reverse‘𝑥) = ∅)
5	4	oveq2d 7414	. . . . 5 ⊢ (𝑥 = ∅ → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg ∅))
6	1, 5	eqeq12d 2780	. . . 4 ⊢ (𝑥 = ∅ → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg ∅) = (𝑀 Σg ∅)))
7	6	imbi2d 342	. . 3 ⊢ (𝑥 = ∅ → ((𝑀 ∈ Mnd → (𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥))) ↔ (𝑀 ∈ Mnd → (𝑂 Σg ∅) = (𝑀 Σg ∅))))
8		oveq2 7406	. . . . 5 ⊢ (𝑥 = 𝑦 → (𝑂 Σg 𝑥) = (𝑂 Σg 𝑦))
9		fveq2 6869	. . . . . 6 ⊢ (𝑥 = 𝑦 → (reverse‘𝑥) = (reverse‘𝑦))
10	9	oveq2d 7414	. . . . 5 ⊢ (𝑥 = 𝑦 → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘𝑦)))
11	8, 10	eqeq12d 2780	. . . 4 ⊢ (𝑥 = 𝑦 → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦))))
12	11	imbi2d 342	. . 3 ⊢ (𝑥 = 𝑦 → ((𝑀 ∈ Mnd → (𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥))) ↔ (𝑀 ∈ Mnd → (𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦)))))
13		oveq2 7406	. . . . 5 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (𝑂 Σg 𝑥) = (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)))
14		fveq2 6869	. . . . . 6 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (reverse‘𝑥) = (reverse‘(𝑦 ++ ⟨“𝑧”⟩)))
15	14	oveq2d 7414	. . . . 5 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))))
16	13, 15	eqeq12d 2780	. . . 4 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩)))))
17	16	imbi2d 342	. . 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 7406	. . . . 5 ⊢ (𝑥 = 𝑊 → (𝑂 Σg 𝑥) = (𝑂 Σg 𝑊))
19		fveq2 6869	. . . . . 6 ⊢ (𝑥 = 𝑊 → (reverse‘𝑥) = (reverse‘𝑊))
20	19	oveq2d 7414	. . . . 5 ⊢ (𝑥 = 𝑊 → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘𝑊)))
21	18, 20	eqeq12d 2780	. . . 4 ⊢ (𝑥 = 𝑊 → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊))))
22	21	imbi2d 342	. . 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 2764	. . . . . . 7 ⊢ (0g‘𝑀) = (0g‘𝑀)
25	23, 24	oppgid 19398	. . . . . 6 ⊢ (0g‘𝑀) = (0g‘𝑂)
26	25	gsum0 18720	. . . . 5 ⊢ (𝑂 Σg ∅) = (0g‘𝑀)
27	24	gsum0 18720	. . . . 5 ⊢ (𝑀 Σg ∅) = (0g‘𝑀)
28	26, 27	eqtr4i 2790	. . . 4 ⊢ (𝑂 Σg ∅) = (𝑀 Σg ∅)
29	28	a1i 11	. . 3 ⊢ (𝑀 ∈ Mnd → (𝑂 Σg ∅) = (𝑀 Σg ∅))
30		oveq2 7406	. . . . . 6 ⊢ ((𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦)) → (𝑧(+g‘𝑀)(𝑂 Σg 𝑦)) = (𝑧(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))))
31	23	oppgmnd 19396	. . . . . . . . . 10 ⊢ (𝑀 ∈ Mnd → 𝑂 ∈ Mnd)
32	31	adantr 484	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑂 ∈ Mnd)
33		simprl 780	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑦 ∈ Word 𝐵)
34		simprr 782	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑧 ∈ 𝐵)
35	34	s1cld 14619	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ⟨“𝑧”⟩ ∈ Word 𝐵)
36		gsumwrev.b	. . . . . . . . . . 11 ⊢ 𝐵 = (Base‘𝑀)
37	23, 36	oppgbas 19393	. . . . . . . . . 10 ⊢ 𝐵 = (Base‘𝑂)
38		eqid 2764	. . . . . . . . . 10 ⊢ (+g‘𝑂) = (+g‘𝑂)
39	37, 38	gsumccat 18877	. . . . . . . . 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 1392	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = ((𝑂 Σg 𝑦)(+g‘𝑂)(𝑂 Σg ⟨“𝑧”⟩)))
41	37	gsumws1 18874	. . . . . . . . . . 11 ⊢ (𝑧 ∈ 𝐵 → (𝑂 Σg ⟨“𝑧”⟩) = 𝑧)
42	41	ad2antll 739	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg ⟨“𝑧”⟩) = 𝑧)
43	42	oveq2d 7414	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑂 Σg 𝑦)(+g‘𝑂)(𝑂 Σg ⟨“𝑧”⟩)) = ((𝑂 Σg 𝑦)(+g‘𝑂)𝑧))
44		eqid 2764	. . . . . . . . . 10 ⊢ (+g‘𝑀) = (+g‘𝑀)
45	44, 23, 38	oppgplus 19391	. . . . . . . . 9 ⊢ ((𝑂 Σg 𝑦)(+g‘𝑂)𝑧) = (𝑧(+g‘𝑀)(𝑂 Σg 𝑦))
46	43, 45	eqtrdi 2815	. . . . . . . 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 2799	. . . . . . 7 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑧(+g‘𝑀)(𝑂 Σg 𝑦)))
48		revccat 14781	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ Word 𝐵 ∧ ⟨“𝑧”⟩ ∈ Word 𝐵) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)))
49	33, 35, 48	syl2anc 593	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)))
50		revs1 14780	. . . . . . . . . . 11 ⊢ (reverse‘⟨“𝑧”⟩) = ⟨“𝑧”⟩
51	50	oveq1i 7408	. . . . . . . . . 10 ⊢ ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)) = (⟨“𝑧”⟩ ++ (reverse‘𝑦))
52	49, 51	eqtrdi 2815	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = (⟨“𝑧”⟩ ++ (reverse‘𝑦)))
53	52	oveq2d 7414	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))) = (𝑀 Σg (⟨“𝑧”⟩ ++ (reverse‘𝑦))))
54		simpl 486	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑀 ∈ Mnd)
55		revcl 14776	. . . . . . . . . 10 ⊢ (𝑦 ∈ Word 𝐵 → (reverse‘𝑦) ∈ Word 𝐵)
56	55	ad2antrl 738	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘𝑦) ∈ Word 𝐵)
57	36, 44	gsumccat 18877	. . . . . . . . 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 1392	. . . . . . . 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 18874	. . . . . . . . . 10 ⊢ (𝑧 ∈ 𝐵 → (𝑀 Σg ⟨“𝑧”⟩) = 𝑧)
60	59	ad2antll 739	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg ⟨“𝑧”⟩) = 𝑧)
61	60	oveq1d 7413	. . . . . . . 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 2803	. . . . . . 7 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))) = (𝑧(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))))
63	47, 62	eqeq12d 2780	. . . . . 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 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 417	. . . 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 14737	. 2 ⊢ (𝑊 ∈ Word 𝐵 → (𝑀 ∈ Mnd → (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊))))
68	67	impcom 411	1 ⊢ ((𝑀 ∈ Mnd ∧ 𝑊 ∈ Word 𝐵) → (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊)))

Syntax hints:   → wi 4   ∧ wa 399   = wceq 1562   ∈ wcel 2144  ∅c0 4287  ‘cfv 6523  (class class class)co 7398  Word cword 14528   ++ cconcat 14585  ⟨“cs1 14611  reversecreverse 14773  Basecbs 17247  +_gcplusg 17288  0_gc0g 17470   Σ_g cgsu 17471  Mndcmnd 18770  opp_gcoppg 19387

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1817  ax-4 1831  ax-5 1932  ax-6 1989  ax-7 2030  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2214  ax-ext 2736  ax-rep 5229  ax-sep 5248  ax-nul 5258  ax-pow 5324  ax-pr 5392  ax-un 7720  ax-cnex 11131  ax-resscn 11132  ax-1cn 11133  ax-icn 11134  ax-addcl 11135  ax-addrcl 11136  ax-mulcl 11137  ax-mulrcl 11138  ax-mulcom 11139  ax-addass 11140  ax-mulass 11141  ax-distr 11142  ax-i2m1 11143  ax-1ne0 11144  ax-1rid 11145  ax-rnegex 11146  ax-rrecex 11147  ax-cnre 11148  ax-pre-lttri 11149  ax-pre-lttrn 11150  ax-pre-ltadd 11151  ax-pre-mulgt0 11152

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3or 1100  df-3an 1101  df-tru 1565  df-fal 1575  df-ex 1802  df-nf 1806  df-sb 2093  df-mo 2568  df-eu 2598  df-clab 2743  df-cleq 2756  df-clel 2839  df-nfc 2913  df-ne 2960  df-nel 3064  df-ral 3079  df-rex 3089  df-rmo 3369  df-reu 3370  df-rab 3417  df-v 3458  df-sbc 3747  df-csb 3855  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-pss 3926  df-nul 4288  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-int 4908  df-iun 4953  df-br 5103  df-opab 5165  df-mpt 5184  df-tr 5210  df-id 5544  df-eprel 5549  df-po 5557  df-so 5558  df-fr 5602  df-we 5604  df-xp 5655  df-rel 5656  df-cnv 5657  df-co 5658  df-dm 5659  df-rn 5660  df-res 5661  df-ima 5662  df-pred 6290  df-ord 6351  df-on 6352  df-lim 6353  df-suc 6354  df-iota 6479  df-fun 6525  df-fn 6526  df-f 6527  df-f1 6528  df-fo 6529  df-f1o 6530  df-fv 6531  df-riota 7355  df-ov 7401  df-oprab 7402  df-mpo 7403  df-om 7849  df-1st 7972  df-2nd 7973  df-tpos 8208  df-frecs 8264  df-wrecs 8295  df-recs 8344  df-rdg 8383  df-1o 8439  df-er 8680  df-en 8930  df-dom 8931  df-sdom 8932  df-fin 8933  df-card 9899  df-pnf 11220  df-mnf 11221  df-xr 11222  df-ltxr 11223  df-le 11224  df-sub 11418  df-neg 11419  df-nn 12213  df-2 12282  df-n0 12484  df-xnn0 12557  df-z 12571  df-uz 12842  df-fz 13515  df-fzo 13662  df-seq 14017  df-hash 14346  df-word 14529  df-lsw 14578  df-concat 14586  df-s1 14612  df-substr 14657  df-pfx 14687  df-reverse 14774  df-sets 17202  df-slot 17220  df-ndx 17232  df-base 17248  df-ress 17269  df-plusg 17301  df-0g 17472  df-gsum 17473  df-mgm 18676  df-sgrp 18755  df-mnd 18771  df-submnd 18820  df-oppg 19388

This theorem is referenced by:  symgtrinv  19514