Theorem gsumwrev 17796

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 6658	. . . . 5 ⊢ (𝑥 = ∅ → (𝑂 Σg 𝑥) = (𝑂 Σg ∅))
2		fveq2 6191	. . . . . . 7 ⊢ (𝑥 = ∅ → (reverse‘𝑥) = (reverse‘∅))
3		rev0 13513	. . . . . . 7 ⊢ (reverse‘∅) = ∅
4	2, 3	syl6eq 2672	. . . . . 6 ⊢ (𝑥 = ∅ → (reverse‘𝑥) = ∅)
5	4	oveq2d 6666	. . . . 5 ⊢ (𝑥 = ∅ → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg ∅))
6	1, 5	eqeq12d 2637	. . . 4 ⊢ (𝑥 = ∅ → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg ∅) = (𝑀 Σg ∅)))
7	6	imbi2d 330	. . 3 ⊢ (𝑥 = ∅ → ((𝑀 ∈ Mnd → (𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥))) ↔ (𝑀 ∈ Mnd → (𝑂 Σg ∅) = (𝑀 Σg ∅))))
8		oveq2 6658	. . . . 5 ⊢ (𝑥 = 𝑦 → (𝑂 Σg 𝑥) = (𝑂 Σg 𝑦))
9		fveq2 6191	. . . . . 6 ⊢ (𝑥 = 𝑦 → (reverse‘𝑥) = (reverse‘𝑦))
10	9	oveq2d 6666	. . . . 5 ⊢ (𝑥 = 𝑦 → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘𝑦)))
11	8, 10	eqeq12d 2637	. . . 4 ⊢ (𝑥 = 𝑦 → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦))))
12	11	imbi2d 330	. . 3 ⊢ (𝑥 = 𝑦 → ((𝑀 ∈ Mnd → (𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥))) ↔ (𝑀 ∈ Mnd → (𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦)))))
13		oveq2 6658	. . . . 5 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (𝑂 Σg 𝑥) = (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)))
14		fveq2 6191	. . . . . 6 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (reverse‘𝑥) = (reverse‘(𝑦 ++ ⟨“𝑧”⟩)))
15	14	oveq2d 6666	. . . . 5 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))))
16	13, 15	eqeq12d 2637	. . . 4 ⊢ (𝑥 = (𝑦 ++ ⟨“𝑧”⟩) → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩)))))
17	16	imbi2d 330	. . 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 6658	. . . . 5 ⊢ (𝑥 = 𝑊 → (𝑂 Σg 𝑥) = (𝑂 Σg 𝑊))
19		fveq2 6191	. . . . . 6 ⊢ (𝑥 = 𝑊 → (reverse‘𝑥) = (reverse‘𝑊))
20	19	oveq2d 6666	. . . . 5 ⊢ (𝑥 = 𝑊 → (𝑀 Σg (reverse‘𝑥)) = (𝑀 Σg (reverse‘𝑊)))
21	18, 20	eqeq12d 2637	. . . 4 ⊢ (𝑥 = 𝑊 → ((𝑂 Σg 𝑥) = (𝑀 Σg (reverse‘𝑥)) ↔ (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊))))
22	21	imbi2d 330	. . 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 2622	. . . . . . 7 ⊢ (0g‘𝑀) = (0g‘𝑀)
25	23, 24	oppgid 17786	. . . . . 6 ⊢ (0g‘𝑀) = (0g‘𝑂)
26	25	gsum0 17278	. . . . 5 ⊢ (𝑂 Σg ∅) = (0g‘𝑀)
27	24	gsum0 17278	. . . . 5 ⊢ (𝑀 Σg ∅) = (0g‘𝑀)
28	26, 27	eqtr4i 2647	. . . 4 ⊢ (𝑂 Σg ∅) = (𝑀 Σg ∅)
29	28	a1i 11	. . 3 ⊢ (𝑀 ∈ Mnd → (𝑂 Σg ∅) = (𝑀 Σg ∅))
30		oveq2 6658	. . . . . 6 ⊢ ((𝑂 Σg 𝑦) = (𝑀 Σg (reverse‘𝑦)) → (𝑧(+g‘𝑀)(𝑂 Σg 𝑦)) = (𝑧(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))))
31	23	oppgmnd 17784	. . . . . . . . . 10 ⊢ (𝑀 ∈ Mnd → 𝑂 ∈ Mnd)
32	31	adantr 481	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑂 ∈ Mnd)
33		simprl 794	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑦 ∈ Word 𝐵)
34		simprr 796	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑧 ∈ 𝐵)
35	34	s1cld 13383	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ⟨“𝑧”⟩ ∈ Word 𝐵)
36		gsumwrev.b	. . . . . . . . . . 11 ⊢ 𝐵 = (Base‘𝑀)
37	23, 36	oppgbas 17781	. . . . . . . . . 10 ⊢ 𝐵 = (Base‘𝑂)
38		eqid 2622	. . . . . . . . . 10 ⊢ (+g‘𝑂) = (+g‘𝑂)
39	37, 38	gsumccat 17378	. . . . . . . . 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 1326	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = ((𝑂 Σg 𝑦)(+g‘𝑂)(𝑂 Σg ⟨“𝑧”⟩)))
41	37	gsumws1 17376	. . . . . . . . . . 11 ⊢ (𝑧 ∈ 𝐵 → (𝑂 Σg ⟨“𝑧”⟩) = 𝑧)
42	41	ad2antll 765	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg ⟨“𝑧”⟩) = 𝑧)
43	42	oveq2d 6666	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑂 Σg 𝑦)(+g‘𝑂)(𝑂 Σg ⟨“𝑧”⟩)) = ((𝑂 Σg 𝑦)(+g‘𝑂)𝑧))
44		eqid 2622	. . . . . . . . . 10 ⊢ (+g‘𝑀) = (+g‘𝑀)
45	44, 23, 38	oppgplus 17779	. . . . . . . . 9 ⊢ ((𝑂 Σg 𝑦)(+g‘𝑂)𝑧) = (𝑧(+g‘𝑀)(𝑂 Σg 𝑦))
46	43, 45	syl6eq 2672	. . . . . . . 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 2656	. . . . . . 7 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑂 Σg (𝑦 ++ ⟨“𝑧”⟩)) = (𝑧(+g‘𝑀)(𝑂 Σg 𝑦)))
48		revccat 13515	. . . . . . . . . . 11 ⊢ ((𝑦 ∈ Word 𝐵 ∧ ⟨“𝑧”⟩ ∈ Word 𝐵) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)))
49	33, 35, 48	syl2anc 693	. . . . . . . . . 10 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)))
50		revs1 13514	. . . . . . . . . . 11 ⊢ (reverse‘⟨“𝑧”⟩) = ⟨“𝑧”⟩
51	50	oveq1i 6660	. . . . . . . . . 10 ⊢ ((reverse‘⟨“𝑧”⟩) ++ (reverse‘𝑦)) = (⟨“𝑧”⟩ ++ (reverse‘𝑦))
52	49, 51	syl6eq 2672	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘(𝑦 ++ ⟨“𝑧”⟩)) = (⟨“𝑧”⟩ ++ (reverse‘𝑦)))
53	52	oveq2d 6666	. . . . . . . 8 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))) = (𝑀 Σg (⟨“𝑧”⟩ ++ (reverse‘𝑦))))
54		simpl 473	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → 𝑀 ∈ Mnd)
55		revcl 13510	. . . . . . . . . 10 ⊢ (𝑦 ∈ Word 𝐵 → (reverse‘𝑦) ∈ Word 𝐵)
56	55	ad2antrl 764	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (reverse‘𝑦) ∈ Word 𝐵)
57	36, 44	gsumccat 17378	. . . . . . . . 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 1326	. . . . . . . 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 17376	. . . . . . . . . 10 ⊢ (𝑧 ∈ 𝐵 → (𝑀 Σg ⟨“𝑧”⟩) = 𝑧)
60	59	ad2antll 765	. . . . . . . . 9 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg ⟨“𝑧”⟩) = 𝑧)
61	60	oveq1d 6665	. . . . . . . 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 2660	. . . . . . 7 ⊢ ((𝑀 ∈ Mnd ∧ (𝑦 ∈ Word 𝐵 ∧ 𝑧 ∈ 𝐵)) → (𝑀 Σg (reverse‘(𝑦 ++ ⟨“𝑧”⟩))) = (𝑧(+g‘𝑀)(𝑀 Σg (reverse‘𝑦))))
63	47, 62	eqeq12d 2637	. . . . . 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 236	. . . . 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 451	. . . 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 13476	. 2 ⊢ (𝑊 ∈ Word 𝐵 → (𝑀 ∈ Mnd → (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊))))
68	67	impcom 446	1 ⊢ ((𝑀 ∈ Mnd ∧ 𝑊 ∈ Word 𝐵) → (𝑂 Σg 𝑊) = (𝑀 Σg (reverse‘𝑊)))

Syntax hints:   → wi 4   ∧ wa 384   = wceq 1483   ∈ wcel 1990  ∅c0 3915  ‘cfv 5888  (class class class)co 6650  Word cword 13291   ++ cconcat 13293  ⟨“cs1 13294  reversecreverse 13297  Basecbs 15857  +_gcplusg 15941  0_gc0g 16100   Σ_g cgsu 16101  Mndcmnd 17294  opp_gcoppg 17775

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-tpos 7352  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-card 8765  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-2 11079  df-n0 11293  df-xnn0 11364  df-z 11378  df-uz 11688  df-fz 12327  df-fzo 12466  df-seq 12802  df-hash 13118  df-word 13299  df-lsw 13300  df-concat 13301  df-s1 13302  df-substr 13303  df-reverse 13305  df-ndx 15860  df-slot 15861  df-base 15863  df-sets 15864  df-ress 15865  df-plusg 15954  df-0g 16102  df-gsum 16103  df-mgm 17242  df-sgrp 17284  df-mnd 17295  df-submnd 17336  df-oppg 17776

This theorem is referenced by:  symgtrinv  17892