Theorem smumullem 16516

Description: Lemma for smumul 16517. (Contributed by Mario Carneiro, 22-Sep-2016.)

Hypotheses

Ref	Expression
smumullem.a	⊢ (𝜑 → 𝐴 ∈ ℤ)
smumullem.b	⊢ (𝜑 → 𝐵 ∈ ℤ)
smumullem.n	⊢ (𝜑 → 𝑁 ∈ ℕ0)

Assertion

Ref	Expression
smumullem	⊢ (𝜑 → (((bits‘𝐴) ∩ (0..^𝑁)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑁)) · 𝐵)))

Proof of Theorem smumullem

Dummy variables 𝑘 𝑛 𝑥 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		smumullem.n	. 2 ⊢ (𝜑 → 𝑁 ∈ ℕ0)
2		oveq2 7398	. . . . . . . . . 10 ⊢ (𝑥 = 0 → (0..^𝑥) = (0..^0))
3		fzo0 13682	. . . . . . . . . 10 ⊢ (0..^0) = ∅
4	2, 3	eqtrdi 2812	. . . . . . . . 9 ⊢ (𝑥 = 0 → (0..^𝑥) = ∅)
5	4	ineq2d 4170	. . . . . . . 8 ⊢ (𝑥 = 0 → ((bits‘𝐴) ∩ (0..^𝑥)) = ((bits‘𝐴) ∩ ∅))
6		in0 4346	. . . . . . . 8 ⊢ ((bits‘𝐴) ∩ ∅) = ∅
7	5, 6	eqtrdi 2812	. . . . . . 7 ⊢ (𝑥 = 0 → ((bits‘𝐴) ∩ (0..^𝑥)) = ∅)
8	7	oveq1d 7405	. . . . . 6 ⊢ (𝑥 = 0 → (((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (∅ smul (bits‘𝐵)))
9		bitsss 16450	. . . . . . 7 ⊢ (bits‘𝐵) ⊆ ℕ0
10		smu02 16511	. . . . . . 7 ⊢ ((bits‘𝐵) ⊆ ℕ0 → (∅ smul (bits‘𝐵)) = ∅)
11	9, 10	ax-mp 5	. . . . . 6 ⊢ (∅ smul (bits‘𝐵)) = ∅
12	8, 11	eqtrdi 2812	. . . . 5 ⊢ (𝑥 = 0 → (((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = ∅)
13		oveq2 7398	. . . . . . . 8 ⊢ (𝑥 = 0 → (2↑𝑥) = (2↑0))
14		2cn 12286	. . . . . . . . 9 ⊢ 2 ∈ ℂ
15		exp0 14071	. . . . . . . . 9 ⊢ (2 ∈ ℂ → (2↑0) = 1)
16	14, 15	ax-mp 5	. . . . . . . 8 ⊢ (2↑0) = 1
17	13, 16	eqtrdi 2812	. . . . . . 7 ⊢ (𝑥 = 0 → (2↑𝑥) = 1)
18	17	oveq2d 7406	. . . . . 6 ⊢ (𝑥 = 0 → (𝐴 mod (2↑𝑥)) = (𝐴 mod 1))
19	18	fvoveq1d 7412	. . . . 5 ⊢ (𝑥 = 0 → (bits‘((𝐴 mod (2↑𝑥)) · 𝐵)) = (bits‘((𝐴 mod 1) · 𝐵)))
20	12, 19	eqeq12d 2777	. . . 4 ⊢ (𝑥 = 0 → ((((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑥)) · 𝐵)) ↔ ∅ = (bits‘((𝐴 mod 1) · 𝐵))))
21	20	imbi2d 342	. . 3 ⊢ (𝑥 = 0 → ((𝜑 → (((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑥)) · 𝐵))) ↔ (𝜑 → ∅ = (bits‘((𝐴 mod 1) · 𝐵)))))
22		oveq2 7398	. . . . . . 7 ⊢ (𝑥 = 𝑘 → (0..^𝑥) = (0..^𝑘))
23	22	ineq2d 4170	. . . . . 6 ⊢ (𝑥 = 𝑘 → ((bits‘𝐴) ∩ (0..^𝑥)) = ((bits‘𝐴) ∩ (0..^𝑘)))
24	23	oveq1d 7405	. . . . 5 ⊢ (𝑥 = 𝑘 → (((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (((bits‘𝐴) ∩ (0..^𝑘)) smul (bits‘𝐵)))
25		oveq2 7398	. . . . . . 7 ⊢ (𝑥 = 𝑘 → (2↑𝑥) = (2↑𝑘))
26	25	oveq2d 7406	. . . . . 6 ⊢ (𝑥 = 𝑘 → (𝐴 mod (2↑𝑥)) = (𝐴 mod (2↑𝑘)))
27	26	fvoveq1d 7412	. . . . 5 ⊢ (𝑥 = 𝑘 → (bits‘((𝐴 mod (2↑𝑥)) · 𝐵)) = (bits‘((𝐴 mod (2↑𝑘)) · 𝐵)))
28	24, 27	eqeq12d 2777	. . . 4 ⊢ (𝑥 = 𝑘 → ((((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑥)) · 𝐵)) ↔ (((bits‘𝐴) ∩ (0..^𝑘)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑘)) · 𝐵))))
29	28	imbi2d 342	. . 3 ⊢ (𝑥 = 𝑘 → ((𝜑 → (((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑥)) · 𝐵))) ↔ (𝜑 → (((bits‘𝐴) ∩ (0..^𝑘)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑘)) · 𝐵)))))
30		oveq2 7398	. . . . . . 7 ⊢ (𝑥 = (𝑘 + 1) → (0..^𝑥) = (0..^(𝑘 + 1)))
31	30	ineq2d 4170	. . . . . 6 ⊢ (𝑥 = (𝑘 + 1) → ((bits‘𝐴) ∩ (0..^𝑥)) = ((bits‘𝐴) ∩ (0..^(𝑘 + 1))))
32	31	oveq1d 7405	. . . . 5 ⊢ (𝑥 = (𝑘 + 1) → (((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (((bits‘𝐴) ∩ (0..^(𝑘 + 1))) smul (bits‘𝐵)))
33		oveq2 7398	. . . . . . 7 ⊢ (𝑥 = (𝑘 + 1) → (2↑𝑥) = (2↑(𝑘 + 1)))
34	33	oveq2d 7406	. . . . . 6 ⊢ (𝑥 = (𝑘 + 1) → (𝐴 mod (2↑𝑥)) = (𝐴 mod (2↑(𝑘 + 1))))
35	34	fvoveq1d 7412	. . . . 5 ⊢ (𝑥 = (𝑘 + 1) → (bits‘((𝐴 mod (2↑𝑥)) · 𝐵)) = (bits‘((𝐴 mod (2↑(𝑘 + 1))) · 𝐵)))
36	32, 35	eqeq12d 2777	. . . 4 ⊢ (𝑥 = (𝑘 + 1) → ((((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑥)) · 𝐵)) ↔ (((bits‘𝐴) ∩ (0..^(𝑘 + 1))) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑(𝑘 + 1))) · 𝐵))))
37	36	imbi2d 342	. . 3 ⊢ (𝑥 = (𝑘 + 1) → ((𝜑 → (((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑥)) · 𝐵))) ↔ (𝜑 → (((bits‘𝐴) ∩ (0..^(𝑘 + 1))) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑(𝑘 + 1))) · 𝐵)))))
38		oveq2 7398	. . . . . . 7 ⊢ (𝑥 = 𝑁 → (0..^𝑥) = (0..^𝑁))
39	38	ineq2d 4170	. . . . . 6 ⊢ (𝑥 = 𝑁 → ((bits‘𝐴) ∩ (0..^𝑥)) = ((bits‘𝐴) ∩ (0..^𝑁)))
40	39	oveq1d 7405	. . . . 5 ⊢ (𝑥 = 𝑁 → (((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (((bits‘𝐴) ∩ (0..^𝑁)) smul (bits‘𝐵)))
41		oveq2 7398	. . . . . . 7 ⊢ (𝑥 = 𝑁 → (2↑𝑥) = (2↑𝑁))
42	41	oveq2d 7406	. . . . . 6 ⊢ (𝑥 = 𝑁 → (𝐴 mod (2↑𝑥)) = (𝐴 mod (2↑𝑁)))
43	42	fvoveq1d 7412	. . . . 5 ⊢ (𝑥 = 𝑁 → (bits‘((𝐴 mod (2↑𝑥)) · 𝐵)) = (bits‘((𝐴 mod (2↑𝑁)) · 𝐵)))
44	40, 43	eqeq12d 2777	. . . 4 ⊢ (𝑥 = 𝑁 → ((((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑥)) · 𝐵)) ↔ (((bits‘𝐴) ∩ (0..^𝑁)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑁)) · 𝐵))))
45	44	imbi2d 342	. . 3 ⊢ (𝑥 = 𝑁 → ((𝜑 → (((bits‘𝐴) ∩ (0..^𝑥)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑥)) · 𝐵))) ↔ (𝜑 → (((bits‘𝐴) ∩ (0..^𝑁)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑁)) · 𝐵)))))
46		smumullem.a	. . . . . . . 8 ⊢ (𝜑 → 𝐴 ∈ ℤ)
47		zmod10 13890	. . . . . . . 8 ⊢ (𝐴 ∈ ℤ → (𝐴 mod 1) = 0)
48	46, 47	syl 17	. . . . . . 7 ⊢ (𝜑 → (𝐴 mod 1) = 0)
49	48	oveq1d 7405	. . . . . 6 ⊢ (𝜑 → ((𝐴 mod 1) · 𝐵) = (0 · 𝐵))
50		smumullem.b	. . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ ℤ)
51	50	zcnd 12671	. . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℂ)
52	51	mul02d 11374	. . . . . 6 ⊢ (𝜑 → (0 · 𝐵) = 0)
53	49, 52	eqtrd 2796	. . . . 5 ⊢ (𝜑 → ((𝐴 mod 1) · 𝐵) = 0)
54	53	fveq2d 6865	. . . 4 ⊢ (𝜑 → (bits‘((𝐴 mod 1) · 𝐵)) = (bits‘0))
55		0bits 16463	. . . 4 ⊢ (bits‘0) = ∅
56	54, 55	eqtr2di 2813	. . 3 ⊢ (𝜑 → ∅ = (bits‘((𝐴 mod 1) · 𝐵)))
57		oveq1 7397	. . . . . 6 ⊢ ((((bits‘𝐴) ∩ (0..^𝑘)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑘)) · 𝐵)) → ((((bits‘𝐴) ∩ (0..^𝑘)) smul (bits‘𝐵)) sadd {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))}) = ((bits‘((𝐴 mod (2↑𝑘)) · 𝐵)) sadd {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))}))
58		bitsss 16450	. . . . . . . . 9 ⊢ (bits‘𝐴) ⊆ ℕ0
59	58	a1i 11	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (bits‘𝐴) ⊆ ℕ0)
60	9	a1i 11	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (bits‘𝐵) ⊆ ℕ0)
61		simpr 488	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 𝑘 ∈ ℕ0)
62	59, 60, 61	smup1 16513	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (((bits‘𝐴) ∩ (0..^(𝑘 + 1))) smul (bits‘𝐵)) = ((((bits‘𝐴) ∩ (0..^𝑘)) smul (bits‘𝐵)) sadd {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))}))
63		bitsinv1lem 16465	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℤ ∧ 𝑘 ∈ ℕ0) → (𝐴 mod (2↑(𝑘 + 1))) = ((𝐴 mod (2↑𝑘)) + if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)))
64	46, 63	sylan 589	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (𝐴 mod (2↑(𝑘 + 1))) = ((𝐴 mod (2↑𝑘)) + if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)))
65	64	oveq1d 7405	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → ((𝐴 mod (2↑(𝑘 + 1))) · 𝐵) = (((𝐴 mod (2↑𝑘)) + if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)) · 𝐵))
66	46	adantr 484	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 𝐴 ∈ ℤ)
67		2nn 12284	. . . . . . . . . . . . . . 15 ⊢ 2 ∈ ℕ
68	67	a1i 11	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 2 ∈ ℕ)
69	68, 61	nnexpcld 14251	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (2↑𝑘) ∈ ℕ)
70	66, 69	zmodcld 13895	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (𝐴 mod (2↑𝑘)) ∈ ℕ0)
71	70	nn0cnd 12537	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (𝐴 mod (2↑𝑘)) ∈ ℂ)
72	69	nnnn0d 12535	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (2↑𝑘) ∈ ℕ0)
73		0nn0 12489	. . . . . . . . . . . . 13 ⊢ 0 ∈ ℕ0
74		ifcl 4523	. . . . . . . . . . . . 13 ⊢ (((2↑𝑘) ∈ ℕ0 ∧ 0 ∈ ℕ0) → if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0) ∈ ℕ0)
75	72, 73, 74	sylancl 595	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0) ∈ ℕ0)
76	75	nn0cnd 12537	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0) ∈ ℂ)
77	51	adantr 484	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 𝐵 ∈ ℂ)
78	71, 76, 77	adddird 11200	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (((𝐴 mod (2↑𝑘)) + if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)) · 𝐵) = (((𝐴 mod (2↑𝑘)) · 𝐵) + (if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0) · 𝐵)))
79	76, 77	mulcomd 11196	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0) · 𝐵) = (𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)))
80	79	oveq2d 7406	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (((𝐴 mod (2↑𝑘)) · 𝐵) + (if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0) · 𝐵)) = (((𝐴 mod (2↑𝑘)) · 𝐵) + (𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0))))
81	65, 78, 80	3eqtrd 2800	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → ((𝐴 mod (2↑(𝑘 + 1))) · 𝐵) = (((𝐴 mod (2↑𝑘)) · 𝐵) + (𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0))))
82	81	fveq2d 6865	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (bits‘((𝐴 mod (2↑(𝑘 + 1))) · 𝐵)) = (bits‘(((𝐴 mod (2↑𝑘)) · 𝐵) + (𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)))))
83	70	nn0zd 12586	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (𝐴 mod (2↑𝑘)) ∈ ℤ)
84	50	adantr 484	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → 𝐵 ∈ ℤ)
85	83, 84	zmulcld 12676	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → ((𝐴 mod (2↑𝑘)) · 𝐵) ∈ ℤ)
86	75	nn0zd 12586	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0) ∈ ℤ)
87	84, 86	zmulcld 12676	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)) ∈ ℤ)
88		sadadd 16491	. . . . . . . . 9 ⊢ ((((𝐴 mod (2↑𝑘)) · 𝐵) ∈ ℤ ∧ (𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)) ∈ ℤ) → ((bits‘((𝐴 mod (2↑𝑘)) · 𝐵)) sadd (bits‘(𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)))) = (bits‘(((𝐴 mod (2↑𝑘)) · 𝐵) + (𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)))))
89	85, 87, 88	syl2anc 593	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → ((bits‘((𝐴 mod (2↑𝑘)) · 𝐵)) sadd (bits‘(𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)))) = (bits‘(((𝐴 mod (2↑𝑘)) · 𝐵) + (𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)))))
90		oveq2 7398	. . . . . . . . . . 11 ⊢ ((2↑𝑘) = if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0) → (𝐵 · (2↑𝑘)) = (𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)))
91	90	fveqeq2d 6869	. . . . . . . . . 10 ⊢ ((2↑𝑘) = if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0) → ((bits‘(𝐵 · (2↑𝑘))) = {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))} ↔ (bits‘(𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0))) = {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))}))
92		oveq2 7398	. . . . . . . . . . 11 ⊢ (0 = if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0) → (𝐵 · 0) = (𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)))
93	92	fveqeq2d 6869	. . . . . . . . . 10 ⊢ (0 = if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0) → ((bits‘(𝐵 · 0)) = {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))} ↔ (bits‘(𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0))) = {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))}))
94		bitsshft 16499	. . . . . . . . . . . 12 ⊢ ((𝐵 ∈ ℤ ∧ 𝑘 ∈ ℕ0) → {𝑛 ∈ ℕ0 ∣ (𝑛 − 𝑘) ∈ (bits‘𝐵)} = (bits‘(𝐵 · (2↑𝑘))))
95	50, 94	sylan 589	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → {𝑛 ∈ ℕ0 ∣ (𝑛 − 𝑘) ∈ (bits‘𝐵)} = (bits‘(𝐵 · (2↑𝑘))))
96		ibar 536	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ (bits‘𝐴) → ((𝑛 − 𝑘) ∈ (bits‘𝐵) ↔ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))))
97	96	rabbidv 3420	. . . . . . . . . . 11 ⊢ (𝑘 ∈ (bits‘𝐴) → {𝑛 ∈ ℕ0 ∣ (𝑛 − 𝑘) ∈ (bits‘𝐵)} = {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))})
98	95, 97	sylan9req 2817	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ 𝑘 ∈ (bits‘𝐴)) → (bits‘(𝐵 · (2↑𝑘))) = {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))})
99	77	adantr 484	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ ¬ 𝑘 ∈ (bits‘𝐴)) → 𝐵 ∈ ℂ)
100	99	mul01d 11375	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ ¬ 𝑘 ∈ (bits‘𝐴)) → (𝐵 · 0) = 0)
101	100	fveq2d 6865	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ ¬ 𝑘 ∈ (bits‘𝐴)) → (bits‘(𝐵 · 0)) = (bits‘0))
102		simpr 488	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ ¬ 𝑘 ∈ (bits‘𝐴)) → ¬ 𝑘 ∈ (bits‘𝐴))
103	102	intnanrd 493	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ ¬ 𝑘 ∈ (bits‘𝐴)) → ¬ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵)))
104	103	ralrimivw 3157	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ ¬ 𝑘 ∈ (bits‘𝐴)) → ∀𝑛 ∈ ℕ0 ¬ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵)))
105		rabeq0 4339	. . . . . . . . . . . 12 ⊢ ({𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))} = ∅ ↔ ∀𝑛 ∈ ℕ0 ¬ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵)))
106	104, 105	sylibr 236	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ ¬ 𝑘 ∈ (bits‘𝐴)) → {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))} = ∅)
107	55, 101, 106	3eqtr4a 2822	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑘 ∈ ℕ0) ∧ ¬ 𝑘 ∈ (bits‘𝐴)) → (bits‘(𝐵 · 0)) = {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))})
108	91, 93, 98, 107	ifbothda 4516	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (bits‘(𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0))) = {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))})
109	108	oveq2d 7406	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → ((bits‘((𝐴 mod (2↑𝑘)) · 𝐵)) sadd (bits‘(𝐵 · if(𝑘 ∈ (bits‘𝐴), (2↑𝑘), 0)))) = ((bits‘((𝐴 mod (2↑𝑘)) · 𝐵)) sadd {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))}))
110	82, 89, 109	3eqtr2d 2802	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → (bits‘((𝐴 mod (2↑(𝑘 + 1))) · 𝐵)) = ((bits‘((𝐴 mod (2↑𝑘)) · 𝐵)) sadd {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))}))
111	62, 110	eqeq12d 2777	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → ((((bits‘𝐴) ∩ (0..^(𝑘 + 1))) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑(𝑘 + 1))) · 𝐵)) ↔ ((((bits‘𝐴) ∩ (0..^𝑘)) smul (bits‘𝐵)) sadd {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))}) = ((bits‘((𝐴 mod (2↑𝑘)) · 𝐵)) sadd {𝑛 ∈ ℕ0 ∣ (𝑘 ∈ (bits‘𝐴) ∧ (𝑛 − 𝑘) ∈ (bits‘𝐵))})))
112	57, 111	imbitrrid 248	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ ℕ0) → ((((bits‘𝐴) ∩ (0..^𝑘)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑘)) · 𝐵)) → (((bits‘𝐴) ∩ (0..^(𝑘 + 1))) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑(𝑘 + 1))) · 𝐵))))
113	112	expcom 417	. . . 4 ⊢ (𝑘 ∈ ℕ0 → (𝜑 → ((((bits‘𝐴) ∩ (0..^𝑘)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑘)) · 𝐵)) → (((bits‘𝐴) ∩ (0..^(𝑘 + 1))) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑(𝑘 + 1))) · 𝐵)))))
114	113	a2d 29	. . 3 ⊢ (𝑘 ∈ ℕ0 → ((𝜑 → (((bits‘𝐴) ∩ (0..^𝑘)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑘)) · 𝐵))) → (𝜑 → (((bits‘𝐴) ∩ (0..^(𝑘 + 1))) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑(𝑘 + 1))) · 𝐵)))))
115	21, 29, 37, 45, 56, 114	nn0ind 12661	. 2 ⊢ (𝑁 ∈ ℕ0 → (𝜑 → (((bits‘𝐴) ∩ (0..^𝑁)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑁)) · 𝐵))))
116	1, 115	mpcom 38	1 ⊢ (𝜑 → (((bits‘𝐴) ∩ (0..^𝑁)) smul (bits‘𝐵)) = (bits‘((𝐴 mod (2↑𝑁)) · 𝐵)))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 399   = wceq 1559   ∈ wcel 2141  ∀wral 3075  {crab 3413   ∩ cin 3901   ⊆ wss 3902  ∅c0 4283  ifcif 4477  ‘cfv 6515  (class class class)co 7390  ℂcc 11064  0cc0 11066  1c1 11067   + caddc 11069   · cmul 11071   − cmin 11407  ℕcn 12203  2c2 12265  ℕ₀cn0 12474  ℤcz 12561  ..^cfzo 13652   mod cmo 13872  ↑cexp 14067  bitscbits 16443   sadd csad 16444   smul csmu 16445

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-rep 5224  ax-sep 5243  ax-nul 5253  ax-pow 5319  ax-pr 5387  ax-un 7712  ax-inf2 9589  ax-cnex 11122  ax-resscn 11123  ax-1cn 11124  ax-icn 11125  ax-addcl 11126  ax-addrcl 11127  ax-mulcl 11128  ax-mulrcl 11129  ax-mulcom 11130  ax-addass 11131  ax-mulass 11132  ax-distr 11133  ax-i2m1 11134  ax-1ne0 11135  ax-1rid 11136  ax-rnegex 11137  ax-rrecex 11138  ax-cnre 11139  ax-pre-lttri 11140  ax-pre-lttrn 11141  ax-pre-ltadd 11142  ax-pre-mulgt0 11143  ax-pre-sup 11144

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3or 1098  df-3an 1099  df-xor 1531  df-tru 1562  df-fal 1572  df-had 1613  df-cad 1626  df-ex 1799  df-nf 1803  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-nel 3061  df-ral 3076  df-rex 3086  df-rmo 3366  df-reu 3367  df-rab 3414  df-v 3455  df-sbc 3743  df-csb 3851  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-pss 3922  df-nul 4284  df-if 4478  df-pw 4554  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4863  df-int 4903  df-iun 4948  df-disj 5065  df-br 5098  df-opab 5160  df-mpt 5179  df-tr 5205  df-id 5538  df-eprel 5543  df-po 5551  df-so 5552  df-fr 5596  df-se 5597  df-we 5598  df-xp 5649  df-rel 5650  df-cnv 5651  df-co 5652  df-dm 5653  df-rn 5654  df-res 5655  df-ima 5656  df-pred 6282  df-ord 6343  df-on 6344  df-lim 6345  df-suc 6346  df-iota 6471  df-fun 6517  df-fn 6518  df-f 6519  df-f1 6520  df-fo 6521  df-f1o 6522  df-fv 6523  df-isom 6524  df-riota 7347  df-ov 7393  df-oprab 7394  df-mpo 7395  df-om 7841  df-1st 7964  df-2nd 7965  df-frecs 8255  df-wrecs 8286  df-recs 8335  df-rdg 8374  df-1o 8430  df-2o 8431  df-oadd 8434  df-er 8671  df-map 8803  df-pm 8804  df-en 8921  df-dom 8922  df-sdom 8923  df-fin 8924  df-sup 9381  df-inf 9382  df-oi 9451  df-dju 9852  df-card 9890  df-pnf 11211  df-mnf 11212  df-xr 11213  df-ltxr 11214  df-le 11215  df-sub 11409  df-neg 11410  df-div 11838  df-nn 12204  df-2 12273  df-3 12274  df-n0 12475  df-xnn0 12548  df-z 12562  df-uz 12833  df-rp 12987  df-fz 13506  df-fzo 13653  df-fl 13795  df-mod 13873  df-seq 14008  df-exp 14068  df-hash 14337  df-cj 15116  df-re 15117  df-im 15118  df-sqrt 15252  df-abs 15253  df-clim 15505  df-sum 15704  df-dvds 16277  df-bits 16446  df-sad 16475  df-smu 16500

This theorem is referenced by:  smumul  16517