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Theorem divalgb 12692

Description: Express the division algorithm as stated in divalg 12691 in terms of ∥. (Contributed by Paul Chapman, 31-Mar-2011.)

**Assertion**
Ref	Expression
divalgb	⊢ ((𝑁 ∈ ℤ ∧ 𝐷 ∈ ℤ ∧ 𝐷 ≠ 0) → (∃!𝑟 ∈ ℤ ∃𝑞 ∈ ℤ (0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)) ↔ ∃!𝑟 ∈ ℕ₀ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))))

Distinct variable groups: 𝐷,𝑞,𝑟 𝑁,𝑞,𝑟

**Proof of Theorem divalgb**
Step	Hyp	Ref	Expression
1		df-3an 1011	. . . . . . . . 9 ⊢ ((0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)) ↔ ((0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷)) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)))
2	1	rexbii 2557	. . . . . . . 8 ⊢ (∃𝑞 ∈ ℤ (0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)) ↔ ∃𝑞 ∈ ℤ ((0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷)) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)))
3		r19.42v 2708	. . . . . . . 8 ⊢ (∃𝑞 ∈ ℤ ((0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷)) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)) ↔ ((0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷)) ∧ ∃𝑞 ∈ ℤ 𝑁 = ((𝑞 · 𝐷) + 𝑟)))
4	2, 3	bitri 184	. . . . . . 7 ⊢ (∃𝑞 ∈ ℤ (0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)) ↔ ((0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷)) ∧ ∃𝑞 ∈ ℤ 𝑁 = ((𝑞 · 𝐷) + 𝑟)))
5		zsubcl 9685	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ) → (𝑁 − 𝑟) ∈ ℤ)
6		divides 12556	. . . . . . . . . . . 12 ⊢ ((𝐷 ∈ ℤ ∧ (𝑁 − 𝑟) ∈ ℤ) → (𝐷 ∥ (𝑁 − 𝑟) ↔ ∃𝑞 ∈ ℤ (𝑞 · 𝐷) = (𝑁 − 𝑟)))
7	5, 6	sylan2 286	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ ℤ ∧ (𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ)) → (𝐷 ∥ (𝑁 − 𝑟) ↔ ∃𝑞 ∈ ℤ (𝑞 · 𝐷) = (𝑁 − 𝑟)))
8	7	3impb 1230	. . . . . . . . . 10 ⊢ ((𝐷 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ) → (𝐷 ∥ (𝑁 − 𝑟) ↔ ∃𝑞 ∈ ℤ (𝑞 · 𝐷) = (𝑁 − 𝑟)))
9	8	3com12 1238	. . . . . . . . 9 ⊢ ((𝑁 ∈ ℤ ∧ 𝐷 ∈ ℤ ∧ 𝑟 ∈ ℤ) → (𝐷 ∥ (𝑁 − 𝑟) ↔ ∃𝑞 ∈ ℤ (𝑞 · 𝐷) = (𝑁 − 𝑟)))
10		zcn 9649	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℂ)
11		zcn 9649	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑟 ∈ ℤ → 𝑟 ∈ ℂ)
12		zmulcl 9698	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑞 ∈ ℤ ∧ 𝐷 ∈ ℤ) → (𝑞 · 𝐷) ∈ ℤ)
13	12	zcnd 9769	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑞 ∈ ℤ ∧ 𝐷 ∈ ℤ) → (𝑞 · 𝐷) ∈ ℂ)
14		subadd 8529	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑁 ∈ ℂ ∧ 𝑟 ∈ ℂ ∧ (𝑞 · 𝐷) ∈ ℂ) → ((𝑁 − 𝑟) = (𝑞 · 𝐷) ↔ (𝑟 + (𝑞 · 𝐷)) = 𝑁))
15	10, 11, 13, 14	syl3an 1320	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ ∧ (𝑞 ∈ ℤ ∧ 𝐷 ∈ ℤ)) → ((𝑁 − 𝑟) = (𝑞 · 𝐷) ↔ (𝑟 + (𝑞 · 𝐷)) = 𝑁))
16		addcom 8463	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑟 ∈ ℂ ∧ (𝑞 · 𝐷) ∈ ℂ) → (𝑟 + (𝑞 · 𝐷)) = ((𝑞 · 𝐷) + 𝑟))
17	11, 13, 16	syl2an 289	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑟 ∈ ℤ ∧ (𝑞 ∈ ℤ ∧ 𝐷 ∈ ℤ)) → (𝑟 + (𝑞 · 𝐷)) = ((𝑞 · 𝐷) + 𝑟))
18	17	3adant1 1046	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ ∧ (𝑞 ∈ ℤ ∧ 𝐷 ∈ ℤ)) → (𝑟 + (𝑞 · 𝐷)) = ((𝑞 · 𝐷) + 𝑟))
19	18	eqeq1d 2247	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ ∧ (𝑞 ∈ ℤ ∧ 𝐷 ∈ ℤ)) → ((𝑟 + (𝑞 · 𝐷)) = 𝑁 ↔ ((𝑞 · 𝐷) + 𝑟) = 𝑁))
20	15, 19	bitrd 188	. . . . . . . . . . . . . . . 16 ⊢ ((𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ ∧ (𝑞 ∈ ℤ ∧ 𝐷 ∈ ℤ)) → ((𝑁 − 𝑟) = (𝑞 · 𝐷) ↔ ((𝑞 · 𝐷) + 𝑟) = 𝑁))
21		eqcom 2240	. . . . . . . . . . . . . . . 16 ⊢ ((𝑁 − 𝑟) = (𝑞 · 𝐷) ↔ (𝑞 · 𝐷) = (𝑁 − 𝑟))
22		eqcom 2240	. . . . . . . . . . . . . . . 16 ⊢ (((𝑞 · 𝐷) + 𝑟) = 𝑁 ↔ 𝑁 = ((𝑞 · 𝐷) + 𝑟))
23	20, 21, 22	3bitr3g 222	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ ∧ (𝑞 ∈ ℤ ∧ 𝐷 ∈ ℤ)) → ((𝑞 · 𝐷) = (𝑁 − 𝑟) ↔ 𝑁 = ((𝑞 · 𝐷) + 𝑟)))
24	23	3expia 1236	. . . . . . . . . . . . . 14 ⊢ ((𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ) → ((𝑞 ∈ ℤ ∧ 𝐷 ∈ ℤ) → ((𝑞 · 𝐷) = (𝑁 − 𝑟) ↔ 𝑁 = ((𝑞 · 𝐷) + 𝑟))))
25	24	expcomd 1491	. . . . . . . . . . . . 13 ⊢ ((𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ) → (𝐷 ∈ ℤ → (𝑞 ∈ ℤ → ((𝑞 · 𝐷) = (𝑁 − 𝑟) ↔ 𝑁 = ((𝑞 · 𝐷) + 𝑟)))))
26	25	3impia 1231	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ ∧ 𝐷 ∈ ℤ) → (𝑞 ∈ ℤ → ((𝑞 · 𝐷) = (𝑁 − 𝑟) ↔ 𝑁 = ((𝑞 · 𝐷) + 𝑟))))
27	26	imp 124	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ ∧ 𝐷 ∈ ℤ) ∧ 𝑞 ∈ ℤ) → ((𝑞 · 𝐷) = (𝑁 − 𝑟) ↔ 𝑁 = ((𝑞 · 𝐷) + 𝑟)))
28	27	rexbidva 2547	. . . . . . . . . 10 ⊢ ((𝑁 ∈ ℤ ∧ 𝑟 ∈ ℤ ∧ 𝐷 ∈ ℤ) → (∃𝑞 ∈ ℤ (𝑞 · 𝐷) = (𝑁 − 𝑟) ↔ ∃𝑞 ∈ ℤ 𝑁 = ((𝑞 · 𝐷) + 𝑟)))
29	28	3com23 1240	. . . . . . . . 9 ⊢ ((𝑁 ∈ ℤ ∧ 𝐷 ∈ ℤ ∧ 𝑟 ∈ ℤ) → (∃𝑞 ∈ ℤ (𝑞 · 𝐷) = (𝑁 − 𝑟) ↔ ∃𝑞 ∈ ℤ 𝑁 = ((𝑞 · 𝐷) + 𝑟)))
30	9, 29	bitrd 188	. . . . . . . 8 ⊢ ((𝑁 ∈ ℤ ∧ 𝐷 ∈ ℤ ∧ 𝑟 ∈ ℤ) → (𝐷 ∥ (𝑁 − 𝑟) ↔ ∃𝑞 ∈ ℤ 𝑁 = ((𝑞 · 𝐷) + 𝑟)))
31	30	anbi2d 468	. . . . . . 7 ⊢ ((𝑁 ∈ ℤ ∧ 𝐷 ∈ ℤ ∧ 𝑟 ∈ ℤ) → (((0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷)) ∧ 𝐷 ∥ (𝑁 − 𝑟)) ↔ ((0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷)) ∧ ∃𝑞 ∈ ℤ 𝑁 = ((𝑞 · 𝐷) + 𝑟))))
32	4, 31	bitr4id 199	. . . . . 6 ⊢ ((𝑁 ∈ ℤ ∧ 𝐷 ∈ ℤ ∧ 𝑟 ∈ ℤ) → (∃𝑞 ∈ ℤ (0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)) ↔ ((0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷)) ∧ 𝐷 ∥ (𝑁 − 𝑟))))
33		anass 405	. . . . . 6 ⊢ (((0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷)) ∧ 𝐷 ∥ (𝑁 − 𝑟)) ↔ (0 ≤ 𝑟 ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))))
34	32, 33	bitrdi 196	. . . . 5 ⊢ ((𝑁 ∈ ℤ ∧ 𝐷 ∈ ℤ ∧ 𝑟 ∈ ℤ) → (∃𝑞 ∈ ℤ (0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)) ↔ (0 ≤ 𝑟 ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟)))))
35	34	3expa 1234	. . . 4 ⊢ (((𝑁 ∈ ℤ ∧ 𝐷 ∈ ℤ) ∧ 𝑟 ∈ ℤ) → (∃𝑞 ∈ ℤ (0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)) ↔ (0 ≤ 𝑟 ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟)))))
36	35	reubidva 2736	. . 3 ⊢ ((𝑁 ∈ ℤ ∧ 𝐷 ∈ ℤ) → (∃!𝑟 ∈ ℤ ∃𝑞 ∈ ℤ (0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)) ↔ ∃!𝑟 ∈ ℤ (0 ≤ 𝑟 ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟)))))
37		elnn0z 9657	. . . . . . 7 ⊢ (𝑟 ∈ ℕ₀ ↔ (𝑟 ∈ ℤ ∧ 0 ≤ 𝑟))
38	37	anbi1i 462	. . . . . 6 ⊢ ((𝑟 ∈ ℕ₀ ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))) ↔ ((𝑟 ∈ ℤ ∧ 0 ≤ 𝑟) ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))))
39		anass 405	. . . . . 6 ⊢ (((𝑟 ∈ ℤ ∧ 0 ≤ 𝑟) ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))) ↔ (𝑟 ∈ ℤ ∧ (0 ≤ 𝑟 ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟)))))
40	38, 39	bitri 184	. . . . 5 ⊢ ((𝑟 ∈ ℕ₀ ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))) ↔ (𝑟 ∈ ℤ ∧ (0 ≤ 𝑟 ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟)))))
41	40	eubii 2095	. . . 4 ⊢ (∃!𝑟(𝑟 ∈ ℕ₀ ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))) ↔ ∃!𝑟(𝑟 ∈ ℤ ∧ (0 ≤ 𝑟 ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟)))))
42		df-reu 2535	. . . 4 ⊢ (∃!𝑟 ∈ ℕ₀ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟)) ↔ ∃!𝑟(𝑟 ∈ ℕ₀ ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))))
43		df-reu 2535	. . . 4 ⊢ (∃!𝑟 ∈ ℤ (0 ≤ 𝑟 ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))) ↔ ∃!𝑟(𝑟 ∈ ℤ ∧ (0 ≤ 𝑟 ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟)))))
44	41, 42, 43	3bitr4ri 213	. . 3 ⊢ (∃!𝑟 ∈ ℤ (0 ≤ 𝑟 ∧ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))) ↔ ∃!𝑟 ∈ ℕ₀ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟)))
45	36, 44	bitrdi 196	. 2 ⊢ ((𝑁 ∈ ℤ ∧ 𝐷 ∈ ℤ) → (∃!𝑟 ∈ ℤ ∃𝑞 ∈ ℤ (0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)) ↔ ∃!𝑟 ∈ ℕ₀ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))))
46	45	3adant3 1048	1 ⊢ ((𝑁 ∈ ℤ ∧ 𝐷 ∈ ℤ ∧ 𝐷 ≠ 0) → (∃!𝑟 ∈ ℤ ∃𝑞 ∈ ℤ (0 ≤ 𝑟 ∧ 𝑟 < (abs‘𝐷) ∧ 𝑁 = ((𝑞 · 𝐷) + 𝑟)) ↔ ∃!𝑟 ∈ ℕ₀ (𝑟 < (abs‘𝐷) ∧ 𝐷 ∥ (𝑁 − 𝑟))))

Colors of variables: wff set class

This proof depends on syntax axioms: → wi 4 ∧ wa 104 ↔ wb 105 ∧ w3a 1009 = wceq 1402 ∃!weu 2086 ∈ wcel 2209 ≠ wne 2420 ∃wrex 2529 ∃!wreu 2530 class class class wbr 4130 ‘cfv 5377 (class class class)co 6085 ℂcc 8177 0cc0 8179 + caddc 8182 · cmul 8184 < clt 8360 ≤ cle 8361 − cmin 8497 ℕ₀cn0 9563 ℤcz 9644 abscabs 11763 ∥ cdvds 12554

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-cnex 8270 ax-resscn 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-mulrcl 8278 ax-addcom 8279 ax-mulcom 8280 ax-addass 8281 ax-mulass 8282 ax-distr 8283 ax-i2m1 8284 ax-0lt1 8285 ax-1rid 8286 ax-0id 8287 ax-rnegex 8288 ax-cnre 8290 ax-pre-ltirr 8291 ax-pre-ltwlin 8292 ax-pre-lttrn 8293 ax-pre-ltadd 8295

This proof depends on definitions: df-bi 117 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-br 4131 df-opab 4193 df-id 4438 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-iota 5337 df-fun 5379 df-fv 5385 df-riota 6038 df-ov 6088 df-oprab 6089 df-mpo 6090 df-pnf 8362 df-mnf 8363 df-xr 8364 df-ltxr 8365 df-le 8366 df-sub 8499 df-neg 8500 df-inn 9305 df-n0 9564 df-z 9645 df-dvds 12555

This theorem is used by: divalg2 12693

W3C validator