2elfz2melfz - Mathbox for Alexander van der Vekens

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Theorem 2elfz2melfz 47268

Description: If the sum of two integers of a 0-based finite set of sequential integers is greater than the upper bound, the difference between one of the integers and the difference between the upper bound and the other integer is in the 0-based finite set of sequential integers with the first integer as upper bound. (Contributed by Alexander van der Vekens, 7-Apr-2018.) (Revised by Alexander van der Vekens, 31-May-2018.)

**Assertion**
Ref	Expression
2elfz2melfz	⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → (𝑁 < (𝐴 + 𝐵) → (𝐵 − (𝑁 − 𝐴)) ∈ (0...𝐴)))

**Proof of Theorem 2elfz2melfz**
Step	Hyp	Ref	Expression
1		elfzelz 13561	. . . . 5 ⊢ (𝐴 ∈ (0...𝑁) → 𝐴 ∈ ℤ)
2		elfzel2 13559	. . . . . 6 ⊢ (𝐵 ∈ (0...𝑁) → 𝑁 ∈ ℤ)
3		elfzelz 13561	. . . . . 6 ⊢ (𝐵 ∈ (0...𝑁) → 𝐵 ∈ ℤ)
4		simplr 769	. . . . . . . . . 10 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → 𝐵 ∈ ℤ)
5		zsubcl 12657	. . . . . . . . . . 11 ⊢ ((𝑁 ∈ ℤ ∧ 𝐴 ∈ ℤ) → (𝑁 − 𝐴) ∈ ℤ)
6	5	adantlr 715	. . . . . . . . . 10 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → (𝑁 − 𝐴) ∈ ℤ)
7	4, 6	zsubcld 12725	. . . . . . . . 9 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → (𝐵 − (𝑁 − 𝐴)) ∈ ℤ)
8	7	adantr 480	. . . . . . . 8 ⊢ ((((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) ∧ 𝑁 < (𝐴 + 𝐵)) → (𝐵 − (𝑁 − 𝐴)) ∈ ℤ)
9		zre 12615	. . . . . . . . . . . 12 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ)
10	9	ad2antrr 726	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → 𝑁 ∈ ℝ)
11		zaddcl 12655	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → (𝐴 + 𝐵) ∈ ℤ)
12	11	zred 12720	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → (𝐴 + 𝐵) ∈ ℝ)
13	12	expcom 413	. . . . . . . . . . . . 13 ⊢ (𝐵 ∈ ℤ → (𝐴 ∈ ℤ → (𝐴 + 𝐵) ∈ ℝ))
14	13	adantl 481	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) → (𝐴 ∈ ℤ → (𝐴 + 𝐵) ∈ ℝ))
15	14	imp 406	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → (𝐴 + 𝐵) ∈ ℝ)
16	10, 15, 10	ltsub1d 11870	. . . . . . . . . 10 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → (𝑁 < (𝐴 + 𝐵) ↔ (𝑁 − 𝑁) < ((𝐴 + 𝐵) − 𝑁)))
17		zre 12615	. . . . . . . . . . . . . 14 ⊢ (𝐵 ∈ ℤ → 𝐵 ∈ ℝ)
18	9, 17	anim12i 613	. . . . . . . . . . . . 13 ⊢ ((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) → (𝑁 ∈ ℝ ∧ 𝐵 ∈ ℝ))
19		zre 12615	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ ℤ → 𝐴 ∈ ℝ)
20	18, 19	anim12i 613	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → ((𝑁 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝐴 ∈ ℝ))
21		id 22	. . . . . . . . . . . . . . 15 ⊢ (𝑁 ∈ ℝ → 𝑁 ∈ ℝ)
22	21, 21	resubcld 11689	. . . . . . . . . . . . . 14 ⊢ (𝑁 ∈ ℝ → (𝑁 − 𝑁) ∈ ℝ)
23	22	ad2antrr 726	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝐴 ∈ ℝ) → (𝑁 − 𝑁) ∈ ℝ)
24		readdcl 11236	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 + 𝐵) ∈ ℝ)
25	24	expcom 413	. . . . . . . . . . . . . . . 16 ⊢ (𝐵 ∈ ℝ → (𝐴 ∈ ℝ → (𝐴 + 𝐵) ∈ ℝ))
26	25	adantl 481	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ∈ ℝ → (𝐴 + 𝐵) ∈ ℝ))
27	26	imp 406	. . . . . . . . . . . . . 14 ⊢ (((𝑁 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝐴 ∈ ℝ) → (𝐴 + 𝐵) ∈ ℝ)
28		simpll 767	. . . . . . . . . . . . . 14 ⊢ (((𝑁 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝐴 ∈ ℝ) → 𝑁 ∈ ℝ)
29	27, 28	resubcld 11689	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝐴 ∈ ℝ) → ((𝐴 + 𝐵) − 𝑁) ∈ ℝ)
30	23, 29	jca 511	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℝ ∧ 𝐵 ∈ ℝ) ∧ 𝐴 ∈ ℝ) → ((𝑁 − 𝑁) ∈ ℝ ∧ ((𝐴 + 𝐵) − 𝑁) ∈ ℝ))
31		ltle 11347	. . . . . . . . . . . 12 ⊢ (((𝑁 − 𝑁) ∈ ℝ ∧ ((𝐴 + 𝐵) − 𝑁) ∈ ℝ) → ((𝑁 − 𝑁) < ((𝐴 + 𝐵) − 𝑁) → (𝑁 − 𝑁) ≤ ((𝐴 + 𝐵) − 𝑁)))
32	20, 30, 31	3syl 18	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → ((𝑁 − 𝑁) < ((𝐴 + 𝐵) − 𝑁) → (𝑁 − 𝑁) ≤ ((𝐴 + 𝐵) − 𝑁)))
33		zcn 12616	. . . . . . . . . . . . . 14 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℂ)
34	33	subidd 11606	. . . . . . . . . . . . 13 ⊢ (𝑁 ∈ ℤ → (𝑁 − 𝑁) = 0)
35	34	ad2antrr 726	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → (𝑁 − 𝑁) = 0)
36		zcn 12616	. . . . . . . . . . . . . . 15 ⊢ (𝐵 ∈ ℤ → 𝐵 ∈ ℂ)
37	36	adantl 481	. . . . . . . . . . . . . 14 ⊢ ((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) → 𝐵 ∈ ℂ)
38	37	adantr 480	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → 𝐵 ∈ ℂ)
39	33	ad2antrr 726	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → 𝑁 ∈ ℂ)
40		zcn 12616	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ ℤ → 𝐴 ∈ ℂ)
41	40	adantl 481	. . . . . . . . . . . . 13 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → 𝐴 ∈ ℂ)
42		simp3 1137	. . . . . . . . . . . . . . . 16 ⊢ ((𝐵 ∈ ℂ ∧ 𝑁 ∈ ℂ ∧ 𝐴 ∈ ℂ) → 𝐴 ∈ ℂ)
43		simp1 1135	. . . . . . . . . . . . . . . 16 ⊢ ((𝐵 ∈ ℂ ∧ 𝑁 ∈ ℂ ∧ 𝐴 ∈ ℂ) → 𝐵 ∈ ℂ)
44	42, 43	addcomd 11461	. . . . . . . . . . . . . . 15 ⊢ ((𝐵 ∈ ℂ ∧ 𝑁 ∈ ℂ ∧ 𝐴 ∈ ℂ) → (𝐴 + 𝐵) = (𝐵 + 𝐴))
45	44	oveq1d 7446	. . . . . . . . . . . . . 14 ⊢ ((𝐵 ∈ ℂ ∧ 𝑁 ∈ ℂ ∧ 𝐴 ∈ ℂ) → ((𝐴 + 𝐵) − 𝑁) = ((𝐵 + 𝐴) − 𝑁))
46		subsub3 11539	. . . . . . . . . . . . . 14 ⊢ ((𝐵 ∈ ℂ ∧ 𝑁 ∈ ℂ ∧ 𝐴 ∈ ℂ) → (𝐵 − (𝑁 − 𝐴)) = ((𝐵 + 𝐴) − 𝑁))
47	45, 46	eqtr4d 2778	. . . . . . . . . . . . 13 ⊢ ((𝐵 ∈ ℂ ∧ 𝑁 ∈ ℂ ∧ 𝐴 ∈ ℂ) → ((𝐴 + 𝐵) − 𝑁) = (𝐵 − (𝑁 − 𝐴)))
48	38, 39, 41, 47	syl3anc 1370	. . . . . . . . . . . 12 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → ((𝐴 + 𝐵) − 𝑁) = (𝐵 − (𝑁 − 𝐴)))
49	35, 48	breq12d 5161	. . . . . . . . . . 11 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → ((𝑁 − 𝑁) ≤ ((𝐴 + 𝐵) − 𝑁) ↔ 0 ≤ (𝐵 − (𝑁 − 𝐴))))
50	32, 49	sylibd 239	. . . . . . . . . 10 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → ((𝑁 − 𝑁) < ((𝐴 + 𝐵) − 𝑁) → 0 ≤ (𝐵 − (𝑁 − 𝐴))))
51	16, 50	sylbid 240	. . . . . . . . 9 ⊢ (((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) → (𝑁 < (𝐴 + 𝐵) → 0 ≤ (𝐵 − (𝑁 − 𝐴))))
52	51	imp 406	. . . . . . . 8 ⊢ ((((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) ∧ 𝑁 < (𝐴 + 𝐵)) → 0 ≤ (𝐵 − (𝑁 − 𝐴)))
53		elnn0z 12624	. . . . . . . 8 ⊢ ((𝐵 − (𝑁 − 𝐴)) ∈ ℕ₀ ↔ ((𝐵 − (𝑁 − 𝐴)) ∈ ℤ ∧ 0 ≤ (𝐵 − (𝑁 − 𝐴))))
54	8, 52, 53	sylanbrc 583	. . . . . . 7 ⊢ ((((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) ∧ 𝐴 ∈ ℤ) ∧ 𝑁 < (𝐴 + 𝐵)) → (𝐵 − (𝑁 − 𝐴)) ∈ ℕ₀)
55	54	exp31 419	. . . . . 6 ⊢ ((𝑁 ∈ ℤ ∧ 𝐵 ∈ ℤ) → (𝐴 ∈ ℤ → (𝑁 < (𝐴 + 𝐵) → (𝐵 − (𝑁 − 𝐴)) ∈ ℕ₀)))
56	2, 3, 55	syl2anc 584	. . . . 5 ⊢ (𝐵 ∈ (0...𝑁) → (𝐴 ∈ ℤ → (𝑁 < (𝐴 + 𝐵) → (𝐵 − (𝑁 − 𝐴)) ∈ ℕ₀)))
57	1, 56	mpan9 506	. . . 4 ⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → (𝑁 < (𝐴 + 𝐵) → (𝐵 − (𝑁 − 𝐴)) ∈ ℕ₀))
58	57	imp 406	. . 3 ⊢ (((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) ∧ 𝑁 < (𝐴 + 𝐵)) → (𝐵 − (𝑁 − 𝐴)) ∈ ℕ₀)
59		elfznn0 13657	. . . 4 ⊢ (𝐴 ∈ (0...𝑁) → 𝐴 ∈ ℕ₀)
60	59	ad2antrr 726	. . 3 ⊢ (((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) ∧ 𝑁 < (𝐴 + 𝐵)) → 𝐴 ∈ ℕ₀)
61		elfzle2 13565	. . . . . . 7 ⊢ (𝐵 ∈ (0...𝑁) → 𝐵 ≤ 𝑁)
62	61	adantl 481	. . . . . 6 ⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → 𝐵 ≤ 𝑁)
63		elfzel2 13559	. . . . . . . . . 10 ⊢ (𝐴 ∈ (0...𝑁) → 𝑁 ∈ ℤ)
64	63	zcnd 12721	. . . . . . . . 9 ⊢ (𝐴 ∈ (0...𝑁) → 𝑁 ∈ ℂ)
65	1	zcnd 12721	. . . . . . . . 9 ⊢ (𝐴 ∈ (0...𝑁) → 𝐴 ∈ ℂ)
66	64, 65	jca 511	. . . . . . . 8 ⊢ (𝐴 ∈ (0...𝑁) → (𝑁 ∈ ℂ ∧ 𝐴 ∈ ℂ))
67	66	adantr 480	. . . . . . 7 ⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → (𝑁 ∈ ℂ ∧ 𝐴 ∈ ℂ))
68		npcan 11515	. . . . . . 7 ⊢ ((𝑁 ∈ ℂ ∧ 𝐴 ∈ ℂ) → ((𝑁 − 𝐴) + 𝐴) = 𝑁)
69	67, 68	syl 17	. . . . . 6 ⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → ((𝑁 − 𝐴) + 𝐴) = 𝑁)
70	62, 69	breqtrrd 5176	. . . . 5 ⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → 𝐵 ≤ ((𝑁 − 𝐴) + 𝐴))
71	3	zred 12720	. . . . . . 7 ⊢ (𝐵 ∈ (0...𝑁) → 𝐵 ∈ ℝ)
72	71	adantl 481	. . . . . 6 ⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → 𝐵 ∈ ℝ)
73	63	zred 12720	. . . . . . . 8 ⊢ (𝐴 ∈ (0...𝑁) → 𝑁 ∈ ℝ)
74	1	zred 12720	. . . . . . . 8 ⊢ (𝐴 ∈ (0...𝑁) → 𝐴 ∈ ℝ)
75	73, 74	resubcld 11689	. . . . . . 7 ⊢ (𝐴 ∈ (0...𝑁) → (𝑁 − 𝐴) ∈ ℝ)
76	75	adantr 480	. . . . . 6 ⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → (𝑁 − 𝐴) ∈ ℝ)
77	74	adantr 480	. . . . . 6 ⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → 𝐴 ∈ ℝ)
78	72, 76, 77	lesubadd2d 11860	. . . . 5 ⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → ((𝐵 − (𝑁 − 𝐴)) ≤ 𝐴 ↔ 𝐵 ≤ ((𝑁 − 𝐴) + 𝐴)))
79	70, 78	mpbird 257	. . . 4 ⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → (𝐵 − (𝑁 − 𝐴)) ≤ 𝐴)
80	79	adantr 480	. . 3 ⊢ (((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) ∧ 𝑁 < (𝐴 + 𝐵)) → (𝐵 − (𝑁 − 𝐴)) ≤ 𝐴)
81		elfz2nn0 13655	. . 3 ⊢ ((𝐵 − (𝑁 − 𝐴)) ∈ (0...𝐴) ↔ ((𝐵 − (𝑁 − 𝐴)) ∈ ℕ₀ ∧ 𝐴 ∈ ℕ₀ ∧ (𝐵 − (𝑁 − 𝐴)) ≤ 𝐴))
82	58, 60, 80, 81	syl3anbrc 1342	. 2 ⊢ (((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) ∧ 𝑁 < (𝐴 + 𝐵)) → (𝐵 − (𝑁 − 𝐴)) ∈ (0...𝐴))
83	82	ex 412	1 ⊢ ((𝐴 ∈ (0...𝑁) ∧ 𝐵 ∈ (0...𝑁)) → (𝑁 < (𝐴 + 𝐵) → (𝐵 − (𝑁 − 𝐴)) ∈ (0...𝐴)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1086 = wceq 1537 ∈ wcel 2106 class class class wbr 5148 (class class class)co 7431 ℂcc 11151 ℝcr 11152 0cc0 11153 + caddc 11156 < clt 11293 ≤ cle 11294 − cmin 11490 ℕ₀cn0 12524 ℤcz 12611 ...cfz 13544

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-cnex 11209 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-lim 6391 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-om 7888 df-1st 8013 df-2nd 8014 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-rdg 8449 df-er 8744 df-en 8985 df-dom 8986 df-sdom 8987 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-nn 12265 df-n0 12525 df-z 12612 df-uz 12877 df-fz 13545

This theorem is referenced by: (None)

W3C validator