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Theorem incsequz 32714

Description: An increasing sequence of positive integers takes on indefinitely large values. (Contributed by Jeff Madsen, 2-Sep-2009.)

**Assertion**
Ref	Expression
incsequz	⊢ ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)) ∧ 𝐴 ∈ ℕ) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝐴))

Distinct variable groups: 𝑚,𝐹,𝑛 𝐴,𝑚,𝑛

Proof of Theorem incsequz Dummy variables 𝑘 𝑝 𝑞 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		fveq2 6103	. . . . . . 7 ⊢ (𝑝 = 1 → (ℤ_≥‘𝑝) = (ℤ_≥‘1))
2	1	eleq2d 2673	. . . . . 6 ⊢ (𝑝 = 1 → ((𝐹‘𝑛) ∈ (ℤ_≥‘𝑝) ↔ (𝐹‘𝑛) ∈ (ℤ_≥‘1)))
3	2	rexbidv 3034	. . . . 5 ⊢ (𝑝 = 1 → (∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑝) ↔ ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘1)))
4	3	imbi2d 329	. . . 4 ⊢ (𝑝 = 1 → (((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑝)) ↔ ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘1))))
5		fveq2 6103	. . . . . . 7 ⊢ (𝑝 = 𝑞 → (ℤ_≥‘𝑝) = (ℤ_≥‘𝑞))
6	5	eleq2d 2673	. . . . . 6 ⊢ (𝑝 = 𝑞 → ((𝐹‘𝑛) ∈ (ℤ_≥‘𝑝) ↔ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑞)))
7	6	rexbidv 3034	. . . . 5 ⊢ (𝑝 = 𝑞 → (∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑝) ↔ ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑞)))
8	7	imbi2d 329	. . . 4 ⊢ (𝑝 = 𝑞 → (((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑝)) ↔ ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑞))))
9		fveq2 6103	. . . . . . 7 ⊢ (𝑝 = (𝑞 + 1) → (ℤ_≥‘𝑝) = (ℤ_≥‘(𝑞 + 1)))
10	9	eleq2d 2673	. . . . . 6 ⊢ (𝑝 = (𝑞 + 1) → ((𝐹‘𝑛) ∈ (ℤ_≥‘𝑝) ↔ (𝐹‘𝑛) ∈ (ℤ_≥‘(𝑞 + 1))))
11	10	rexbidv 3034	. . . . 5 ⊢ (𝑝 = (𝑞 + 1) → (∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑝) ↔ ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘(𝑞 + 1))))
12	11	imbi2d 329	. . . 4 ⊢ (𝑝 = (𝑞 + 1) → (((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑝)) ↔ ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘(𝑞 + 1)))))
13		fveq2 6103	. . . . . . 7 ⊢ (𝑝 = 𝐴 → (ℤ_≥‘𝑝) = (ℤ_≥‘𝐴))
14	13	eleq2d 2673	. . . . . 6 ⊢ (𝑝 = 𝐴 → ((𝐹‘𝑛) ∈ (ℤ_≥‘𝑝) ↔ (𝐹‘𝑛) ∈ (ℤ_≥‘𝐴)))
15	14	rexbidv 3034	. . . . 5 ⊢ (𝑝 = 𝐴 → (∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑝) ↔ ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝐴)))
16	15	imbi2d 329	. . . 4 ⊢ (𝑝 = 𝐴 → (((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑝)) ↔ ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝐴))))
17		1nn 10908	. . . . . . 7 ⊢ 1 ∈ ℕ
18	17	ne0ii 3882	. . . . . 6 ⊢ ℕ ≠ ∅
19		ffvelrn 6265	. . . . . . . 8 ⊢ ((𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ) → (𝐹‘𝑛) ∈ ℕ)
20		elnnuz 11600	. . . . . . . 8 ⊢ ((𝐹‘𝑛) ∈ ℕ ↔ (𝐹‘𝑛) ∈ (ℤ_≥‘1))
21	19, 20	sylib 207	. . . . . . 7 ⊢ ((𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ) → (𝐹‘𝑛) ∈ (ℤ_≥‘1))
22	21	ralrimiva 2949	. . . . . 6 ⊢ (𝐹:ℕ⟶ℕ → ∀𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘1))
23		r19.2z 4012	. . . . . 6 ⊢ ((ℕ ≠ ∅ ∧ ∀𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘1)) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘1))
24	18, 22, 23	sylancr 694	. . . . 5 ⊢ (𝐹:ℕ⟶ℕ → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘1))
25	24	adantr 480	. . . 4 ⊢ ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘1))
26		peano2nn 10909	. . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (𝑛 + 1) ∈ ℕ)
27	26	adantl 481	. . . . . . . . 9 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → (𝑛 + 1) ∈ ℕ)
28		nnre 10904	. . . . . . . . . . . . 13 ⊢ (𝑞 ∈ ℕ → 𝑞 ∈ ℝ)
29	28	ad2antrr 758	. . . . . . . . . . . 12 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → 𝑞 ∈ ℝ)
30	19	nnred 10912	. . . . . . . . . . . . . 14 ⊢ ((𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ) → (𝐹‘𝑛) ∈ ℝ)
31	30	adantlr 747	. . . . . . . . . . . . 13 ⊢ (((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) ∧ 𝑛 ∈ ℕ) → (𝐹‘𝑛) ∈ ℝ)
32	31	adantll 746	. . . . . . . . . . . 12 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → (𝐹‘𝑛) ∈ ℝ)
33		1red 9934	. . . . . . . . . . . 12 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → 1 ∈ ℝ)
34	29, 32, 33	leadd1d 10500	. . . . . . . . . . 11 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → (𝑞 ≤ (𝐹‘𝑛) ↔ (𝑞 + 1) ≤ ((𝐹‘𝑛) + 1)))
35		fveq2 6103	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑚 = 𝑛 → (𝐹‘𝑚) = (𝐹‘𝑛))
36		oveq1 6556	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑚 = 𝑛 → (𝑚 + 1) = (𝑛 + 1))
37	36	fveq2d 6107	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑚 = 𝑛 → (𝐹‘(𝑚 + 1)) = (𝐹‘(𝑛 + 1)))
38	35, 37	breq12d 4596	. . . . . . . . . . . . . . . . 17 ⊢ (𝑚 = 𝑛 → ((𝐹‘𝑚) < (𝐹‘(𝑚 + 1)) ↔ (𝐹‘𝑛) < (𝐹‘(𝑛 + 1))))
39	38	rspcv 3278	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 ∈ ℕ → (∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)) → (𝐹‘𝑛) < (𝐹‘(𝑛 + 1))))
40	39	imdistani 722	. . . . . . . . . . . . . . 15 ⊢ ((𝑛 ∈ ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → (𝑛 ∈ ℕ ∧ (𝐹‘𝑛) < (𝐹‘(𝑛 + 1))))
41		ffvelrn 6265	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐹:ℕ⟶ℕ ∧ (𝑛 + 1) ∈ ℕ) → (𝐹‘(𝑛 + 1)) ∈ ℕ)
42	26, 41	sylan2 490	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ) → (𝐹‘(𝑛 + 1)) ∈ ℕ)
43		nnltp1le 11310	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐹‘𝑛) ∈ ℕ ∧ (𝐹‘(𝑛 + 1)) ∈ ℕ) → ((𝐹‘𝑛) < (𝐹‘(𝑛 + 1)) ↔ ((𝐹‘𝑛) + 1) ≤ (𝐹‘(𝑛 + 1))))
44	19, 42, 43	syl2anc 691	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ) → ((𝐹‘𝑛) < (𝐹‘(𝑛 + 1)) ↔ ((𝐹‘𝑛) + 1) ≤ (𝐹‘(𝑛 + 1))))
45	44	biimpa 500	. . . . . . . . . . . . . . . 16 ⊢ (((𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ) ∧ (𝐹‘𝑛) < (𝐹‘(𝑛 + 1))) → ((𝐹‘𝑛) + 1) ≤ (𝐹‘(𝑛 + 1)))
46	45	anasss 677	. . . . . . . . . . . . . . 15 ⊢ ((𝐹:ℕ⟶ℕ ∧ (𝑛 ∈ ℕ ∧ (𝐹‘𝑛) < (𝐹‘(𝑛 + 1)))) → ((𝐹‘𝑛) + 1) ≤ (𝐹‘(𝑛 + 1)))
47	40, 46	sylan2 490	. . . . . . . . . . . . . 14 ⊢ ((𝐹:ℕ⟶ℕ ∧ (𝑛 ∈ ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) → ((𝐹‘𝑛) + 1) ≤ (𝐹‘(𝑛 + 1)))
48	47	anass1rs 845	. . . . . . . . . . . . 13 ⊢ (((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) ∧ 𝑛 ∈ ℕ) → ((𝐹‘𝑛) + 1) ≤ (𝐹‘(𝑛 + 1)))
49	48	adantll 746	. . . . . . . . . . . 12 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → ((𝐹‘𝑛) + 1) ≤ (𝐹‘(𝑛 + 1)))
50		peano2re 10088	. . . . . . . . . . . . . . . 16 ⊢ (𝑞 ∈ ℝ → (𝑞 + 1) ∈ ℝ)
51	28, 50	syl 17	. . . . . . . . . . . . . . 15 ⊢ (𝑞 ∈ ℕ → (𝑞 + 1) ∈ ℝ)
52	51	ad2antrr 758	. . . . . . . . . . . . . 14 ⊢ (((𝑞 ∈ ℕ ∧ 𝐹:ℕ⟶ℕ) ∧ 𝑛 ∈ ℕ) → (𝑞 + 1) ∈ ℝ)
53		peano2nn 10909	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐹‘𝑛) ∈ ℕ → ((𝐹‘𝑛) + 1) ∈ ℕ)
54	19, 53	syl 17	. . . . . . . . . . . . . . . 16 ⊢ ((𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ) → ((𝐹‘𝑛) + 1) ∈ ℕ)
55	54	nnred 10912	. . . . . . . . . . . . . . 15 ⊢ ((𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ) → ((𝐹‘𝑛) + 1) ∈ ℝ)
56	55	adantll 746	. . . . . . . . . . . . . 14 ⊢ (((𝑞 ∈ ℕ ∧ 𝐹:ℕ⟶ℕ) ∧ 𝑛 ∈ ℕ) → ((𝐹‘𝑛) + 1) ∈ ℝ)
57	41	nnred 10912	. . . . . . . . . . . . . . . 16 ⊢ ((𝐹:ℕ⟶ℕ ∧ (𝑛 + 1) ∈ ℕ) → (𝐹‘(𝑛 + 1)) ∈ ℝ)
58	26, 57	sylan2 490	. . . . . . . . . . . . . . 15 ⊢ ((𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ) → (𝐹‘(𝑛 + 1)) ∈ ℝ)
59	58	adantll 746	. . . . . . . . . . . . . 14 ⊢ (((𝑞 ∈ ℕ ∧ 𝐹:ℕ⟶ℕ) ∧ 𝑛 ∈ ℕ) → (𝐹‘(𝑛 + 1)) ∈ ℝ)
60		letr 10010	. . . . . . . . . . . . . 14 ⊢ (((𝑞 + 1) ∈ ℝ ∧ ((𝐹‘𝑛) + 1) ∈ ℝ ∧ (𝐹‘(𝑛 + 1)) ∈ ℝ) → (((𝑞 + 1) ≤ ((𝐹‘𝑛) + 1) ∧ ((𝐹‘𝑛) + 1) ≤ (𝐹‘(𝑛 + 1))) → (𝑞 + 1) ≤ (𝐹‘(𝑛 + 1))))
61	52, 56, 59, 60	syl3anc 1318	. . . . . . . . . . . . 13 ⊢ (((𝑞 ∈ ℕ ∧ 𝐹:ℕ⟶ℕ) ∧ 𝑛 ∈ ℕ) → (((𝑞 + 1) ≤ ((𝐹‘𝑛) + 1) ∧ ((𝐹‘𝑛) + 1) ≤ (𝐹‘(𝑛 + 1))) → (𝑞 + 1) ≤ (𝐹‘(𝑛 + 1))))
62	61	adantlrr 753	. . . . . . . . . . . 12 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → (((𝑞 + 1) ≤ ((𝐹‘𝑛) + 1) ∧ ((𝐹‘𝑛) + 1) ≤ (𝐹‘(𝑛 + 1))) → (𝑞 + 1) ≤ (𝐹‘(𝑛 + 1))))
63	49, 62	mpan2d 706	. . . . . . . . . . 11 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → ((𝑞 + 1) ≤ ((𝐹‘𝑛) + 1) → (𝑞 + 1) ≤ (𝐹‘(𝑛 + 1))))
64	34, 63	sylbid 229	. . . . . . . . . 10 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → (𝑞 ≤ (𝐹‘𝑛) → (𝑞 + 1) ≤ (𝐹‘(𝑛 + 1))))
65		nnz 11276	. . . . . . . . . . . . 13 ⊢ (𝑞 ∈ ℕ → 𝑞 ∈ ℤ)
66	19	nnzd 11357	. . . . . . . . . . . . 13 ⊢ ((𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ) → (𝐹‘𝑛) ∈ ℤ)
67		eluz 11577	. . . . . . . . . . . . 13 ⊢ ((𝑞 ∈ ℤ ∧ (𝐹‘𝑛) ∈ ℤ) → ((𝐹‘𝑛) ∈ (ℤ_≥‘𝑞) ↔ 𝑞 ≤ (𝐹‘𝑛)))
68	65, 66, 67	syl2an 493	. . . . . . . . . . . 12 ⊢ ((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ)) → ((𝐹‘𝑛) ∈ (ℤ_≥‘𝑞) ↔ 𝑞 ≤ (𝐹‘𝑛)))
69	68	adantrlr 755	. . . . . . . . . . 11 ⊢ ((𝑞 ∈ ℕ ∧ ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) ∧ 𝑛 ∈ ℕ)) → ((𝐹‘𝑛) ∈ (ℤ_≥‘𝑞) ↔ 𝑞 ≤ (𝐹‘𝑛)))
70	69	anassrs 678	. . . . . . . . . 10 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → ((𝐹‘𝑛) ∈ (ℤ_≥‘𝑞) ↔ 𝑞 ≤ (𝐹‘𝑛)))
71	65	peano2zd 11361	. . . . . . . . . . . . 13 ⊢ (𝑞 ∈ ℕ → (𝑞 + 1) ∈ ℤ)
72	41	nnzd 11357	. . . . . . . . . . . . . 14 ⊢ ((𝐹:ℕ⟶ℕ ∧ (𝑛 + 1) ∈ ℕ) → (𝐹‘(𝑛 + 1)) ∈ ℤ)
73	26, 72	sylan2 490	. . . . . . . . . . . . 13 ⊢ ((𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ) → (𝐹‘(𝑛 + 1)) ∈ ℤ)
74		eluz 11577	. . . . . . . . . . . . 13 ⊢ (((𝑞 + 1) ∈ ℤ ∧ (𝐹‘(𝑛 + 1)) ∈ ℤ) → ((𝐹‘(𝑛 + 1)) ∈ (ℤ_≥‘(𝑞 + 1)) ↔ (𝑞 + 1) ≤ (𝐹‘(𝑛 + 1))))
75	71, 73, 74	syl2an 493	. . . . . . . . . . . 12 ⊢ ((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ 𝑛 ∈ ℕ)) → ((𝐹‘(𝑛 + 1)) ∈ (ℤ_≥‘(𝑞 + 1)) ↔ (𝑞 + 1) ≤ (𝐹‘(𝑛 + 1))))
76	75	adantrlr 755	. . . . . . . . . . 11 ⊢ ((𝑞 ∈ ℕ ∧ ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) ∧ 𝑛 ∈ ℕ)) → ((𝐹‘(𝑛 + 1)) ∈ (ℤ_≥‘(𝑞 + 1)) ↔ (𝑞 + 1) ≤ (𝐹‘(𝑛 + 1))))
77	76	anassrs 678	. . . . . . . . . 10 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → ((𝐹‘(𝑛 + 1)) ∈ (ℤ_≥‘(𝑞 + 1)) ↔ (𝑞 + 1) ≤ (𝐹‘(𝑛 + 1))))
78	64, 70, 77	3imtr4d 282	. . . . . . . . 9 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → ((𝐹‘𝑛) ∈ (ℤ_≥‘𝑞) → (𝐹‘(𝑛 + 1)) ∈ (ℤ_≥‘(𝑞 + 1))))
79		fveq2 6103	. . . . . . . . . . 11 ⊢ (𝑘 = (𝑛 + 1) → (𝐹‘𝑘) = (𝐹‘(𝑛 + 1)))
80	79	eleq1d 2672	. . . . . . . . . 10 ⊢ (𝑘 = (𝑛 + 1) → ((𝐹‘𝑘) ∈ (ℤ_≥‘(𝑞 + 1)) ↔ (𝐹‘(𝑛 + 1)) ∈ (ℤ_≥‘(𝑞 + 1))))
81	80	rspcev 3282	. . . . . . . . 9 ⊢ (((𝑛 + 1) ∈ ℕ ∧ (𝐹‘(𝑛 + 1)) ∈ (ℤ_≥‘(𝑞 + 1))) → ∃𝑘 ∈ ℕ (𝐹‘𝑘) ∈ (ℤ_≥‘(𝑞 + 1)))
82	27, 78, 81	syl6an 566	. . . . . . . 8 ⊢ (((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) ∧ 𝑛 ∈ ℕ) → ((𝐹‘𝑛) ∈ (ℤ_≥‘𝑞) → ∃𝑘 ∈ ℕ (𝐹‘𝑘) ∈ (ℤ_≥‘(𝑞 + 1))))
83	82	rexlimdva 3013	. . . . . . 7 ⊢ ((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) → (∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑞) → ∃𝑘 ∈ ℕ (𝐹‘𝑘) ∈ (ℤ_≥‘(𝑞 + 1))))
84		fveq2 6103	. . . . . . . . 9 ⊢ (𝑘 = 𝑛 → (𝐹‘𝑘) = (𝐹‘𝑛))
85	84	eleq1d 2672	. . . . . . . 8 ⊢ (𝑘 = 𝑛 → ((𝐹‘𝑘) ∈ (ℤ_≥‘(𝑞 + 1)) ↔ (𝐹‘𝑛) ∈ (ℤ_≥‘(𝑞 + 1))))
86	85	cbvrexv 3148	. . . . . . 7 ⊢ (∃𝑘 ∈ ℕ (𝐹‘𝑘) ∈ (ℤ_≥‘(𝑞 + 1)) ↔ ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘(𝑞 + 1)))
87	83, 86	syl6ib 240	. . . . . 6 ⊢ ((𝑞 ∈ ℕ ∧ (𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)))) → (∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑞) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘(𝑞 + 1))))
88	87	ex 449	. . . . 5 ⊢ (𝑞 ∈ ℕ → ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → (∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑞) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘(𝑞 + 1)))))
89	88	a2d 29	. . . 4 ⊢ (𝑞 ∈ ℕ → (((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝑞)) → ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘(𝑞 + 1)))))
90	4, 8, 12, 16, 25, 89	nnind 10915	. . 3 ⊢ (𝐴 ∈ ℕ → ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝐴)))
91	90	com12 32	. 2 ⊢ ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1))) → (𝐴 ∈ ℕ → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝐴)))
92	91	3impia 1253	1 ⊢ ((𝐹:ℕ⟶ℕ ∧ ∀𝑚 ∈ ℕ (𝐹‘𝑚) < (𝐹‘(𝑚 + 1)) ∧ 𝐴 ∈ ℕ) → ∃𝑛 ∈ ℕ (𝐹‘𝑛) ∈ (ℤ_≥‘𝐴))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 ∧ w3a 1031 = wceq 1475 ∈ wcel 1977 ≠ wne 2780 ∀wral 2896 ∃wrex 2897 ∅c0 3874 class class class wbr 4583 ⟶wf 5800 ‘cfv 5804 (class class class)co 6549 ℝcr 9814 1c1 9816 + caddc 9818 < clt 9953 ≤ cle 9954 ℕcn 10897 ℤcz 11254 ℤ_≥cuz 11563

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-cnex 9871 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 ax-pre-mulgt0 9892

This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-iun 4457 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-om 6958 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-er 7629 df-en 7842 df-dom 7843 df-sdom 7844 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-nn 10898 df-n0 11170 df-z 11255 df-uz 11564

This theorem is referenced by: incsequz2 32715

W3C validator