xrralrecnnge - Mathbox for Glauco Siliprandi

	Mathbox for Glauco Siliprandi		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > Mathboxes > xrralrecnnge		Structured version Visualization version GIF version

Theorem xrralrecnnge 45359

Description: Show that 𝐴 is less than 𝐵 by showing that there is no positive bound on the difference. (Contributed by Glauco Siliprandi, 26-Jun-2021.)

**Hypotheses**
Ref	Expression
xrralrecnnge.n	⊢ Ⅎ𝑛𝜑
xrralrecnnge.a	⊢ (𝜑 → 𝐴 ∈ ℝ)
xrralrecnnge.b	⊢ (𝜑 → 𝐵 ∈ ℝ^*)

**Assertion**
Ref	Expression
xrralrecnnge	⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵))

Distinct variable groups: 𝐴,𝑛 𝐵,𝑛 Allowed substitution hint: 𝜑(𝑛)

**Proof of Theorem xrralrecnnge**
Step	Hyp	Ref	Expression
1		xrralrecnnge.n	. . . . 5 ⊢ Ⅎ𝑛𝜑
2		nfv 1914	. . . . 5 ⊢ Ⅎ𝑛 𝐴 ≤ 𝐵
3	1, 2	nfan 1899	. . . 4 ⊢ Ⅎ𝑛(𝜑 ∧ 𝐴 ≤ 𝐵)
4		xrralrecnnge.a	. . . . . . . . . 10 ⊢ (𝜑 → 𝐴 ∈ ℝ)
5	4	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ ℝ)
6		nnrecre 12204	. . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (1 / 𝑛) ∈ ℝ)
7	6	adantl 481	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈ ℝ)
8	5, 7	resubcld 11582	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ∈ ℝ)
9	8	rexrd 11200	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ∈ ℝ^*)
10	9	adantlr 715	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ∈ ℝ^*)
11		xrralrecnnge.b	. . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
12	11	ad2antrr 726	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐵 ∈ ℝ^*)
13	4	rexrd 11200	. . . . . . . 8 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
14	13	ad2antrr 726	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ ℝ^*)
15		nnrp 12939	. . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℝ⁺)
16	15	rpreccld 12981	. . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (1 / 𝑛) ∈ ℝ⁺)
17	16	adantl 481	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈ ℝ⁺)
18	5, 17	ltsubrpd 13003	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) < 𝐴)
19	18	adantlr 715	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) < 𝐴)
20		simplr 768	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐴 ≤ 𝐵)
21	10, 14, 12, 19, 20	xrltletrd 13097	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) < 𝐵)
22	10, 12, 21	xrltled 13086	. . . . 5 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ≤ 𝐵)
23	22	ex 412	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → (𝑛 ∈ ℕ → (𝐴 − (1 / 𝑛)) ≤ 𝐵))
24	3, 23	ralrimi 3233	. . 3 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵)
25	24	ex 412	. 2 ⊢ (𝜑 → (𝐴 ≤ 𝐵 → ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵))
26		pnfxr 11204	. . . . . . . 8 ⊢ +∞ ∈ ℝ^*
27	26	a1i 11	. . . . . . 7 ⊢ (𝜑 → +∞ ∈ ℝ^*)
28	4	ltpnfd 13057	. . . . . . 7 ⊢ (𝜑 → 𝐴 < +∞)
29	13, 27, 28	xrltled 13086	. . . . . 6 ⊢ (𝜑 → 𝐴 ≤ +∞)
30	29	ad2antrr 726	. . . . 5 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = +∞) → 𝐴 ≤ +∞)
31		id 22	. . . . . . 7 ⊢ (𝐵 = +∞ → 𝐵 = +∞)
32	31	eqcomd 2735	. . . . . 6 ⊢ (𝐵 = +∞ → +∞ = 𝐵)
33	32	adantl 481	. . . . 5 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = +∞) → +∞ = 𝐵)
34	30, 33	breqtrd 5128	. . . 4 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = +∞) → 𝐴 ≤ 𝐵)
35	11	ad2antrr 726	. . . . . 6 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ∈ ℝ^*)
36		1nn 12173	. . . . . . . . . . . . . 14 ⊢ 1 ∈ ℕ
37	36	a1i 11	. . . . . . . . . . . . 13 ⊢ (∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 → 1 ∈ ℕ)
38		id 22	. . . . . . . . . . . . 13 ⊢ (∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 → ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵)
39		oveq2 7377	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 = 1 → (1 / 𝑛) = (1 / 1))
40	39	oveq2d 7385	. . . . . . . . . . . . . . 15 ⊢ (𝑛 = 1 → (𝐴 − (1 / 𝑛)) = (𝐴 − (1 / 1)))
41	40	breq1d 5112	. . . . . . . . . . . . . 14 ⊢ (𝑛 = 1 → ((𝐴 − (1 / 𝑛)) ≤ 𝐵 ↔ (𝐴 − (1 / 1)) ≤ 𝐵))
42	41	rspcva 3583	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℕ ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → (𝐴 − (1 / 1)) ≤ 𝐵)
43	37, 38, 42	syl2anc 584	. . . . . . . . . . . 12 ⊢ (∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 → (𝐴 − (1 / 1)) ≤ 𝐵)
44	43	adantr 480	. . . . . . . . . . 11 ⊢ ((∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 ∧ 𝐵 = -∞) → (𝐴 − (1 / 1)) ≤ 𝐵)
45		simpr 484	. . . . . . . . . . 11 ⊢ ((∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 ∧ 𝐵 = -∞) → 𝐵 = -∞)
46	44, 45	breqtrd 5128	. . . . . . . . . 10 ⊢ ((∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 ∧ 𝐵 = -∞) → (𝐴 − (1 / 1)) ≤ -∞)
47	46	adantll 714	. . . . . . . . 9 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = -∞) → (𝐴 − (1 / 1)) ≤ -∞)
48		1red 11151	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 1 ∈ ℝ)
49		ax-1ne0 11113	. . . . . . . . . . . . . . 15 ⊢ 1 ≠ 0
50	49	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 1 ≠ 0)
51	48, 48, 50	redivcld 11986	. . . . . . . . . . . . 13 ⊢ (𝜑 → (1 / 1) ∈ ℝ)
52	4, 51	resubcld 11582	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 − (1 / 1)) ∈ ℝ)
53	52	mnfltd 13060	. . . . . . . . . . 11 ⊢ (𝜑 → -∞ < (𝐴 − (1 / 1)))
54		mnfxr 11207	. . . . . . . . . . . . 13 ⊢ -∞ ∈ ℝ^*
55	54	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → -∞ ∈ ℝ^*)
56	52	rexrd 11200	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 − (1 / 1)) ∈ ℝ^*)
57	55, 56	xrltnled 45332	. . . . . . . . . . 11 ⊢ (𝜑 → (-∞ < (𝐴 − (1 / 1)) ↔ ¬ (𝐴 − (1 / 1)) ≤ -∞))
58	53, 57	mpbid 232	. . . . . . . . . 10 ⊢ (𝜑 → ¬ (𝐴 − (1 / 1)) ≤ -∞)
59	58	ad2antrr 726	. . . . . . . . 9 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = -∞) → ¬ (𝐴 − (1 / 1)) ≤ -∞)
60	47, 59	pm2.65da 816	. . . . . . . 8 ⊢ ((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → ¬ 𝐵 = -∞)
61	60	neqned 2932	. . . . . . 7 ⊢ ((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → 𝐵 ≠ -∞)
62	61	adantr 480	. . . . . 6 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ≠ -∞)
63		neqne 2933	. . . . . . 7 ⊢ (¬ 𝐵 = +∞ → 𝐵 ≠ +∞)
64	63	adantl 481	. . . . . 6 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ≠ +∞)
65	35, 62, 64	xrred 45334	. . . . 5 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ∈ ℝ)
66		nfv 1914	. . . . . . . . . . 11 ⊢ Ⅎ𝑛 𝐵 ∈ ℝ
67	1, 66	nfan 1899	. . . . . . . . . 10 ⊢ Ⅎ𝑛(𝜑 ∧ 𝐵 ∈ ℝ)
68	13	adantr 480	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → 𝐴 ∈ ℝ^*)
69		simpr 484	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → 𝐵 ∈ ℝ)
70	67, 68, 69	xrralrecnnle 45352	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ ∀𝑛 ∈ ℕ 𝐴 ≤ (𝐵 + (1 / 𝑛))))
71	5	adantlr 715	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ ℝ)
72	6	adantl 481	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈ ℝ)
73	69	adantr 480	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → 𝐵 ∈ ℝ)
74	71, 72, 73	lesubaddd 11751	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → ((𝐴 − (1 / 𝑛)) ≤ 𝐵 ↔ 𝐴 ≤ (𝐵 + (1 / 𝑛))))
75	74	bicomd 223	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → (𝐴 ≤ (𝐵 + (1 / 𝑛)) ↔ (𝐴 − (1 / 𝑛)) ≤ 𝐵))
76	67, 75	ralbida 3246	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → (∀𝑛 ∈ ℕ 𝐴 ≤ (𝐵 + (1 / 𝑛)) ↔ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵))
77	70, 76	bitr2d 280	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → (∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 ↔ 𝐴 ≤ 𝐵))
78	77	biimpd 229	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → (∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 → 𝐴 ≤ 𝐵))
79	78	imp 406	. . . . . 6 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → 𝐴 ≤ 𝐵)
80	79	an32s 652	. . . . 5 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 ∈ ℝ) → 𝐴 ≤ 𝐵)
81	65, 80	syldan 591	. . . 4 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐴 ≤ 𝐵)
82	34, 81	pm2.61dan 812	. . 3 ⊢ ((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → 𝐴 ≤ 𝐵)
83	82	ex 412	. 2 ⊢ (𝜑 → (∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 → 𝐴 ≤ 𝐵))
84	25, 83	impbid 212	1 ⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1540 Ⅎwnf 1783 ∈ wcel 2109 ≠ wne 2925 ∀wral 3044 class class class wbr 5102 (class class class)co 7369 ℝcr 11043 0cc0 11044 1c1 11045 + caddc 11047 +∞cpnf 11181 -∞cmnf 11182 ℝ^*cxr 11183 < clt 11184 ≤ cle 11185 − cmin 11381 / cdiv 11811 ℕcn 12162 ℝ⁺crp 12927

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5246 ax-nul 5256 ax-pow 5315 ax-pr 5382 ax-un 7691 ax-cnex 11100 ax-resscn 11101 ax-1cn 11102 ax-icn 11103 ax-addcl 11104 ax-addrcl 11105 ax-mulcl 11106 ax-mulrcl 11107 ax-mulcom 11108 ax-addass 11109 ax-mulass 11110 ax-distr 11111 ax-i2m1 11112 ax-1ne0 11113 ax-1rid 11114 ax-rnegex 11115 ax-rrecex 11116 ax-cnre 11117 ax-pre-lttri 11118 ax-pre-lttrn 11119 ax-pre-ltadd 11120 ax-pre-mulgt0 11121 ax-pre-sup 11122

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3351 df-reu 3352 df-rab 3403 df-v 3446 df-sbc 3751 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3931 df-nul 4293 df-if 4485 df-pw 4561 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-iun 4953 df-br 5103 df-opab 5165 df-mpt 5184 df-tr 5210 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6262 df-ord 6323 df-on 6324 df-lim 6325 df-suc 6326 df-iota 6452 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-riota 7326 df-ov 7372 df-oprab 7373 df-mpo 7374 df-om 7823 df-1st 7947 df-2nd 7948 df-frecs 8237 df-wrecs 8268 df-recs 8317 df-rdg 8355 df-er 8648 df-en 8896 df-dom 8897 df-sdom 8898 df-sup 9369 df-inf 9370 df-pnf 11186 df-mnf 11187 df-xr 11188 df-ltxr 11189 df-le 11190 df-sub 11383 df-neg 11384 df-div 11812 df-nn 12163 df-n0 12419 df-z 12506 df-uz 12770 df-q 12884 df-rp 12928 df-fl 13730

This theorem is referenced by: preimageiingt 46691

W3C validator