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 42930

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 1917	. . . . 5 ⊢ Ⅎ𝑛 𝐴 ≤ 𝐵
3	1, 2	nfan 1902	. . . 4 ⊢ Ⅎ𝑛(𝜑 ∧ 𝐴 ≤ 𝐵)
4		xrralrecnnge.a	. . . . . . . . . 10 ⊢ (𝜑 → 𝐴 ∈ ℝ)
5	4	adantr 481	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ ℝ)
6		nnrecre 12015	. . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (1 / 𝑛) ∈ ℝ)
7	6	adantl 482	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈ ℝ)
8	5, 7	resubcld 11403	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ∈ ℝ)
9	8	rexrd 11025	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ∈ ℝ^*)
10	9	adantlr 712	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ∈ ℝ^*)
11		xrralrecnnge.b	. . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
12	11	ad2antrr 723	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐵 ∈ ℝ^*)
13	4	rexrd 11025	. . . . . . . 8 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
14	13	ad2antrr 723	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ ℝ^*)
15		nnrp 12741	. . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℝ⁺)
16	15	rpreccld 12782	. . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (1 / 𝑛) ∈ ℝ⁺)
17	16	adantl 482	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈ ℝ⁺)
18	5, 17	ltsubrpd 12804	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) < 𝐴)
19	18	adantlr 712	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) < 𝐴)
20		simplr 766	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐴 ≤ 𝐵)
21	10, 14, 12, 19, 20	xrltletrd 12895	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) < 𝐵)
22	10, 12, 21	xrltled 12884	. . . . 5 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ≤ 𝐵)
23	22	ex 413	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → (𝑛 ∈ ℕ → (𝐴 − (1 / 𝑛)) ≤ 𝐵))
24	3, 23	ralrimi 3141	. . 3 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵)
25	24	ex 413	. 2 ⊢ (𝜑 → (𝐴 ≤ 𝐵 → ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵))
26		pnfxr 11029	. . . . . . . 8 ⊢ +∞ ∈ ℝ^*
27	26	a1i 11	. . . . . . 7 ⊢ (𝜑 → +∞ ∈ ℝ^*)
28	4	ltpnfd 12857	. . . . . . 7 ⊢ (𝜑 → 𝐴 < +∞)
29	13, 27, 28	xrltled 12884	. . . . . 6 ⊢ (𝜑 → 𝐴 ≤ +∞)
30	29	ad2antrr 723	. . . . 5 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = +∞) → 𝐴 ≤ +∞)
31		id 22	. . . . . . 7 ⊢ (𝐵 = +∞ → 𝐵 = +∞)
32	31	eqcomd 2744	. . . . . 6 ⊢ (𝐵 = +∞ → +∞ = 𝐵)
33	32	adantl 482	. . . . 5 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = +∞) → +∞ = 𝐵)
34	30, 33	breqtrd 5100	. . . 4 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = +∞) → 𝐴 ≤ 𝐵)
35	11	ad2antrr 723	. . . . . 6 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ∈ ℝ^*)
36		1nn 11984	. . . . . . . . . . . . . 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 7283	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 = 1 → (1 / 𝑛) = (1 / 1))
40	39	oveq2d 7291	. . . . . . . . . . . . . . 15 ⊢ (𝑛 = 1 → (𝐴 − (1 / 𝑛)) = (𝐴 − (1 / 1)))
41	40	breq1d 5084	. . . . . . . . . . . . . 14 ⊢ (𝑛 = 1 → ((𝐴 − (1 / 𝑛)) ≤ 𝐵 ↔ (𝐴 − (1 / 1)) ≤ 𝐵))
42	41	rspcva 3559	. . . . . . . . . . . . 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 481	. . . . . . . . . . 11 ⊢ ((∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 ∧ 𝐵 = -∞) → (𝐴 − (1 / 1)) ≤ 𝐵)
45		simpr 485	. . . . . . . . . . 11 ⊢ ((∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 ∧ 𝐵 = -∞) → 𝐵 = -∞)
46	44, 45	breqtrd 5100	. . . . . . . . . 10 ⊢ ((∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 ∧ 𝐵 = -∞) → (𝐴 − (1 / 1)) ≤ -∞)
47	46	adantll 711	. . . . . . . . 9 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = -∞) → (𝐴 − (1 / 1)) ≤ -∞)
48		1red 10976	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 1 ∈ ℝ)
49		ax-1ne0 10940	. . . . . . . . . . . . . . 15 ⊢ 1 ≠ 0
50	49	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 1 ≠ 0)
51	48, 48, 50	redivcld 11803	. . . . . . . . . . . . 13 ⊢ (𝜑 → (1 / 1) ∈ ℝ)
52	4, 51	resubcld 11403	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 − (1 / 1)) ∈ ℝ)
53	52	mnfltd 12860	. . . . . . . . . . 11 ⊢ (𝜑 → -∞ < (𝐴 − (1 / 1)))
54		mnfxr 11032	. . . . . . . . . . . . 13 ⊢ -∞ ∈ ℝ^*
55	54	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → -∞ ∈ ℝ^*)
56	52	rexrd 11025	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 − (1 / 1)) ∈ ℝ^*)
57	55, 56	xrltnled 42902	. . . . . . . . . . 11 ⊢ (𝜑 → (-∞ < (𝐴 − (1 / 1)) ↔ ¬ (𝐴 − (1 / 1)) ≤ -∞))
58	53, 57	mpbid 231	. . . . . . . . . 10 ⊢ (𝜑 → ¬ (𝐴 − (1 / 1)) ≤ -∞)
59	58	ad2antrr 723	. . . . . . . . 9 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = -∞) → ¬ (𝐴 − (1 / 1)) ≤ -∞)
60	47, 59	pm2.65da 814	. . . . . . . 8 ⊢ ((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → ¬ 𝐵 = -∞)
61	60	neqned 2950	. . . . . . 7 ⊢ ((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → 𝐵 ≠ -∞)
62	61	adantr 481	. . . . . 6 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ≠ -∞)
63		neqne 2951	. . . . . . 7 ⊢ (¬ 𝐵 = +∞ → 𝐵 ≠ +∞)
64	63	adantl 482	. . . . . 6 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ≠ +∞)
65	35, 62, 64	xrred 42904	. . . . 5 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ∈ ℝ)
66		nfv 1917	. . . . . . . . . . 11 ⊢ Ⅎ𝑛 𝐵 ∈ ℝ
67	1, 66	nfan 1902	. . . . . . . . . 10 ⊢ Ⅎ𝑛(𝜑 ∧ 𝐵 ∈ ℝ)
68	13	adantr 481	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → 𝐴 ∈ ℝ^*)
69		simpr 485	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → 𝐵 ∈ ℝ)
70	67, 68, 69	xrralrecnnle 42922	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ ∀𝑛 ∈ ℕ 𝐴 ≤ (𝐵 + (1 / 𝑛))))
71	5	adantlr 712	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ ℝ)
72	6	adantl 482	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈ ℝ)
73	69	adantr 481	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → 𝐵 ∈ ℝ)
74	71, 72, 73	lesubaddd 11572	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → ((𝐴 − (1 / 𝑛)) ≤ 𝐵 ↔ 𝐴 ≤ (𝐵 + (1 / 𝑛))))
75	74	bicomd 222	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → (𝐴 ≤ (𝐵 + (1 / 𝑛)) ↔ (𝐴 − (1 / 𝑛)) ≤ 𝐵))
76	67, 75	ralbida 3159	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → (∀𝑛 ∈ ℕ 𝐴 ≤ (𝐵 + (1 / 𝑛)) ↔ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵))
77	70, 76	bitr2d 279	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → (∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 ↔ 𝐴 ≤ 𝐵))
78	77	biimpd 228	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → (∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 → 𝐴 ≤ 𝐵))
79	78	imp 407	. . . . . 6 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → 𝐴 ≤ 𝐵)
80	79	an32s 649	. . . . 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 810	. . 3 ⊢ ((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → 𝐴 ≤ 𝐵)
83	82	ex 413	. 2 ⊢ (𝜑 → (∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 → 𝐴 ≤ 𝐵))
84	25, 83	impbid 211	1 ⊢ (𝜑 → (𝐴 ≤ 𝐵 ↔ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1539 Ⅎwnf 1786 ∈ wcel 2106 ≠ wne 2943 ∀wral 3064 class class class wbr 5074 (class class class)co 7275 ℝcr 10870 0cc0 10871 1c1 10872 + caddc 10874 +∞cpnf 11006 -∞cmnf 11007 ℝ^*cxr 11008 < clt 11009 ≤ cle 11010 − cmin 11205 / cdiv 11632 ℕcn 11973 ℝ⁺crp 12730

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 ax-pre-sup 10949

This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-1st 7831 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-er 8498 df-en 8734 df-dom 8735 df-sdom 8736 df-sup 9201 df-inf 9202 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-div 11633 df-nn 11974 df-n0 12234 df-z 12320 df-uz 12583 df-q 12689 df-rp 12731 df-fl 13512

This theorem is referenced by: preimageiingt 44257

W3C validator