xrralrecnnge - Mathbox for Glauco Siliprandi

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Theorem xrralrecnnge 45075

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 1910	. . . . 5 ⊢ Ⅎ𝑛 𝐴 ≤ 𝐵
3	1, 2	nfan 1895	. . . 4 ⊢ Ⅎ𝑛(𝜑 ∧ 𝐴 ≤ 𝐵)
4		xrralrecnnge.a	. . . . . . . . . 10 ⊢ (𝜑 → 𝐴 ∈ ℝ)
5	4	adantr 479	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ ℝ)
6		nnrecre 12316	. . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (1 / 𝑛) ∈ ℝ)
7	6	adantl 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈ ℝ)
8	5, 7	resubcld 11699	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ∈ ℝ)
9	8	rexrd 11321	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ∈ ℝ^*)
10	9	adantlr 713	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ∈ ℝ^*)
11		xrralrecnnge.b	. . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
12	11	ad2antrr 724	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐵 ∈ ℝ^*)
13	4	rexrd 11321	. . . . . . . 8 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
14	13	ad2antrr 724	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ ℝ^*)
15		nnrp 13049	. . . . . . . . . . 11 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℝ⁺)
16	15	rpreccld 13090	. . . . . . . . . 10 ⊢ (𝑛 ∈ ℕ → (1 / 𝑛) ∈ ℝ⁺)
17	16	adantl 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈ ℝ⁺)
18	5, 17	ltsubrpd 13112	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) < 𝐴)
19	18	adantlr 713	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) < 𝐴)
20		simplr 767	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐴 ≤ 𝐵)
21	10, 14, 12, 19, 20	xrltletrd 13204	. . . . . 6 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) < 𝐵)
22	10, 12, 21	xrltled 13193	. . . . 5 ⊢ (((𝜑 ∧ 𝐴 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐴 − (1 / 𝑛)) ≤ 𝐵)
23	22	ex 411	. . . 4 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → (𝑛 ∈ ℕ → (𝐴 − (1 / 𝑛)) ≤ 𝐵))
24	3, 23	ralrimi 3249	. . 3 ⊢ ((𝜑 ∧ 𝐴 ≤ 𝐵) → ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵)
25	24	ex 411	. 2 ⊢ (𝜑 → (𝐴 ≤ 𝐵 → ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵))
26		pnfxr 11325	. . . . . . . 8 ⊢ +∞ ∈ ℝ^*
27	26	a1i 11	. . . . . . 7 ⊢ (𝜑 → +∞ ∈ ℝ^*)
28	4	ltpnfd 13165	. . . . . . 7 ⊢ (𝜑 → 𝐴 < +∞)
29	13, 27, 28	xrltled 13193	. . . . . 6 ⊢ (𝜑 → 𝐴 ≤ +∞)
30	29	ad2antrr 724	. . . . 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 480	. . . . 5 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = +∞) → +∞ = 𝐵)
34	30, 33	breqtrd 5182	. . . 4 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = +∞) → 𝐴 ≤ 𝐵)
35	11	ad2antrr 724	. . . . . 6 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ∈ ℝ^*)
36		1nn 12285	. . . . . . . . . . . . . 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 7438	. . . . . . . . . . . . . . . 16 ⊢ (𝑛 = 1 → (1 / 𝑛) = (1 / 1))
40	39	oveq2d 7446	. . . . . . . . . . . . . . 15 ⊢ (𝑛 = 1 → (𝐴 − (1 / 𝑛)) = (𝐴 − (1 / 1)))
41	40	breq1d 5166	. . . . . . . . . . . . . 14 ⊢ (𝑛 = 1 → ((𝐴 − (1 / 𝑛)) ≤ 𝐵 ↔ (𝐴 − (1 / 1)) ≤ 𝐵))
42	41	rspcva 3618	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℕ ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → (𝐴 − (1 / 1)) ≤ 𝐵)
43	37, 38, 42	syl2anc 582	. . . . . . . . . . . 12 ⊢ (∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 → (𝐴 − (1 / 1)) ≤ 𝐵)
44	43	adantr 479	. . . . . . . . . . 11 ⊢ ((∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 ∧ 𝐵 = -∞) → (𝐴 − (1 / 1)) ≤ 𝐵)
45		simpr 483	. . . . . . . . . . 11 ⊢ ((∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 ∧ 𝐵 = -∞) → 𝐵 = -∞)
46	44, 45	breqtrd 5182	. . . . . . . . . 10 ⊢ ((∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵 ∧ 𝐵 = -∞) → (𝐴 − (1 / 1)) ≤ -∞)
47	46	adantll 712	. . . . . . . . 9 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = -∞) → (𝐴 − (1 / 1)) ≤ -∞)
48		1red 11272	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 1 ∈ ℝ)
49		ax-1ne0 11234	. . . . . . . . . . . . . . 15 ⊢ 1 ≠ 0
50	49	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 1 ≠ 0)
51	48, 48, 50	redivcld 12103	. . . . . . . . . . . . 13 ⊢ (𝜑 → (1 / 1) ∈ ℝ)
52	4, 51	resubcld 11699	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 − (1 / 1)) ∈ ℝ)
53	52	mnfltd 13168	. . . . . . . . . . 11 ⊢ (𝜑 → -∞ < (𝐴 − (1 / 1)))
54		mnfxr 11328	. . . . . . . . . . . . 13 ⊢ -∞ ∈ ℝ^*
55	54	a1i 11	. . . . . . . . . . . 12 ⊢ (𝜑 → -∞ ∈ ℝ^*)
56	52	rexrd 11321	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐴 − (1 / 1)) ∈ ℝ^*)
57	55, 56	xrltnled 45048	. . . . . . . . . . 11 ⊢ (𝜑 → (-∞ < (𝐴 − (1 / 1)) ↔ ¬ (𝐴 − (1 / 1)) ≤ -∞))
58	53, 57	mpbid 231	. . . . . . . . . 10 ⊢ (𝜑 → ¬ (𝐴 − (1 / 1)) ≤ -∞)
59	58	ad2antrr 724	. . . . . . . . 9 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 = -∞) → ¬ (𝐴 − (1 / 1)) ≤ -∞)
60	47, 59	pm2.65da 815	. . . . . . . 8 ⊢ ((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → ¬ 𝐵 = -∞)
61	60	neqned 2940	. . . . . . 7 ⊢ ((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → 𝐵 ≠ -∞)
62	61	adantr 479	. . . . . 6 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ≠ -∞)
63		neqne 2941	. . . . . . 7 ⊢ (¬ 𝐵 = +∞ → 𝐵 ≠ +∞)
64	63	adantl 480	. . . . . 6 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ≠ +∞)
65	35, 62, 64	xrred 45050	. . . . 5 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐵 ∈ ℝ)
66		nfv 1910	. . . . . . . . . . 11 ⊢ Ⅎ𝑛 𝐵 ∈ ℝ
67	1, 66	nfan 1895	. . . . . . . . . 10 ⊢ Ⅎ𝑛(𝜑 ∧ 𝐵 ∈ ℝ)
68	13	adantr 479	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → 𝐴 ∈ ℝ^*)
69		simpr 483	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → 𝐵 ∈ ℝ)
70	67, 68, 69	xrralrecnnle 45068	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ ∀𝑛 ∈ ℕ 𝐴 ≤ (𝐵 + (1 / 𝑛))))
71	5	adantlr 713	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → 𝐴 ∈ ℝ)
72	6	adantl 480	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈ ℝ)
73	69	adantr 479	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ 𝑛 ∈ ℕ) → 𝐵 ∈ ℝ)
74	71, 72, 73	lesubaddd 11868	. . . . . . . . . . 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 3262	. . . . . . . . 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 405	. . . . . 6 ⊢ (((𝜑 ∧ 𝐵 ∈ ℝ) ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → 𝐴 ≤ 𝐵)
80	79	an32s 650	. . . . 5 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ 𝐵 ∈ ℝ) → 𝐴 ≤ 𝐵)
81	65, 80	syldan 589	. . . 4 ⊢ (((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) ∧ ¬ 𝐵 = +∞) → 𝐴 ≤ 𝐵)
82	34, 81	pm2.61dan 811	. . 3 ⊢ ((𝜑 ∧ ∀𝑛 ∈ ℕ (𝐴 − (1 / 𝑛)) ≤ 𝐵) → 𝐴 ≤ 𝐵)
83	82	ex 411	. 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 394 = wceq 1534 Ⅎwnf 1778 ∈ wcel 2100 ≠ wne 2933 ∀wral 3054 class class class wbr 5156 (class class class)co 7430 ℝcr 11164 0cc0 11165 1c1 11166 + caddc 11168 +∞cpnf 11302 -∞cmnf 11303 ℝ^*cxr 11304 < clt 11305 ≤ cle 11306 − cmin 11501 / cdiv 11928 ℕcn 12274 ℝ⁺crp 13038

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2102 ax-9 2110 ax-10 2133 ax-11 2150 ax-12 2170 ax-ext 2700 ax-sep 5307 ax-nul 5314 ax-pow 5373 ax-pr 5437 ax-un 7751 ax-cnex 11221 ax-resscn 11222 ax-1cn 11223 ax-icn 11224 ax-addcl 11225 ax-addrcl 11226 ax-mulcl 11227 ax-mulrcl 11228 ax-mulcom 11229 ax-addass 11230 ax-mulass 11231 ax-distr 11232 ax-i2m1 11233 ax-1ne0 11234 ax-1rid 11235 ax-rnegex 11236 ax-rrecex 11237 ax-cnre 11238 ax-pre-lttri 11239 ax-pre-lttrn 11240 ax-pre-ltadd 11241 ax-pre-mulgt0 11242 ax-pre-sup 11243

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2062 df-mo 2532 df-eu 2561 df-clab 2707 df-cleq 2721 df-clel 2806 df-nfc 2881 df-ne 2934 df-nel 3040 df-ral 3055 df-rex 3064 df-rmo 3373 df-reu 3374 df-rab 3429 df-v 3474 df-sbc 3789 df-csb 3905 df-dif 3962 df-un 3964 df-in 3966 df-ss 3976 df-pss 3979 df-nul 4336 df-if 4537 df-pw 4612 df-sn 4637 df-pr 4639 df-op 4643 df-uni 4919 df-iun 5008 df-br 5157 df-opab 5219 df-mpt 5240 df-tr 5274 df-id 5584 df-eprel 5590 df-po 5598 df-so 5599 df-fr 5641 df-we 5643 df-xp 5692 df-rel 5693 df-cnv 5694 df-co 5695 df-dm 5696 df-rn 5697 df-res 5698 df-ima 5699 df-pred 6317 df-ord 6383 df-on 6384 df-lim 6385 df-suc 6386 df-iota 6510 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-fv 6566 df-riota 7386 df-ov 7433 df-oprab 7434 df-mpo 7435 df-om 7885 df-1st 8011 df-2nd 8012 df-frecs 8304 df-wrecs 8335 df-recs 8409 df-rdg 8448 df-er 8742 df-en 8983 df-dom 8984 df-sdom 8985 df-sup 9492 df-inf 9493 df-pnf 11307 df-mnf 11308 df-xr 11309 df-ltxr 11310 df-le 11311 df-sub 11503 df-neg 11504 df-div 11929 df-nn 12275 df-n0 12535 df-z 12621 df-uz 12885 df-q 12995 df-rp 13039 df-fl 13823

This theorem is referenced by: preimageiingt 46411

W3C validator