pimrecltneg - Mathbox for Glauco Siliprandi

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Theorem pimrecltneg 46106

Description: The preimage of an unbounded below, open interval, with negative upper bound, for the reciprocal function. (Contributed by Glauco Siliprandi, 26-Jun-2021.)

**Hypotheses**
Ref	Expression
pimrecltneg.x	⊢ Ⅎ𝑥𝜑
pimrecltneg.b	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ)
pimrecltneg.n	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ≠ 0)
pimrecltneg.c	⊢ (𝜑 → 𝐶 ∈ ℝ)
pimrecltneg.l	⊢ (𝜑 → 𝐶 < 0)

**Assertion**
Ref	Expression
pimrecltneg	⊢ (𝜑 → {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶} = {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)})

**Proof of Theorem pimrecltneg**
Step	Hyp	Ref	Expression
1		pimrecltneg.x	. . 3 ⊢ Ⅎ𝑥𝜑
2		rabidim1 3449	. . . . . . . 8 ⊢ (𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶} → 𝑥 ∈ 𝐴)
3	2	adantl 481	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → 𝑥 ∈ 𝐴)
4		1red 11239	. . . . . . . . . . 11 ⊢ (𝜑 → 1 ∈ ℝ)
5		pimrecltneg.c	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐶 ∈ ℝ)
6		pimrecltneg.l	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐶 < 0)
7	5, 6	ltned 11374	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐶 ≠ 0)
8	4, 5, 7	redivcld 12066	. . . . . . . . . 10 ⊢ (𝜑 → (1 / 𝐶) ∈ ℝ)
9	8	rexrd 11288	. . . . . . . . 9 ⊢ (𝜑 → (1 / 𝐶) ∈ ℝ^*)
10	9	adantr 480	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → (1 / 𝐶) ∈ ℝ^*)
11		0xr 11285	. . . . . . . . 9 ⊢ 0 ∈ ℝ^*
12	11	a1i 11	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → 0 ∈ ℝ^*)
13		pimrecltneg.b	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ)
14	2, 13	sylan2 592	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → 𝐵 ∈ ℝ)
15		rabidim2 44462	. . . . . . . . . 10 ⊢ (𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶} → (1 / 𝐵) < 𝐶)
16	15	adantl 481	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → (1 / 𝐵) < 𝐶)
17	4	adantr 480	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → 1 ∈ ℝ)
18		pimrecltneg.n	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ≠ 0)
19	3, 18	syldan 590	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → 𝐵 ≠ 0)
20	14, 19	rereccld 12065	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → (1 / 𝐵) ∈ ℝ)
21	5	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → 𝐶 ∈ ℝ)
22		0red 11241	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → 0 ∈ ℝ)
23	6	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → 𝐶 < 0)
24	20, 21, 22, 16, 23	lttrd 11399	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → (1 / 𝐵) < 0)
25	14, 19	reclt0 44767	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → (𝐵 < 0 ↔ (1 / 𝐵) < 0))
26	24, 25	mpbird 257	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → 𝐵 < 0)
27	17, 14, 26, 21, 23	ltdiv23neg 44770	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → ((1 / 𝐵) < 𝐶 ↔ (1 / 𝐶) < 𝐵))
28	16, 27	mpbid 231	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → (1 / 𝐶) < 𝐵)
29	10, 12, 14, 28, 26	eliood 44877	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → 𝐵 ∈ ((1 / 𝐶)(,)0))
30	3, 29	jca 511	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → (𝑥 ∈ 𝐴 ∧ 𝐵 ∈ ((1 / 𝐶)(,)0)))
31		rabid 3448	. . . . . 6 ⊢ (𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)} ↔ (𝑥 ∈ 𝐴 ∧ 𝐵 ∈ ((1 / 𝐶)(,)0)))
32	30, 31	sylibr 233	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}) → 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)})
33	32	ex 412	. . . 4 ⊢ (𝜑 → (𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶} → 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}))
34	31	simplbi 497	. . . . . . . 8 ⊢ (𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)} → 𝑥 ∈ 𝐴)
35	34	adantl 481	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → 𝑥 ∈ 𝐴)
36	9	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → (1 / 𝐶) ∈ ℝ^*)
37	11	a1i 11	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → 0 ∈ ℝ^*)
38	31	simprbi 496	. . . . . . . . . 10 ⊢ (𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)} → 𝐵 ∈ ((1 / 𝐶)(,)0))
39	38	adantl 481	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → 𝐵 ∈ ((1 / 𝐶)(,)0))
40	36, 37, 39	ioogtlbd 44929	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → (1 / 𝐶) < 𝐵)
41	4	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → 1 ∈ ℝ)
42	5	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → 𝐶 ∈ ℝ)
43	6	adantr 480	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → 𝐶 < 0)
44	35, 13	syldan 590	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → 𝐵 ∈ ℝ)
45	36, 37, 39	iooltubd 44923	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → 𝐵 < 0)
46	41, 42, 43, 44, 45	ltdiv23neg 44770	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → ((1 / 𝐶) < 𝐵 ↔ (1 / 𝐵) < 𝐶))
47	40, 46	mpbid 231	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → (1 / 𝐵) < 𝐶)
48	35, 47	jca 511	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → (𝑥 ∈ 𝐴 ∧ (1 / 𝐵) < 𝐶))
49		rabid 3448	. . . . . 6 ⊢ (𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶} ↔ (𝑥 ∈ 𝐴 ∧ (1 / 𝐵) < 𝐶))
50	48, 49	sylibr 233	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}) → 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶})
51	50	ex 412	. . . 4 ⊢ (𝜑 → (𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)} → 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}))
52	33, 51	impbid 211	. . 3 ⊢ (𝜑 → (𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶} ↔ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}))
53	1, 52	alrimi 2202	. 2 ⊢ (𝜑 → ∀𝑥(𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶} ↔ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}))
54		nfrab1 3447	. . 3 ⊢ Ⅎ𝑥{𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶}
55		nfrab1 3447	. . 3 ⊢ Ⅎ𝑥{𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}
56	54, 55	cleqf 2930	. 2 ⊢ ({𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶} = {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)} ↔ ∀𝑥(𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶} ↔ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)}))
57	53, 56	sylibr 233	1 ⊢ (𝜑 → {𝑥 ∈ 𝐴 ∣ (1 / 𝐵) < 𝐶} = {𝑥 ∈ 𝐴 ∣ 𝐵 ∈ ((1 / 𝐶)(,)0)})

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∀wal 1532 = wceq 1534 Ⅎwnf 1778 ∈ wcel 2099 ≠ wne 2936 {crab 3428 class class class wbr 5142 (class class class)co 7414 ℝcr 11131 0cc0 11132 1c1 11133 ℝ^*cxr 11271 < clt 11272 / cdiv 11895 (,)cioo 13350

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 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208 ax-pre-mulgt0 11209

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-id 5570 df-po 5584 df-so 5585 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-1st 7987 df-2nd 7988 df-er 8718 df-en 8958 df-dom 8959 df-sdom 8960 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-sub 11470 df-neg 11471 df-div 11896 df-rp 13001 df-ioo 13354

This theorem is referenced by: smfrec 46171

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