Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > preimaiocmnf | Structured version Visualization version GIF version |
Description: Preimage of a right-closed interval, unbounded below. (Contributed by Glauco Siliprandi, 23-Oct-2021.) |
Ref | Expression |
---|---|
preimaiocmnf.1 | ⊢ (𝜑 → 𝐹:𝐴⟶ℝ) |
preimaiocmnf.2 | ⊢ (𝜑 → 𝐵 ∈ ℝ*) |
Ref | Expression |
---|---|
preimaiocmnf | ⊢ (𝜑 → (◡𝐹 “ (-∞(,]𝐵)) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≤ 𝐵}) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | preimaiocmnf.1 | . . . 4 ⊢ (𝜑 → 𝐹:𝐴⟶ℝ) | |
2 | 1 | ffnd 6517 | . . 3 ⊢ (𝜑 → 𝐹 Fn 𝐴) |
3 | fncnvima2 6833 | . . 3 ⊢ (𝐹 Fn 𝐴 → (◡𝐹 “ (-∞(,]𝐵)) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (-∞(,]𝐵)}) | |
4 | 2, 3 | syl 17 | . 2 ⊢ (𝜑 → (◡𝐹 “ (-∞(,]𝐵)) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (-∞(,]𝐵)}) |
5 | mnfxr 10700 | . . . . . . . 8 ⊢ -∞ ∈ ℝ* | |
6 | 5 | a1i 11 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → -∞ ∈ ℝ*) |
7 | preimaiocmnf.2 | . . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ ℝ*) | |
8 | 7 | adantr 483 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → 𝐵 ∈ ℝ*) |
9 | simpr 487 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → (𝐹‘𝑥) ∈ (-∞(,]𝐵)) | |
10 | 6, 8, 9 | iocleubd 41842 | . . . . . 6 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → (𝐹‘𝑥) ≤ 𝐵) |
11 | 10 | ex 415 | . . . . 5 ⊢ (𝜑 → ((𝐹‘𝑥) ∈ (-∞(,]𝐵) → (𝐹‘𝑥) ≤ 𝐵)) |
12 | 11 | adantr 483 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ∈ (-∞(,]𝐵) → (𝐹‘𝑥) ≤ 𝐵)) |
13 | 5 | a1i 11 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → -∞ ∈ ℝ*) |
14 | 7 | adantr 483 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ≤ 𝐵) → 𝐵 ∈ ℝ*) |
15 | 14 | adantlr 713 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → 𝐵 ∈ ℝ*) |
16 | 1 | ffvelrnda 6853 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ) |
17 | 16 | rexrd 10693 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ*) |
18 | 17 | adantr 483 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → (𝐹‘𝑥) ∈ ℝ*) |
19 | 16 | mnfltd 12522 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → -∞ < (𝐹‘𝑥)) |
20 | 19 | adantr 483 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → -∞ < (𝐹‘𝑥)) |
21 | simpr 487 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → (𝐹‘𝑥) ≤ 𝐵) | |
22 | 13, 15, 18, 20, 21 | eliocd 41790 | . . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → (𝐹‘𝑥) ∈ (-∞(,]𝐵)) |
23 | 22 | ex 415 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ≤ 𝐵 → (𝐹‘𝑥) ∈ (-∞(,]𝐵))) |
24 | 12, 23 | impbid 214 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ∈ (-∞(,]𝐵) ↔ (𝐹‘𝑥) ≤ 𝐵)) |
25 | 24 | rabbidva 3480 | . 2 ⊢ (𝜑 → {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (-∞(,]𝐵)} = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≤ 𝐵}) |
26 | 4, 25 | eqtrd 2858 | 1 ⊢ (𝜑 → (◡𝐹 “ (-∞(,]𝐵)) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≤ 𝐵}) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 {crab 3144 class class class wbr 5068 ◡ccnv 5556 “ cima 5560 Fn wfn 6352 ⟶wf 6353 ‘cfv 6357 (class class class)co 7158 ℝcr 10538 -∞cmnf 10675 ℝ*cxr 10676 < clt 10677 ≤ cle 10678 (,]cioc 12742 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-cnex 10595 ax-resscn 10596 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-sbc 3775 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-id 5462 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-fv 6365 df-ov 7161 df-oprab 7162 df-mpo 7163 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-ioc 12746 |
This theorem is referenced by: issmfle2d 43090 |
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