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 6638 | . . 3 ⊢ (𝜑 → 𝐹 Fn 𝐴) |
3 | fncnvima2 6977 | . . 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 11105 | . . . . . . . 8 ⊢ -∞ ∈ ℝ* | |
6 | 5 | a1i 11 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → -∞ ∈ ℝ*) |
7 | preimaiocmnf.2 | . . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ ℝ*) | |
8 | 7 | adantr 481 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → 𝐵 ∈ ℝ*) |
9 | simpr 485 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → (𝐹‘𝑥) ∈ (-∞(,]𝐵)) | |
10 | 6, 8, 9 | iocleubd 43334 | . . . . . 6 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → (𝐹‘𝑥) ≤ 𝐵) |
11 | 10 | ex 413 | . . . . 5 ⊢ (𝜑 → ((𝐹‘𝑥) ∈ (-∞(,]𝐵) → (𝐹‘𝑥) ≤ 𝐵)) |
12 | 11 | adantr 481 | . . . 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 481 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ≤ 𝐵) → 𝐵 ∈ ℝ*) |
15 | 14 | adantlr 712 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → 𝐵 ∈ ℝ*) |
16 | 1 | ffvelcdmda 7000 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ) |
17 | 16 | rexrd 11098 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ*) |
18 | 17 | adantr 481 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → (𝐹‘𝑥) ∈ ℝ*) |
19 | 16 | mnfltd 12933 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → -∞ < (𝐹‘𝑥)) |
20 | 19 | adantr 481 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → -∞ < (𝐹‘𝑥)) |
21 | simpr 485 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → (𝐹‘𝑥) ≤ 𝐵) | |
22 | 13, 15, 18, 20, 21 | eliocd 43282 | . . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → (𝐹‘𝑥) ∈ (-∞(,]𝐵)) |
23 | 22 | ex 413 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ≤ 𝐵 → (𝐹‘𝑥) ∈ (-∞(,]𝐵))) |
24 | 12, 23 | impbid 211 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ∈ (-∞(,]𝐵) ↔ (𝐹‘𝑥) ≤ 𝐵)) |
25 | 24 | rabbidva 3411 | . 2 ⊢ (𝜑 → {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (-∞(,]𝐵)} = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≤ 𝐵}) |
26 | 4, 25 | eqtrd 2777 | 1 ⊢ (𝜑 → (◡𝐹 “ (-∞(,]𝐵)) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≤ 𝐵}) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 396 = wceq 1540 ∈ wcel 2105 {crab 3404 class class class wbr 5087 ◡ccnv 5606 “ cima 5610 Fn wfn 6460 ⟶wf 6461 ‘cfv 6465 (class class class)co 7315 ℝcr 10943 -∞cmnf 11080 ℝ*cxr 11081 < clt 11082 ≤ cle 11083 (,]cioc 13153 |
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 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2708 ax-sep 5238 ax-nul 5245 ax-pow 5303 ax-pr 5367 ax-un 7628 ax-cnex 11000 ax-resscn 11001 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2815 df-nfc 2887 df-ne 2942 df-ral 3063 df-rex 3072 df-rab 3405 df-v 3443 df-sbc 3727 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-nul 4268 df-if 4472 df-pw 4547 df-sn 4572 df-pr 4574 df-op 4578 df-uni 4851 df-br 5088 df-opab 5150 df-id 5507 df-xp 5613 df-rel 5614 df-cnv 5615 df-co 5616 df-dm 5617 df-rn 5618 df-res 5619 df-ima 5620 df-iota 6417 df-fun 6467 df-fn 6468 df-f 6469 df-fv 6473 df-ov 7318 df-oprab 7319 df-mpo 7320 df-pnf 11084 df-mnf 11085 df-xr 11086 df-ltxr 11087 df-ioc 13157 |
This theorem is referenced by: issmfle2d 44585 |
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