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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 6661 | . . 3 ⊢ (𝜑 → 𝐹 Fn 𝐴) |
| 3 | fncnvima2 7005 | . . 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 11190 | . . . . . . . 8 ⊢ -∞ ∈ ℝ* | |
| 6 | 5 | a1i 11 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → -∞ ∈ ℝ*) |
| 7 | preimaiocmnf.2 | . . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ ℝ*) | |
| 8 | 7 | adantr 480 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → 𝐵 ∈ ℝ*) |
| 9 | simpr 484 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → (𝐹‘𝑥) ∈ (-∞(,]𝐵)) | |
| 10 | 6, 8, 9 | iocleubd 45992 | . . . . . 6 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ∈ (-∞(,]𝐵)) → (𝐹‘𝑥) ≤ 𝐵) |
| 11 | 10 | ex 412 | . . . . 5 ⊢ (𝜑 → ((𝐹‘𝑥) ∈ (-∞(,]𝐵) → (𝐹‘𝑥) ≤ 𝐵)) |
| 12 | 11 | adantr 480 | . . . 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 480 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝐹‘𝑥) ≤ 𝐵) → 𝐵 ∈ ℝ*) |
| 15 | 14 | adantlr 716 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → 𝐵 ∈ ℝ*) |
| 16 | 1 | ffvelcdmda 7028 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ) |
| 17 | 16 | rexrd 11183 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ*) |
| 18 | 17 | adantr 480 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → (𝐹‘𝑥) ∈ ℝ*) |
| 19 | 16 | mnfltd 13039 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → -∞ < (𝐹‘𝑥)) |
| 20 | 19 | adantr 480 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → -∞ < (𝐹‘𝑥)) |
| 21 | simpr 484 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → (𝐹‘𝑥) ≤ 𝐵) | |
| 22 | 13, 15, 18, 20, 21 | eliocd 45941 | . . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → (𝐹‘𝑥) ∈ (-∞(,]𝐵)) |
| 23 | 22 | ex 412 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ≤ 𝐵 → (𝐹‘𝑥) ∈ (-∞(,]𝐵))) |
| 24 | 12, 23 | impbid 212 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ∈ (-∞(,]𝐵) ↔ (𝐹‘𝑥) ≤ 𝐵)) |
| 25 | 24 | rabbidva 3396 | . 2 ⊢ (𝜑 → {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (-∞(,]𝐵)} = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≤ 𝐵}) |
| 26 | 4, 25 | eqtrd 2772 | 1 ⊢ (𝜑 → (◡𝐹 “ (-∞(,]𝐵)) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ≤ 𝐵}) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∈ wcel 2114 {crab 3390 class class class wbr 5086 ◡ccnv 5621 “ cima 5625 Fn wfn 6485 ⟶wf 6486 ‘cfv 6490 (class class class)co 7358 ℝcr 11026 -∞cmnf 11165 ℝ*cxr 11166 < clt 11167 ≤ cle 11168 (,]cioc 13263 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5231 ax-nul 5241 ax-pow 5300 ax-pr 5368 ax-un 7680 ax-cnex 11083 ax-resscn 11084 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-sbc 3730 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-id 5517 df-xp 5628 df-rel 5629 df-cnv 5630 df-co 5631 df-dm 5632 df-rn 5633 df-res 5634 df-ima 5635 df-iota 6446 df-fun 6492 df-fn 6493 df-f 6494 df-fv 6498 df-ov 7361 df-oprab 7362 df-mpo 7363 df-pnf 11169 df-mnf 11170 df-xr 11171 df-ltxr 11172 df-ioc 13267 |
| This theorem is referenced by: issmfle2d 47241 |
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