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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 6673 | . . 3 ⊢ (𝜑 → 𝐹 Fn 𝐴) |
| 3 | fncnvima2 7017 | . . 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 11203 | . . . . . . . 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 45947 | . . . . . 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 7040 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ) |
| 17 | 16 | rexrd 11196 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ*) |
| 18 | 17 | adantr 480 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ≤ 𝐵) → (𝐹‘𝑥) ∈ ℝ*) |
| 19 | 16 | mnfltd 13052 | . . . . . . 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 45896 | . . . . 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 3407 | . 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 3401 class class class wbr 5100 ◡ccnv 5633 “ cima 5637 Fn wfn 6497 ⟶wf 6498 ‘cfv 6502 (class class class)co 7370 ℝcr 11039 -∞cmnf 11178 ℝ*cxr 11179 < clt 11180 ≤ cle 11181 (,]cioc 13276 |
| 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 5245 ax-nul 5255 ax-pow 5314 ax-pr 5381 ax-un 7692 ax-cnex 11096 ax-resscn 11097 |
| 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 3402 df-v 3444 df-sbc 3743 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-id 5529 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-iota 6458 df-fun 6504 df-fn 6505 df-f 6506 df-fv 6510 df-ov 7373 df-oprab 7374 df-mpo 7375 df-pnf 11182 df-mnf 11183 df-xr 11184 df-ltxr 11185 df-ioc 13280 |
| This theorem is referenced by: issmfle2d 47196 |
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