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| Mirrors > Home > MPE Home > Th. List > Mathboxes > preimaicomnf | Structured version Visualization version GIF version | ||
| Description: Preimage of an open interval, unbounded below. (Contributed by Glauco Siliprandi, 26-Jun-2021.) |
| Ref | Expression |
|---|---|
| preimaicomnf.1 | ⊢ (𝜑 → 𝐹:𝐴⟶ℝ*) |
| preimaicomnf.2 | ⊢ (𝜑 → 𝐵 ∈ ℝ*) |
| Ref | Expression |
|---|---|
| preimaicomnf | ⊢ (𝜑 → (◡𝐹 “ (-∞[,)𝐵)) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) < 𝐵}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | preimaicomnf.1 | . . . 4 ⊢ (𝜑 → 𝐹:𝐴⟶ℝ*) | |
| 2 | 1 | ffnd 6708 | . . 3 ⊢ (𝜑 → 𝐹 Fn 𝐴) |
| 3 | fncnvima2 7058 | . . 3 ⊢ (𝐹 Fn 𝐴 → (◡𝐹 “ (-∞[,)𝐵)) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (-∞[,)𝐵)}) | |
| 4 | 2, 3 | syl 18 | . 2 ⊢ (𝜑 → (◡𝐹 “ (-∞[,)𝐵)) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (-∞[,)𝐵)}) |
| 5 | mnfxr 11359 | . . . . . . 7 ⊢ -∞ ∈ ℝ* | |
| 6 | 5 | a1i 11 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ∈ (-∞[,)𝐵)) → -∞ ∈ ℝ*) |
| 7 | preimaicomnf.2 | . . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℝ*) | |
| 8 | 7 | ad2antrr 739 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ∈ (-∞[,)𝐵)) → 𝐵 ∈ ℝ*) |
| 9 | simpr 490 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ∈ (-∞[,)𝐵)) → (𝐹‘𝑥) ∈ (-∞[,)𝐵)) | |
| 10 | icoltub 46489 | . . . . . 6 ⊢ ((-∞ ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ (𝐹‘𝑥) ∈ (-∞[,)𝐵)) → (𝐹‘𝑥) < 𝐵) | |
| 11 | 6, 8, 9, 10 | syl3anc 1398 | . . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) ∈ (-∞[,)𝐵)) → (𝐹‘𝑥) < 𝐵) |
| 12 | 11 | ex 418 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ∈ (-∞[,)𝐵) → (𝐹‘𝑥) < 𝐵)) |
| 13 | 5 | a1i 11 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) < 𝐵) → -∞ ∈ ℝ*) |
| 14 | 7 | ad2antrr 739 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) < 𝐵) → 𝐵 ∈ ℝ*) |
| 15 | 1 | ffvelcdmda 7082 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐹‘𝑥) ∈ ℝ*) |
| 16 | 15 | adantr 486 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) < 𝐵) → (𝐹‘𝑥) ∈ ℝ*) |
| 17 | 15 | mnfled 13258 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → -∞ ≤ (𝐹‘𝑥)) |
| 18 | 17 | adantr 486 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) < 𝐵) → -∞ ≤ (𝐹‘𝑥)) |
| 19 | simpr 490 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) < 𝐵) → (𝐹‘𝑥) < 𝐵) | |
| 20 | 13, 14, 16, 18, 19 | elicod 13519 | . . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ (𝐹‘𝑥) < 𝐵) → (𝐹‘𝑥) ∈ (-∞[,)𝐵)) |
| 21 | 20 | ex 418 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) < 𝐵 → (𝐹‘𝑥) ∈ (-∞[,)𝐵))) |
| 22 | 12, 21 | impbid 215 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ((𝐹‘𝑥) ∈ (-∞[,)𝐵) ↔ (𝐹‘𝑥) < 𝐵)) |
| 23 | 22 | rabbidva 3419 | . 2 ⊢ (𝜑 → {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) ∈ (-∞[,)𝐵)} = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) < 𝐵}) |
| 24 | 4, 23 | eqtrd 2796 | 1 ⊢ (𝜑 → (◡𝐹 “ (-∞[,)𝐵)) = {𝑥 ∈ 𝐴 ∣ (𝐹‘𝑥) < 𝐵}) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 {crab 3413 class class class wbr 5103 ◡ccnv 5650 “ cima 5654 Fn wfn 6532 ⟶wf 6533 ‘cfv 6537 (class class class)co 7418 -∞cmnf 11334 ℝ*cxr 11335 < clt 11336 ≤ cle 11337 [,)cico 13471 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7749 ax-cnex 11249 ax-resscn 11250 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-ov 7421 df-oprab 7422 df-mpo 7423 df-er 8710 df-en 8967 df-dom 8968 df-sdom 8969 df-pnf 11338 df-mnf 11339 df-xr 11340 df-ltxr 11341 df-le 11342 df-ico 13475 |
| This theorem is used by: preimaioomnf 47698 |
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