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| Mirrors > Home > MPE Home > Th. List > cncfrss2 | Structured version Visualization version GIF version | ||
| Description: Reverse closure of the continuous function predicate. (Contributed by Mario Carneiro, 25-Aug-2014.) |
| Ref | Expression |
|---|---|
| cncfrss2 | ⊢ (𝐹 ∈ (𝐴–cn→𝐵) → 𝐵 ⊆ ℂ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-cncf 25205 | . . 3 ⊢ –cn→ = (𝑎 ∈ 𝒫 ℂ, 𝑏 ∈ 𝒫 ℂ ↦ {𝑓 ∈ (𝑏 ↑m 𝑎) ∣ ∀𝑥 ∈ 𝑎 ∀𝑦 ∈ ℝ+ ∃𝑧 ∈ ℝ+ ∀𝑤 ∈ 𝑎 ((abs‘(𝑥 − 𝑤)) < 𝑧 → (abs‘((𝑓‘𝑥) − (𝑓‘𝑤))) < 𝑦)}) | |
| 2 | 1 | elmpocl2 7665 | . 2 ⊢ (𝐹 ∈ (𝐴–cn→𝐵) → 𝐵 ∈ 𝒫 ℂ) |
| 3 | 2 | elpwid 4565 | 1 ⊢ (𝐹 ∈ (𝐴–cn→𝐵) → 𝐵 ⊆ ℂ) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2144 ∀wral 3076 ∃wrex 3086 {crab 3412 ⊆ wss 3895 𝒫 cpw 4556 class class class wbr 5102 ‘cfv 6539 (class class class)co 7421 ↑m cmap 8851 ℂcc 11202 < clt 11347 − cmin 11545 ℝ+crp 13124 abscabs 15407 –cn→ccncf 25203 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-xp 5656 df-dm 5660 df-iota 6494 df-fv 6547 df-ov 7424 df-oprab 7425 df-mpo 7426 df-cncf 25205 |
| This theorem is used by: cncff 25220 cncfi 25221 rescncf 25224 climcncf 25227 cncfco 25234 cncfcnvcn 25252 cnlimci 26215 cncfmptssg 46975 cncfcompt 46987 |
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