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Theorem cncfrss2 15215
Description: Reverse closure of the continuous function predicate. (Contributed by Mario Carneiro, 25-Aug-2014.)
Assertion
Ref Expression
cncfrss2 (𝐹 ∈ (𝐴cn𝐵) → 𝐵 ⊆ ℂ)

Proof of Theorem cncfrss2
Dummy variables 𝑎 𝑏 𝑓 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-cncf 15210 . . 3 cn→ = (𝑎 ∈ 𝒫 ℂ, 𝑏 ∈ 𝒫 ℂ ↦ {𝑓 ∈ (𝑏𝑚 𝑎) ∣ ∀𝑥𝑎𝑦 ∈ ℝ+𝑧 ∈ ℝ+𝑤𝑎 ((abs‘(𝑥𝑤)) < 𝑧 → (abs‘((𝑓𝑥) − (𝑓𝑤))) < 𝑦)})
21elmpocl2 6173 . 2 (𝐹 ∈ (𝐴cn𝐵) → 𝐵 ∈ 𝒫 ℂ)
32elpwid 3640 1 (𝐹 ∈ (𝐴cn𝐵) → 𝐵 ⊆ ℂ)
Colors of variables: wff set class
Syntax hints:  wi 4  wcel 2180  wral 2488  wrex 2489  {crab 2492  wss 3177  𝒫 cpw 3629   class class class wbr 4062  cfv 5294  (class class class)co 5974  𝑚 cmap 6765  cc 7965   < clt 8149  cmin 8285  +crp 9817  abscabs 11474  cnccncf 15209
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 713  ax-5 1473  ax-7 1474  ax-gen 1475  ax-ie1 1519  ax-ie2 1520  ax-8 1530  ax-10 1531  ax-11 1532  ax-i12 1533  ax-bndl 1535  ax-4 1536  ax-17 1552  ax-i9 1556  ax-ial 1560  ax-i5r 1561  ax-14 2183  ax-ext 2191  ax-sep 4181  ax-pow 4237  ax-pr 4272
This theorem depends on definitions:  df-bi 117  df-3an 985  df-tru 1378  df-nf 1487  df-sb 1789  df-eu 2060  df-mo 2061  df-clab 2196  df-cleq 2202  df-clel 2205  df-nfc 2341  df-ral 2493  df-rex 2494  df-v 2781  df-un 3181  df-in 3183  df-ss 3190  df-pw 3631  df-sn 3652  df-pr 3653  df-op 3655  df-uni 3868  df-br 4063  df-opab 4125  df-id 4361  df-xp 4702  df-rel 4703  df-cnv 4704  df-co 4705  df-dm 4706  df-iota 5254  df-fun 5296  df-fv 5302  df-ov 5977  df-oprab 5978  df-mpo 5979  df-cncf 15210
This theorem is referenced by:  cncff  15216  cncfi  15217  rescncf  15220  climcncf  15223  cncfco  15230  cnlimci  15312
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