Theorem cncfrss 23493

Description: Reverse closure of the continuous function predicate. (Contributed by Mario Carneiro, 25-Aug-2014.)

Assertion

Ref	Expression
cncfrss	⊢ (𝐹 ∈ (𝐴–cn→𝐵) → 𝐴 ⊆ ℂ)

Proof of Theorem cncfrss

Dummy variables 𝑎 𝑏 𝑓 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-cncf 23480	. . 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	elmpocl1 7382	. 2 ⊢ (𝐹 ∈ (𝐴–cn→𝐵) → 𝐴 ∈ 𝒫 ℂ)
3	2	elpwid 4552	1 ⊢ (𝐹 ∈ (𝐴–cn→𝐵) → 𝐴 ⊆ ℂ)

Syntax hints:   → wi 4   ∈ wcel 2110  ∀wral 3138  ∃wrex 3139  {crab 3142   ⊆ wss 3935  𝒫 cpw 4538   class class class wbr 5058  ‘cfv 6349  (class class class)co 7150   ↑_m cmap 8400  ℂcc 10529   < clt 10669   − cmin 10864  ℝ⁺crp 12383  abscabs 14587  –cn→ccncf 23478

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-sep 5195  ax-nul 5202  ax-pow 5258  ax-pr 5321

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-br 5059  df-opab 5121  df-xp 5555  df-dm 5559  df-iota 6308  df-fv 6357  df-ov 7153  df-oprab 7154  df-mpo 7155  df-cncf 23480

This theorem is referenced by:  cncff  23495  cncfi  23496  rescncf  23499  cncffvrn  23500  cncfco  23509  cncfmpt2f  23516  cncfcnvcn  23523  cncombf  24253  cnlimci  24481  ulmcn  24981  efmul2picn  31862  mulcncff  42144  subcncff  42156  negcncfg  42157  addcncff  42160  ioccncflimc  42161  icocncflimc  42165  divcncff  42167  cncfcompt2  42175