Theorem idcncf 15240

Description: The identity function is a continuous function on ℂ. (Contributed by Jeff Madsen, 11-Jun-2010.) (Moved into main set.mm as cncfmptid 15236 and may be deleted by mathbox owner, JM. --MC 12-Sep-2015.) (Revised by Mario Carneiro, 12-Sep-2015.)

Hypothesis

Ref	Expression
idcncf.1	⊢ 𝐹 = (𝑥 ∈ ℂ ↦ 𝑥)

Assertion

Ref	Expression
idcncf	⊢ 𝐹 ∈ (ℂ–cn→ℂ)

Proof of Theorem idcncf

Step	Hyp	Ref	Expression
1		idcncf.1	. 2 ⊢ 𝐹 = (𝑥 ∈ ℂ ↦ 𝑥)
2		ssid 3224	. . 3 ⊢ ℂ ⊆ ℂ
3		cncfmptid 15236	. . 3 ⊢ ((ℂ ⊆ ℂ ∧ ℂ ⊆ ℂ) → (𝑥 ∈ ℂ ↦ 𝑥) ∈ (ℂ–cn→ℂ))
4	2, 2, 3	mp2an 426	. 2 ⊢ (𝑥 ∈ ℂ ↦ 𝑥) ∈ (ℂ–cn→ℂ)
5	1, 4	eqeltri 2282	1 ⊢ 𝐹 ∈ (ℂ–cn→ℂ)

Syntax hints:   = wceq 1375   ∈ wcel 2180   ⊆ wss 3177   ↦ cmpt 4124  (class class class)co 5974  ℂcc 7965  –cn→ccncf 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-in1 617  ax-in2 618  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-13 2182  ax-14 2183  ax-ext 2191  ax-sep 4181  ax-pow 4237  ax-pr 4272  ax-un 4501  ax-setind 4606  ax-cnex 8058

This theorem depends on definitions:  df-bi 117  df-3an 985  df-tru 1378  df-fal 1381  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-ne 2381  df-ral 2493  df-rex 2494  df-rab 2497  df-v 2781  df-sbc 3009  df-csb 3105  df-dif 3179  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-mpt 4126  df-id 4361  df-xp 4702  df-rel 4703  df-cnv 4704  df-co 4705  df-dm 4706  df-rn 4707  df-res 4708  df-ima 4709  df-iota 5254  df-fun 5296  df-fn 5297  df-f 5298  df-fv 5302  df-ov 5977  df-oprab 5978  df-mpo 5979  df-map 6767  df-cncf 15210

This theorem is referenced by:  sub1cncf  15241  sub2cncf  15242