HomeHome Metamath Proof Explorer < Previous   Next >
Related theorems
GIF version

Theorem 0ncn 4045
Description: The empty set is not a complex number.
Assertion
Ref Expression
0ncn ¬ ∅ ∈ ℂ

Proof of Theorem 0ncn
StepHypRef Expression
1 0nelxp 2475 . 2 ¬ ∅ ∈ (R × R)
2 df-c 4034 . . 3 ℂ = (R × R)
32eleq2i 1153 . 2 (∅ ∈ ℂ ↔ ∅ ∈ (R × R))
41, 3mtbir 167 1 ¬ ∅ ∈ ℂ
Colors of variables: wff set class
Syntax hints:  ¬ wn 1   ∈ wcel 1092  ∅c0 1707   × cxp 2408  Rcnr 3787  ℂcc 4026
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-opab 2098  df-xp 2424  df-c 4034
metamath.org