This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.

Metamath Proof Explorer

Theorem 1cnd

Description: One is a complex number, deduction form. (Contributed by David A. Wheeler, 6-Dec-2018)

Ref Expression
Assertion 1cnd 
|- ( ph -> 1 e. CC )

Proof

Step Hyp Ref Expression
1 ax-1cn 
 |-  1 e. CC
2 1 a1i 
 |-  ( ph -> 1 e. CC )