This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.
Metamath Proof Explorer
Description: Zero is a set. (Contributed by David A. Wheeler, 7-Jul-2016)
|
|
Ref |
Expression |
|
Assertion |
c0ex |
|- 0 e. _V |
Proof
| Step |
Hyp |
Ref |
Expression |
| 1 |
|
0cn |
|- 0 e. CC |
| 2 |
1
|
elexi |
|- 0 e. _V |