Metamath Proof Explorer
Description: The null graph (with no vertices and no edges) represented by the empty
set is a complete simple graph. (Contributed by AV, 1-Nov-2020)
|
|
Ref |
Expression |
|
Assertion |
cusgr0 |
|
Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
usgr0 |
|
2 |
|
cplgr0 |
|
3 |
|
iscusgr |
|
4 |
1 2 3
|
mpbir2an |
|