Description: Sufficient conditions for a set of walks of a fixed length between two vertices to be empty. (Contributed by AV, 15-May-2021) (Proof shortened by AV, 21-May-2021)
Ref | Expression | ||
---|---|---|---|
Hypothesis | wwlksnon0.v | |
|
Assertion | wwlksnon0 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wwlksnon0.v | |
|
2 | df-wwlksnon | |
|
3 | 1 | wwlksnon | |
4 | 2 3 | 2mpo0 | |