On the problem of graph It is known that: "in a graph of order n, if there is a path from vertex u to vertex v (U is not equal to V), then there must be a primary path from u to V, and the length of the path is less than n-1." and "in a graph of order n, the length of any primary circuit is not greater than n." my question is: the primary path includes the primary circuit, so why is the length of any primary circuit not greater than N, rather than n-1 in a graph of order n?

On the problem of graph It is known that: "in a graph of order n, if there is a path from vertex u to vertex v (U is not equal to V), then there must be a primary path from u to V, and the length of the path is less than n-1." and "in a graph of order n, the length of any primary circuit is not greater than n." my question is: the primary path includes the primary circuit, so why is the length of any primary circuit not greater than N, rather than n-1 in a graph of order n?

When the primary loop passes through all the vertices, the path length can only be n, not n-1