Generic Function Adjacentp (2 methods)

( adjacentp < graph > < vertex-1 > < vertex-2 > )

Part of:

package cl-graph

Return true if vertex-1 and vertex-2 are connected
by an edge. [?? compare with vertices-share-edge-p and remove one or
maybe call one directed-adjacentp]

Method Summary

adjacentp < basic-graph > < basic-vertex > < basic-vertex > 
adjacentp < basic-graph > < t > < t >