An undirected graph G is regular if each vertex has the same degree. For example, CycleGraph(4) is a regular graph of degree 2.
The IsRegular command returns true if the graph is regular and false otherwise. If a name d is specified, then this name is assigned the degree of the graph. If the graph is not regular and a name is specified, then the name is assigned FAIL.
G≔Graph 1: an undirected unweighted graph with 4 vertices and 4 edge(s)
P≔Graph 2: an undirected unweighted graph with 10 vertices and 15 edge(s)
C≔Graph 3: an undirected unweighted graph with 16 vertices and 40 edge(s)
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