In the mathematical field of graph theory, the term "null graph" may refer either to the order-zero graph, or alternatively, to any edgeless graph (the latter is sometimes called an "empty graph"). == Order-zero graph == The order-zero graph, K0, is the unique graph having no vertices (hence its order is zero).
In the mathematical field of graph theory, the term "null graph" may refer either to the order-zero graph, or alternatively, to any edgeless graph (the latter is sometimes called an "empty graph"). == Order-zero graph == The order-zero graph, K0, is the unique graph having no vertices (hence its order is zero).
Source: Wikipedia "Null graph" · CC BY-SA 4.0
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