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Null graph
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<p>In the <a href="/facts/Mathematics/pxTouaz4">mathematical</a> field of <a href="/facts/Graph_theory/VVPCd4TX">graph theory</a>, the term "null graph" may refer either to the <a href="/facts/Order_(graph_theory)/kw3eIBUe">order</a>-<a href="/facts/Zero/4NBRtKHc">zero</a> <a href="/facts/Graph_(discrete_mathematics)/kw3eIBUe">graph</a>, or alternatively, to any edgeless graph (the latter is sometimes called an "empty graph"). </p>