check the planarity of a graph
graph or network
Important:The networks package has been deprecated. Use the superseding command GraphTheory[IsPlanar]instead.
This procedure checks the given graph for planarity.
A copy of the graph G is first simplified by use of gsimp() to remove loops and multiple edges.
The result of the procedure call is true if the resulting simple graph has a planar embedding and false otherwise.
This routine is normally loaded via the command with(networks) but may also be referenced using the full name networks[isplanar](...).
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