tutte

tutte(k)

Compute the Tutte polynomial T(_x, _y) of a planar graph (no crossings).

Parameters:

k (PlanarDiagram | OrientedPlanarDiagram) – Planar diagram representing a planar graph (unoriented or oriented).

Returns:

SymPy expression T(_x, _y).

Raises:

ValueError – If k is not a planar graph (contains crossings).

Return type:

Expr