crossing_to_vertex

crossing_to_vertex(k, crossing, inplace=False)

Converts a crossing in a planar diagram to a vertex, by projecting it to a vertex.

Parameters:

• k (PlanarDiagram) – The planar diagram containing the crossing to be transformed.

• crossing – The crossing that will be converted into a vertex.

• inplace (bool, optional) – If True, modifies the PlanarDiagram in place; otherwise, creates and returns a copy with the transformation applied.

Returns:

PlanarDiagram – The modified PlanarDiagram with the specified crossing converted into a vertex.