is_integer_tangle

is_integer_tangle(tangle)

Check if a tangle is an integer tangle.

An integer tangle can be “horizontal” or “vertical”. Conditions checked:

• Diagram has exactly n - 4 crossings (where n is the number of nodes).

• All but one of its faces are bigons (2-gons).

Parameters:

tangle (PlanarDiagram | OrientedPlanarDiagram) – The tangle diagram to check.

Returns:

True if the tangle is an integer tangle, False otherwise.

Return type:

bool