invariants

List of possible invairants to implement:

Alexander Polynomial Conway Polynomial Jones Polynomial HOMFLY-PT Polynomial Kauffman 2-variable Polynomial (F polynomial) Writhe Linking Number Seifert Genus (Upper Bound) Turaev Genus (more advanced but diagrammatic) Tricolorability n-Colorability (mod n coloring)

Modules

affine_index	Affine index polynomial for knotoids.
alexander(k[, symmetric])	Compute the one-variable Alexander polynomial via HOMFLY-PT specialization.
arrow	Arrow polynomial for knotoids (per Kauffman et al.).
bracket(k[, normalize])	Compute the Kauffman bracket polynomial ⟨·⟩.
cache	Lightweight LFU cache with an optional size cap.
classifier
coloring
conway(k)	Return the Alexander–Conway polynomial of a knot or link.
fundamental_group(k[, return_dict])	Return a presentation of the fundamental group of the complement of k in S³.
homflypt(k[, variables])	Compute the HOMFLY–PT polynomial.
jones(k)	Compute the Jones polynomial via the normalized Kauffman bracket.
kauffman(k)
mock_alexander	Mock Alexander-like polynomial (face-marking heuristic).
skein	Implementations of Skein operations.
tests
tutte(k)	Compute the Tutte polynomial T(_x, _y) of a planar graph (no crossings).
unplugging(k)	Computes the "unplugging" invariant T.
writhe(k)	Return the writhe of k.
yamada(k[, normalize])	Return the Yamada polynomial of a given planar diagram.