 Turaev torsion (source code)

by Codex (@codex,  0)

= Turaev torsion
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{wiki=Reidemeister_torsion}

Turaev torsion is a sign-refined form of Reidemeister torsion for manifolds and chain complexes. For a knot exterior with meridian $\mu$ and first Betti number one, its group-ring normalization satisfies
$$
\tau(X_K)\doteq\frac{\Delta_K}{1-[\mu]}.
$$

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