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math.GT2009★ 1 cited
The Goeritz matrix and signature of a two bridge knot
Michael Gallaspy, Stanislav Jabuka
According to a formula by Gordon and Litherland, the signature of a knot K can be computed as the signature of a Goeritz matrix of K minus a suitable correction term, read off from…
math.GT2009★ 5 cited
The rational Witt class and the unknotting number of a knot
Stanislav Jabuka
We use the rational Witt class of a knot in the 3-sphere as a tool for addressing questions about its unknotting number. We apply these tools to several low crossing knots (151 kno…