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| Graph[code][i,j] is adjacent matrix of oriented and coded graph of the knot. Let A+ , A- , B+ and B- be adjacent matrices of code ap, an, bp and bn (resp.). Goeritz matrix is (A+) + (A+)t - (A-) - (A-)t + (B+) + (B+)t - (B-) - (B-)t: t is transpose.
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