Introduces a new invariant to classify 2-plat 2-knots as an analogue of a torsion invariant that also obstructs invertibility.
On the Alexander polynomials of 2-spheres in a 4-sphere
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On the classification of 2-plat 2-knots
Introduces a new invariant to classify 2-plat 2-knots as an analogue of a torsion invariant that also obstructs invertibility.