2 papers
math.GT2012
Invariants of Montesinos Twins
Adam C. Knapp
C. Giller proposed an invariant of ribbon 2-knots in S^4 based on a type of skein relation for a projection to R^3. In certain cases, this invariant is equal to the Alexander polyn…
math.SG2012
Symplectic Structures on the cotangent bundles of open 4-manifolds
Adam Knapp
We show that, for any two orientable smooth open 4-manifolds which are homeomorphic, their cotangent bundles are symplectomorphic with their canonical sym…