3 problems

Let $\mathcal{T}$ be the group of topologically slice knots, let $\mathcal{T}_n$ be its bipolar filtration, and let … The map $\rho$ denotes knot reversal, and…

A knot $K$ is $n$-positive (respectively, $n$-negative) if it bounds a smoothly embedded disk in a simply connected, positive-definite (respectively, negative-definite) four-manifo…

Let ${\mathcal{T}}$ be the concordance subgroup of topologically slice knots, and let … be its bipolar filtration, where ${\mathcal{T}}_n$ consists of concordance classes that are…