slice genus
integer-valued knot invariant; least genus of a surface in the 4-ball bounding the 3-sphere such that the boundary of the surface is the knot
en-GB/ˈslaɪs ˈd͡ʒiːnəs/
en-US/ˈslaɪs ˈd͡ʒinəs/
integer-valued knot invariant; least genus of a surface in the 4-ball bounding the 3-sphere such that the boundary of the surface is the knot