Galerkin Approximation of the Fractional Sobolev Constant

We establish sharp estimates for the discrete optimal constant of the fractional Sobolev inequality in dimension $N\ge 1$, with fractional exponent $s\in (0,\min \{1,N\mathrm{/}2\})$. The convergence rates that we establish take place for the Galerkin approximation with piecewise linear elements, when the computations are carried out in the unit ball, for which we employ a quasi-uniform and regular mesh.