Hardy-Sobolev-Maz'ya Inequalities for

We establish Hardy–Sobolev–Maz’ya inequalities in the subquadratic range $1<p<2$ for singularities supported on affine subspaces and for arbitrary domains. We first prove a Hardy–Sobolev–Maz’ya inequality for singularities supported on affine subspaces of arbitrary codimension $1\le k<N$, showing that the deficit in the sharp Hardy inequality controls a suitable weighted Sobolev norm. Combining the same convexity estimate with the one-dimensional approach of Frank and Loss in [9], we also establish Hardy–Sobolev–Maz’ya inequalities on arbitrary domains with the mean distance to the boundary and thereby solve a problem posed in [9]. These results complete the previously unresolved subquadratic range $1<p<2$ and, together with the known results for $p\ge 2$, provide a unified Hardy–Sobolev–Maz’ya theory for all $1<p<N$ associated with plane singularities and general domains.