A generalized sum-difference inequality and applications to partial difference equations.
We consider functions , where is a smooth bounded domain, and is an integer. For all , such that , we prove that with , where is a smooth positive function which coincides with dist near , and denotes any partial differential operator of order .
We prove a multi-parameter Hilbert-type integral inequality with a hybrid kernel. We describe the best constant in the inequality in terms of hypergeometric functions. Some equivalent forms of the inequalities are also studied. By specifying parameter values we obtain results proved by other authors as well as many new inequalities.