The classical result of the authors mentioned in the title says that the uniform norm of $Q(D)f$ is bounded by the uniform norms of $Q_j(D)f$, $j=1,2,\ldots,k$ for functions $f$ of compact support if and only if $Q$ is in the span of $Q_j$'s (here $Q$ and $Q_j$'s are homogeneous polynomials of the same degree). In the talk I will present the analogs of this result with additional constraint that the estimate holds only for $f$ being a solution of differential equation $P(D)f=0$. This is joint work with Eduard Curca.
Meeting Id: 915 0269 9158 Password : 268545