We show, among other things, how knowing Schauder or Sobolev-space estimates for the one-dimensional heat equation allows one to derive their multidimensional analogs for equations with coefficients depending only on the time variable with the same constants as in the case of the one-dimensional heat equation. The method is quite general and is based on using the Poisson stochastic process. It also applies to equations involving non-local operators. It looks like no other methods are available at this time and it is a very challenging problem to find a purely analytical approach to proving such results.
Bibliographical noteFunding Information:
N. V. Krylov was partially supported by NSF Grant DMS-1160569 and by a grant from the Simons Foundation (#330456 to Nicolai Krylov). E. Priola was partially supported by the Italian PRIN Project 2010MXMAJR.
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