Regularity of fundamental solutions for Lévy-type operators
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Abstract
For a class of non-symmetric non-local L\'evy-type operators $\mathcal{L}^{\kappa}$, which include those of the form $$ \mathcal{L}^{\kappa}f(x):= \int_{\mathbb{R}^d}( f(x+z)-f(x)- 1_{|z|<1} \left)\kappa(x,z)J(z)\, dz\,, $$ we prove regularity of the fundamental solution $p^{\kappa}$ to the equation $\partial_t =\mathcal{L}^{\kappa}$.
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