We prove lower bounds for the fundamental solutions of the non-divergence form operators $\sum _{i,j}a_{i,j}(x,t)X_{i}X_{j}-\partial _{t}$ and $\sum _{i,j}a_{i,j}(x)X ...
If a is a densely defined sectorial form in a Hilbert space which is possibly not closable, then we associate in a natural way a holomorphic semigroup generator with a. This allows us to remove in ...
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