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 ...

A major challenge in comparative genomics is to understand how phenotypic differences between species are encoded in their genomes. Phenotypic divergence may result from differential transcription of ...