2 papers
math.AP2017
Harnack's inequality for a class of non-divergent equations in the Heisenberg group
Farhan Abedin, Cristian E. Gutiérrez, Giulio Tralli
We prove an invariant Harnack's inequality for operators in non-divergence form structured on Heisenberg vector fields when the coefficient matrix is uniformly positive definite, c…
math.AP2016
estimates for the parallel refractor
Farhan Abedin, Cristian E. Gutierrez, Giulio Tralli
We consider the parallel refractor problem when the planar radiating source lies in a medium having higher refractive index than the medium in which the target is located. We prove…