Sub-solutions and mean-value operators for ultraparabolic equations on Lie groups

Chiara Cinti
2007 Mathematica Scandinavica  
The aim of this paper is to provide a theory of sub-solutions for a class of hypoelliptic ultraparabolic operators $\mathcal L$, by using mean-value operators on the level sets of the fundamental solution of $\mathcal L$.
doi:10.7146/math.scand.a-15033 fatcat:omzlvtqwzjcjtkoh7xmkr35la4