HYPOELLIPTIC ESTIMATE FOR SOME COMPLEX VECTOR FIELDS

摘要

cqvip:1 Introduction and Main Results LetΩ■Rnbe a neighborhood of 0,and denote by%the square root of—1.We considerthe following system of complex vector fieldsPj=■xj-i(■xjφ(x))■t,j=1,…,n,(x,t)∈Ω×R,(1.1)whereφ(x)is a real-valued function defined in.