A SUFFICIENT AND NECESSARY CONDITION FOR HYPOELLIPTICITY OF A CLASS OF LEFT INVARIANT DIFFERENTIAL OPERATORS ON TWO STEP STRATIFIED NILPOTENT LIE GROUP
Zhu Jun ZHENG, Yi Shi DUAN
Acta Mathematicae Applicatae Sinica ›› 1999, Vol. 22 ›› Issue (3) : 321-326.
A SUFFICIENT AND NECESSARY CONDITION FOR HYPOELLIPTICITY OF A CLASS OF LEFT INVARIANT DIFFERENTIAL OPERATORS ON TWO STEP STRATIFIED NILPOTENT LIE GROUP
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