This is a preview. Log in through your library . Abstract Analytic and Gevrey hypo-ellipticity are studied for operators of the form $P(x,y,D_x,D_y)=D^2_x+\sum_{j=1 ...
In this note we discuss an analog of the classical Waring problem for [symbol][x₀,x₁,..., xn]. Namely, we show that a general homogeneous polynomial p Є [symbol][x₀, X₁,..., xn] of degree divisible by ...
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