We shall operate in N-dimensional euclidean space EN, N _ 2, and use the following notation. x = (xI, *.* , XN) and B(x, r) = the open N-ball with center x and radius r. Also, we shall adopt the convention that if P(x) is a polynomial of degree less than zero, then P(x) is identically zero. We say the function f(x) is in T'(x,), a c N, if f(x) is in L' in a neighborhood of the point x0, and if there is a polynomial P(x) of degree strictly less than a such that
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