摘要: where x, y are points in n-dimensional Euclidean space R" and k(x) is a homogeneous function of degree -n with mean value zero on xl = 1, let B(f) b(x)f(x). It well known (see ref. 1) that if k anid b sufficiently smooth bounded, then (AB BA)(0/0ax) (0/ax) BA) bounded operators Lp, I
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Néstor M. Rivière, On Singular Integrals American Journal of Mathematics. ,vol. 78, pp. 68- 105 ,(1956) , 10.1007/978-3-642-10918-8_3
A. P. Calderón, A. Zygmund, Singular Integral Operators and Differential Equations American Journal of Mathematics. ,vol. 79, pp. 257- 277 ,(1957) , 10.1007/978-94-009-1045-4_15