... 1996.16 A. Yu. Karlovich, “On the essential norm of the Cauchy singular integral operator in weighted rearrangement-invariant spaces, ” Integral Equations and Operator Theory, vol. 38, no. 1, pp. ... ofMathematics and Its Applications, Kluwer Academic Publishers, Dordrecht, The Netherlands, 2002.11 I. C. Gohberg and N. Ja. Krupnik, The spectrum of singular integral operators in Lp spaces, ” ... max{αj}.Lemmas C and D for Lebesgue spaces defined on Euclidean spaces have been proved in 35 for the linear case and in 2 for sublinear operators. Lemma E. Let 1 <p,q< ;∞, and let T be a...