The Structure of Algebras of Singular Integral Operators
Steffen Roch, Bernd Silbermann · Journal of Integral Equations and Applications · 1992
Under the above restrictions for p and α, the operator S is bounded on L p (α).Let Σ p (α) stand for the smallest closed subalgebra of the algebra L(L p (α)) of all bounded linear operators on L p (α) which contains the identity operator I and the singular integral operator S.