Resumen de The inner variation of an operator and the essential norms of pointwise multipliers in function spaces

Eugene Shargorodsky, David E. Edmunds

• We show that useful estimates for the essential norm of pointwise multipliers acting on a function space may be easily obtained from certain functional-analytic facts related to the notions of inner variation and the measure of noncompactness. Applications to Besov and Lizorkin-Triebel spaces are given