Global Smoothness Preservation by General Operators

  • George A. Anastassiou
  • Sorin G. Gal


In this chapter we search the conditions under which global smoothness of a function f (as measured by its modulus of continuity) is preserved by the elements of general approximating sequences (L n f). As one consequence we obtain statements concerning the invariance of Lipschitz classes under operators of several types. An important tool in our approach is the least concave majorant of a modulus of continuity. Here we follow the basic study done by the first author, Cottin and Gonska [22].


Manifold Stein 


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Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • George A. Anastassiou
    • 1
  • Sorin G. Gal
    • 2
  1. 1.Department of Mathematical SciencesUniversity of MemphisMemphisUSA
  2. 2.Department of MathematicsUniversity of OradeaOradeaRomania

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