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    STUDIA MATHEMATICA - Issue no. 4 / 2009  
         
  Article:   FUNCTIONALS ON NORMED SEQUENCE SPACES AND UNIFORM EXPONENTIAL INSTABILITY OF EVOLUTION OPERATORS.

Authors:  MIHAIL MEGAN, LARISA BIRIŞ.
 
       
         
  Abstract:  In this paper, we present necessary and sufficient conditions for uniform exponential instability of evolution operators in Banach spaces. Variants for uniform exponential instability of some well-known results due to Datko, Neerven and Zabczyk are given. As consequences, some results proved in [6] are obtained.

Key words and phrases. Exponential instability, evolution operator, functionals on function spaces.
 
         
     
         
         
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