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math.FA2022
Simultaneous approximation of translation operators
Nikos Tsirivas
We prove the existence of entire functions that achieve universal approximations on certain countable sequences of translation operators .
math.FA2015
Common hypercyclic vectors for certain families of differential operators
Nikos Tsirivas
Let (k(n)) n=1,2,... be a strictly increasing sequence of positive integers . We consider a specific sequence of differential operators Tk(n),λ , n=1,2,... on the space of entire f…
math.FA2015
Common hypercyclic vectors for families of backward shift operators
Nikos Tsirivas
We provide necessary and sufficient conditions on the existence of common hypercyclic vectors for multiples of the backward shift operator along sparse powers. Our main result stro…