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math.FA2019
Algebraic genericity of frequently universal harmonic functions on trees
N. Biehler, V. Nestoridis, A. Stavrianidi
We show that the set of frequently universal harmonic functions on a tree T contains a vector space except 0 which is dense in the space of harmonic functions on T seen as subset o…
math.FA2019
Frequently dense harmonic functions and universal martingales on trees
Evgeny Abakumov, Vassili Nestoridis, Massimo Picardello
We prove the existence of harmonic functions on trees, with respect to suitable transient transition operators , that satisfy an analogue of Menshov universal property in th…