82 research outputs found
Set-theoretical entropies of weighted generalized shifts
In this paper for a finite field , a nonempty set , a self--map
and a weight vector , we
show that the set--theoretical entropy of the weighted generalized shift
is either zero or
, moreover it is equal to zero if and only if
is quasi--periodic. On the other hand after
characterizing all conditions under which
is of finite fibre, we
show that the cotravariant set--theoretical entropy of the finite fibre
depends only on
and . In final sections we study the restriction of
to the direct sum
Uniformizable functional Alexandroff spaces
In the following text we show that the Alexandroff space is uniformizable
if and only if the collection of all smallest neighbourhoods is a partition of
. Moreover the Alexandroff space is uniformizable and functional
Alexandroff (primal) if and only if the collection of all smallest
neighbourhoods is a partition of into its finite subsets.Comment: 8 page
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