Mathematics – Number Theory
Scientific paper
2007-05-22
Mathematics
Number Theory
Scientific paper
Given integers s and t, define a function phi_{s,t} on the space of all formal complex series expansions by phi_{s,t} (sum a_n x^n) = sum a_{sn+t} x^n. We define an integer r to be distinguished with respect to (s,t) if r and s are relatively prime and and r divides t (1 + s + ... s^{ord_r(s)-1}). The vector space consisting of all rational functions whose Taylor expansions at zero are fixed by phi_{s,t} was previously classified by constructing a basis that is partially indexed by integers that are distinguished with respect to the pair (s,t). In this paper, we study the properties of the set of distinguished integers with respect to (s,t). In particular, we demonstrate that the set of distinguished integers with respect to (s,t) can be written as a union of infinitely many arithmetic progressions. In addition, we construct another generating set for the collection of rational functions that are fixed by phi_{s,t} and discuss the relationship between this generating set and the basis that was generated previously.
Bennett Curtis D.
Mosteig Edward
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