Lecture Room B, 4th Floor, The 3rd General Building, NTHU
(清華大學綜合三館 4樓B演講室)
The Quotient Problem for Entire Functions
Ji Guo (National Tsing Hua University)
Abstract:
Let
%5C%7D_%7Bn%5Cin%5Cmathbb%20N%7D%24&chf=bg,s,333333&chco=ffffff)
and
%5C%7D_%7Bn%5Cin%5Cmathbb%20N%7D%24&chf=bg,s,333333&chco=ffffff)
be linear recurrence sequences. It is a well-known Diophantine problem to decide the finiteness of the set

of natural numbers such that their ratio
%2F%7B%5Cbf%20G%7D(n)%24&chf=bg,s,333333&chco=ffffff)
is an integer. In this paper we study an analogue of such a divisibility problem in the complex situation.
Namely,
we are concerned with the divisibility problem (in the sense of complex entire functions) for two sequences
%3Da_0%2Ba_1f_1%5En%2B%5Ccdots%2Ba_lf_l%5En%24&chf=bg,s,333333&chco=ffffff)
and
%3Db_0%2Bb_1g_1%5En%2B%5Ccdots%2Bb_mg_m%5En%24&chf=bg,s,333333&chco=ffffff)
, where the

and

are nonconstant entire functions and the

and

are non-zero constants except that


can be zero. We will show that the set

of natural numbers such that
%2FG(n)%24&chf=bg,s,333333&chco=ffffff)
is an entire function is finite under the assumption that

is not constant for any non-trivial index set
%5Cin%5Cmathbb%20Z%5E%7Bl%2Bm%7D%24&chf=bg,s,333333&chco=ffffff)
.