Citation
Deraman, Fatanah
(2020)
Bound of character sums associated with Beatty sequences.
Doctoral thesis, Universiti Putra Malaysia.
Abstract
This study is on the bound problems of Beatty sequences. Beatty sequences appear
with special versatility in the arithmetic properties of sequences which is in the form
of [αᵣ] where α is an irrational and r is a natural number. This study consider nonhomogeneous
Beatty sequences in the set of Bα,Bα = {[αᵣ + β] : r = 1,2,3,...}
and concerns on solving distribution of bounds sequences with different conditions
of integer parts r.
The estimation of the double character sums can be obtained by identifying the
cardinality of double character sums. The identification of cardinality applies
properties of character sums associated with composite moduli. It consists of
multiplicative and additive character sums with representation of polar form in
double character sums extended to composite moduli. The character sums in this
form ∑X X(d1)X(d2) gives the result rely on φ(m)+1 if d1 is equal to d2 and for
the rest conditions will give zeroes. Thus the cardinality of double character sums
obtained is much less than φ(m)R#K where R is the highest integer terms in the
sequences under consideration.
Discrepancy of the sequences is used to estimate the bound due to the ability
of measuring the uniformity of the sequences. Then, by applying discrepancy,
Cauchy inequalities and the cardinality of the double character sums associated with
composite moduli, the estimation of Beatty sequences with different conditions of
integral parts r is obtained. This study provide six different conditions of integral
part r which are r is prime number associated with prime modulo, r is prime number
associated with composite moduli, r is Fibonacci number associated with composite
moduli, r is ysmooth number associated with prime modulo, r is ysmooth number associated with composite moduli and r is natural number associated with composite
moduli. In general, the result of bound problem under consideration is much less than (φ(m)) ¼ R+RDαβ (R).
As a conclusion the bounds of the character sums of Beatty sequences are depends
on the size of cardinality of double character sums.
Download File
Additional Metadata
Actions (login required)

View Item 