Displaying 101 – 120 of 173

Showing per page

On the L 1 norm of exponential sums

S. K. Pichorides (1980)

Annales de l'institut Fourier

The L 1 norm of a trigonometric polynomial with N non zero coefficients of absolute value not less than 1 exceeds a fixed positive multiple of C ( log N ) / ( log log N ) 2 .

On the mean value of the mixed exponential sums with Dirichlet characters and general Gauss sum

Yongguang Du, Huaning Liu (2013)

Czechoslovak Mathematical Journal

The main purpose of the paper is to study, using the analytic method and the property of the Ramanujan’s sum, the computational problem of the mean value of the mixed exponential sums with Dirichlet characters and general Gauss sum. For integers m , n , k , q , with k 1 and q 3 , and Dirichlet characters χ , χ ¯ modulo q we define a mixed exponential sum C ( m , n ; k ; χ ; χ ¯ ; q ) = a = 1 q w i d t h 0 p t h e i g h t 1 e m ' χ ( a ) G k ( a , χ ¯ ) e m a k + n a k ¯ q , with Dirichlet character χ and general Gauss sum G k ( a , χ ¯ ) as coefficient, where ' denotes the summation over all a such that ( a , q ) = 1 , a a ¯ 1 mod q and e ( y ) = e 2 π i y . We mean value of m χ χ ¯ | C ( m , n ; k ; χ ; χ ¯ ; q ) | 4 , and...

Prime numbers with Beatty sequences

William D. Banks, Igor E. Shparlinski (2009)

Colloquium Mathematicae

A study of certain Hamiltonian systems has led Y. Long to conjecture the existence of infinitely many primes which are not of the form p = 2⌊αn⌋ + 1, where 1 < α < 2 is a fixed irrational number. An argument of P. Ribenboim coupled with classical results about the distribution of fractional parts of irrational multiples of primes in an arithmetic progression immediately implies that this conjecture holds in a much more precise asymptotic form. Motivated by this observation, we give an asymptotic...

Currently displaying 101 – 120 of 173