Increasing property and logarithmic convexity of functions involving Dirichlet lambda function

Abstract

In this article, with the help of an integral representation of the Dirichlet lambda function, by means of a monotonicity rule for the ratio of two integrals with a parameter, and by virtue of complete monotonicity and another property of an elementary function involving the exponential function, the authors find increasing property and logarithmic convexity of two functions containing the gamma function and the Dirichlet lambda function.

Keywords

• dirichlet lambda function
• increasing property
• logarithmic convexity
• integral representation
• complete monotonicity
• monotonicity rule
• gamma function
• exponential function
• zeta function
• primary 11m41
• secondary 11m06
• 26a48
• 26a51
• 33b10
• 33b15
• 44a10