# Some new uses of the η m ( Z ) functions

## Description

Abstract We present a procedure and a MATHEMATICA code for the conversion of formulae expressed in terms of the trigonometric functions sin (ω x), cos (ω x) or hyperbolic functions sinh (λ x), cosh (λ x) to forms expressed in terms of η_m(Z) functions. The possibility of such a conversion is important in the evaluation of the coefficients of the approximation rules derived in the frame of the exponential fitting. The converted expressions allow, among others, a full elimination of the 0/0 undetermin... Title of program: formConv Catalogue Id: AEFB_v1_0 Nature of problem Conversion in terms of the Η m (Z) functions and full elimination of the 0/0 undeterminacy in the coefficients of approximation rules derived in the frame of the exponential fitting. Versions of this program held in the CPC repository in Mendeley Data AEFB_v1_0; formConv; 10.1016/j.cpc.2009.08.007 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)