Abstract:
Some explicit multistage Runge-Kutta type methods for solving ordinary
differential equations (ODEs) are derived with the aid of the expansion of grid
functions in the Lagrange-Burmann series. The formulas are given
for the first four coefficients of the Lagrange-Burmann expansion. New explicit
first- and second-order methods are derived and applied to
the numerical integration of the Cauchy problem for a moderately
stiff ODE system. It turns out that the $L_2$-norm of the error
in the solution obtained by the new numerical second-order method
is 50 times smaller than that of the classical second-order
Runge-Kutta method.