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math.NA2023
Operator-difference schemes on non-uniform grids for second-order evolutionary equations
P. N. Vabishchevich
The approximate solution of the Cauchy problem for second-order evolution equations is performed, first of all, using three-level time approximations. Such approximations are easil…
math.NA2023
Nonlinear approximation of functions based on non-negative least squares solver
Petr N. Vabishchevich
In computational practice, most attention is paid to rational approximations of functions and approximations by the sum of exponents. We consider a wide enough class of nonlinear a…