Reduction of the modified Poincaré differential equation to Birkhoff matrix form.
In this paper the reduction of the modified Poincaré linear differential equation with one -tuple regular singularity to the Birkhoff canonical matrix form is given.
In the present paper some complex vector functional equations of higher order without parameters and with complex parameters are solved.
In this paper some types of complex vector systems of partial linear and non-linear functional equations are solved.
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