Inversion formulas for the three-dimensional Volterra integral equation of the first kind with prehistory

The article is devoted to solving one class of Volterra equations of the first kind with variable upper and lower limits. These equations were introduced in connection with the problem of identifying asymmetric kernels for constructing integral models of nonlinear dynamical systems of "input-output" type in the form of Volterra polynomials. To solve the identification problem, previously introduced test signals with duration $h$ (grid sampling step) are used in the form of a linear combination of Heaviside functions. The article demonstrates a method for obtaining the desired solution, which develops the step method for the one-dimensional case. Matching conditions are established that ensure the desired smoothness of the solution.