Investigation of rigid integral and differential problem of IEF by tangent method

The article is devoted to the problem of development by methods of approximate solution of rigid integral and differential problem on the example of modeling of isoelectric focusing (IEF) in the so-called “anomalous” regimes. Two new methods of asymptotic solution of problem with large parameter are represented: the geometric tangent method, based on approximation of solution by the system of broken lines with known geometric parameters.