Abstract
A block diagram is suggested for classifying differential equations whose solutions are special functions of mathematical physics. Three classes of these equations are identified: the hypergeometric, Heun, and Painleve classes. The constituent types of equations are listed for each class. The confluence processes that transform one type into another are described. The interrelations between the equations belonging to different classes are indicated. For example, the Painleve-class equations are equations of classical motion for Hamiltonians corresponding to Heun-class equations, and linearizing the Painleve-class equations leads to hypergeometric-class equations. The “confluence principle” is stated, and an example of its application is given.
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