ABSTRACT
For a long time, the rate-determining step for the development of natural sciences has been the
possibility to perform numerical calculations. Even when possible, detailed modeling of actual
physicochemical systems was considered useless because of the practical impossibility of
performing numerical calculations. The ingenuity of theoreticians was accordingly concentrated
more on the construction of exactly or approximately solvable models rather than on the search
of accurate but unsolvable models. ‘‘Solvable’’ and ‘‘unsolvable’’ are, however, related to the
deployed mathematical apparatus-much of what remained unsolvable after centuries of
development of calculus and analysis has become solvable after the advent of electronic
computers.
