Introduction
Nowadays, Math is comparatively accessible discipline to everyone, who is eager to master it, and has some basic logical skills. It is because of the wide range of contemporary textbooks, hundreds of helpful websites and numerous highly-qualified teachers and professors, who are not only acquainted with the discipline itself, but are also talented in the art of teaching. However, the situation was not so bright in the old times, when the books on Math could not have been comprehended by a common person. Moreover, many theoretical and practical issues still had not been resolved, which complicated the teaching process ...
