Тензорная тригонометрия

This initiative math monograph in its original Russian edition (2004) was being created by the author sequentially and step by step in period 1998-2003 in rare free time from his labor and life activity and was finished with its large Appendix by the end of 2003, what is mapped on the author's personal web-site http://ninulas.narod.ru with English main page. Though principal results of its preliminary fundamental Part I was gotten by him else in 1981. The initial impulse consisted in solving by him in the middle 1980 year a problem from the Analytical Geometry, namely, to obtain exact non-rational and limit formulas for the vector-perpendicular falling from a given point onto a given plane in the Euclidean space through known elements of matrix and vector parameters in this task (in particular, as a normal and in general non rational (how usually) solution of a linear algebraic equation). The well-known article of Russian Academician A.N. Tikhonov of 1965 about equation’s normal solution by the regularization method with the use of a small parameter served to the author as the starting point for creating the preliminary Part I of his future book, what was logically developed by him further many later up to the entire contents of the book Tensor Trigonometry.