ISBN-13: 9788770225816 / Angielski / Twarda / 2020 / 160 str.
ISBN-13: 9788770225816 / Angielski / Twarda / 2020 / 160 str.
he primary purpose of this book is the study of the invariance form of equation relative to the totally of the rectangular co-ordinate system in the three-dimensional Euclidean space.