Based on an analysis of connotation and extension of the concept of the orthogonal curvilinear coordinates. we have deduced a platform of strain tensor expression of Cartesian coordinates. which turns out to be a function of Lame coefficient and unit vector. By using transform matrix between Cartesian coordinates and orthogonal curvilinear coordinates. https://www.diariolahumanidad.com/product-category/copertine-fascianti-per-neonati/