In this article, by using the modified CK direct method, we give a relationship between the generalized fifth-order KDV equations with variable coefficients and
This article presents a geometric exploration of the reconstruction of a model of the three-dimensional space that Leonardo da Vinci had before him or imagined
For A∈CmΧn, if the sum of the elements in each row and the sum of the elements in each column are both equal to 0, then A is called an indeterminate