## Known problems to be fixed - [ ] *Plot3DSys* function has issues when the matrix has a rows made of all zeros - [x] Exercise 4 in Notebook 1.2 displays a *RuntimeWarningError* due to a division by 0, if the "sliding" parameter *h* is set to 0 - [x] *printA* library method fails if it is given a row vector (i.e. a list of int/float) as input - [x] *ipywidgets* have troubles being displayed on **Noto** - [x] *echelonMat* function does not work on matrices having a column made of all zeros