MathCAD Prime 9.0 "instabiities" Dear all, I’m experimenting since a while, with MathCAD Prime 9.0 and a specific spreadsheet, what I’d classify as “numerical instabilities”.I’ll explain better. I’m dealing with a complex spreadsheet; this last:Reads from an Excel file the input dataRecalls (include command) a spreadsheet defining a function of 6 variables To be noticed that the above points have not created any trouble in previous spreadsheets 3. Involves recursive formulas with matrix multiplications and inversion 4. Involves the solution of a transcendental equation deriving from the determinant of a matrix; this last matrix is obtained at the end of the recursive process (hinted before 5. Is calculated using the options: Calculation/Calculation Options/ Multithreading;TOL & CTOL @ 10-7The spreadsheet, in itself, is not that big (around 350 Kb). Many different issues are highlighted.First, wit