clear all;

B = [2, -1, 0, 0; -1, 2, -1, 0;0, -1, 2, -1; 0, 0, -1, 2];

b = [0;0;0;5];

[U, Mk] = outer_product_gaussian_elimination(B);
back_substitution(U, b);

A = gaussian_elimination_with_complete_pivoting(B);