This document provides a mathematical problem to find the four fundamental subspaces of a given matrix. The matrix A is defined as a 13x13 matrix with the entries 1, 3, 1, 1, 3, 9, 3, 3, 0, 1, 1, 2, 7, 3, 1, 7, 2, 3, 9, 5, 3, 8, 2, 4. The problem asks to identify the four fundamental subspaces: the column space, nullspace, row space, and left nullspace.