matrix - a rectangular array of elements (or entries) set out by rows and columns

diagonal - (mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry

diagonal matrix - a square matrix with all off-diagonal elements equal to zero

determinant - a square matrix used to solve simultaneous equations

Latin square - a square matrix of n rows and columns; cells contain n different symbols so arranged that no symbol occurs more than once in any row or column

magic square - a square matrix of n rows and columns; the first n-squared integers are arranged in the cells of the matrix is such a way that the sum of any row or column or diagonal is the same

nonsingular matrix - a square matrix whose determinant is not zero

singular matrix - a square matrix whose determinant is zero