(mathematics) a rectangular array of quantities or expressions set out by rows and columns; treated as a single element and manipulated according to rules

(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

a square matrix with all elements not on the main diagonal equal to zero

a square matrix used to solve simultaneous equations

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

a square matrix of n rows and columns; the first n^2 integers are arranged in the cells of the matrix in such a way that the sum of any row or column or diagonal is the same

a square matrix whose determinant is not zero

(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