Matrix Definition 7.0.1 a11 aml amn Note:m x n matrix,square matrix,entry,order,main diagonal,row matrix, column matrix The negative of a matrix is the matrix whose entries are the negatives of the original matrix. A zero matrix is one of any size all of whose entries are 0. Tongji University】 2/14Matrix . Definition 7.0.1 . .   a11 . . . a1n . . . . . . am1 . . . amn   Note: m × n matrix, square matrix, entry, order, main diagonal, row matrix, column matrix The negative of a matrix is the matrix whose entries are the negatives of the original matrix. A zero matrix is one of any size all of whose entries are 0. (Tongji University) Linear Algebra 2 / 14