#square_matrix  a matrix with the same number of rows and columns
  supertype:  #matrix  a rectangular array of elements (or entries) set out by rows and columns
  part:  #diagonal
  subtype:  #diagonal_matrix__diagonalmatrix  a square matrix with all off-diagonal elements equal to zero
     subtype:  #scalar_matrix  a diagonal matrix in which all of the diagonal elements are equal
        subtype:  #identity_matrix__unit_matrix  a scalar matrix in which all of the diagonal elements are unity
  subtype:  #determinant  a square matrix used to solve simultaneous equations
  subtype:  #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
  subtype:  #magic_square__magicsquare  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
  subtype:  #nonsingular_matrix__nonsingularmatrix  a square matrix whose determinant is not zero
  subtype:  #singular_matrix  a square matrix whose determinant is zero

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