(1) -> A:=matrix [[1,2],[3,4],[5,6],[7,8]]

        +1  2+
        |    |
        |3  4|
   (1)  |    |
        |5  6|
        |    |
        +7  8+
                                                        Type: Matrix(Integer)
(2) -> B:=matrix [[1,2,3],[4,5,6]]

        +1  2  3+
   (2)  |       |
        +4  5  6+
                                                        Type: Matrix(Integer)
(3) -> A*B

        +9   12  15+
        |          |
        |19  26  33|
   (3)  |          |
        |29  40  51|
        |          |
        +39  54  69+
                                                        Type: Matrix(Integer)