m_1 = [1, 2, 3
       4, 5, 6
       7, 8, 9]

m_2 = [2, 3, 4
       5, 6, 7
       8, 9, 10]

m_3 = [1, 2, 1
       0, 1, 0
       2, 3, 4]

m_4 = [2, 5
       6, 7
       1, 8]

v = (1, 2, 3)

m_1 + m_2 = [3,  5,  7
             9,  11, 13
             15, 17, 19] and
m_2 - m_1 = [1, 1, 1
             1, 1, 1
             1, 1, 1] and
m_1 * m_2 = [36,  42,   48
             81,  96,  111
             126, 150, 174] and
[4, 9; 12, 3] / [2, 3; 4, 3] = [2, 3; 3, 1] and

m_1 + v = [2, 3, 4; 6, 7, 8; 10, 11, 12] and
m_1 - v = [0, 1, 2; 2, 3, 4; 4, 5, 6] and
m_1 * v = (14, 32, 50) and
m_1 / v = [1, 2, 3; 2, 5/2, 3; 7/3, 8/3, 3] and

m_1 + 2 = [3, 4,  5
           6, 7,  8
           9, 10, 11] and
m_1 - 2 = [-1, 0, 1
           2,  3, 4
           5,  6, 7] and
m_1 * 2 = [2, 4, 6
           8, 10, 12
           14, 16, 18] and
m_1 / 2 = [1/2, 1,   3/2
           2,   5/2, 3
           7/2, 4,   9/2] and

m_3 * m_4 = [15, 27
             6,  7
             26, 63]