-- -*- M2-comint -*- {* hash: -1302219552 *}

i1 : R = ZZ/32003[a..d,x_1..x_4];

i2 : N = matrix "a,b,c,d;x[1],x[2],x[3],x[4]"

o2 = | a   b   c   d   |
     | x_1 x_2 x_3 x_4 |

             2       4
o2 : Matrix R  <--- R

i3 : M = matrix "ad-2c3,(a-b)2+1,ab;,abc-1,"

o3 = | -2c3+ad a2-2ab+b2+1 ab |
     | 0       abc-1       0  |

             2       3
o3 : Matrix R  <--- R

i4 :