i1 : R = ZZ/101[x,y,z] o1 = R o1 : PolynomialRing
i2 : p = matrix {{x^2,y^2},{x*y*z, x^3-y^3}} o2 = {0} | x2 y2 | {0} | xyz x3-y3 | 2 2 o2 : Matrix R <--- R
i3 : entries p 2 2 3 3 o3 = {{x , y }, {x*y*z, x - y }} o3 : List
