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A = matrix(ZZ, 2, 3, [0, 1, 1,   -1, 0, 1])
A
[ 0 1 1] [-1 0 1] 
V = A.right_kernel(); V
Free module of degree 3 and rank 1 over Integer Ring Echelon basis matrix: [ 1 -1 1] 
V.basis()
[ (1, -1, 1) ] 
B = random_matrix(ZZ, 12, 30, x=-1, y=1); B
[-1 0 -1 -1 -1 0 -1 -1 0 -1 0 0 0 -1 0 0 0 -1 -1 -1 -1 0 0 -1 0 0 -1 0 -1 -1] [ 0 -1 0 -1 0 0 0 -1 0 0 0 0 0 -1 -1 -1 0 0 -1 0 0 -1 0 0 -1 -1 0 0 0 0] [ 0 -1 -1 -1 0 0 0 -1 -1 -1 -1 0 0 -1 -1 -1 -1 0 -1 0 0 0 0 -1 -1 0 -1 -1 -1 0] [-1 -1 -1 -1 -1 -1 0 -1 0 -1 -1 0 -1 -1 0 -1 0 0 -1 0 0 0 0 0 -1 -1 -1 -1 -1 0] [ 0 0 0 0 0 0 0 0 -1 0 -1 -1 -1 -1 0 -1 -1 0 0 0 -1 0 -1 0 -1 -1 -1 0 0 0] [-1 -1 0 0 0 -1 0 -1 -1 -1 -1 0 -1 -1 -1 0 -1 0 0 0 0 0 0 0 0 -1 -1 -1 0 -1] [-1 0 0 -1 0 -1 -1 -1 -1 -1 -1 0 -1 -1 0 0 0 0 0 0 -1 0 -1 0 -1 0 -1 -1 0 0] [ 0 0 -1 0 0 -1 -1 -1 0 -1 0 -1 0 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 0 0] [-1 0 0 0 -1 0 -1 0 0 0 0 -1 -1 0 0 -1 0 0 -1 0 0 -1 -1 -1 0 0 0 0 -1 -1] [-1 -1 -1 0 -1 -1 -1 0 -1 -1 0 0 -1 -1 0 0 -1 0 -1 0 -1 -1 -1 -1 0 -1 -1 0 -1 -1] [ 0 0 0 -1 -1 0 0 -1 0 0 -1 0 0 0 -1 0 0 -1 0 0 -1 -1 0 -1 -1 0 0 -1 0 0] [ 0 -1 0 -1 0 -1 0 0 -1 -1 -1 0 -1 -1 -1 -1 0 -1 -1 -1 0 -1 -1 0 -1 -1 0 0 0 -1] 
%time V = B.right_kernel(); V
Free module of degree 30 and rank 18 over Integer Ring Echelon basis matrix: [ 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 3 1 -4 3 -3 4 0 -5 -4 9 0 -1 -2 1] [ 0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 -1 1 -1 1 0 -2 -1 3 0 0 -1 0] [ 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 0 5 1 -8 6 -6 7 -3 -8 -5 14 0 2 -6 2] [ 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 2 0 -5 3 -4 5 -2 -4 -2 8 0 1 -4 2] [ 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 0 0 0 0 0] [ 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 0 -4 3 -3 3 -3 -2 0 4 0 2 -4 1] [ 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 2 -1 1 -2 0 1 1 -3 0 0 0 -1] [ 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 9 1 -17 14 -13 14 -11 -13 -5 23 1 8 -16 5] [ 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 7 1 -14 11 -10 12 -9 -10 -4 19 0 6 -13 4] [ 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 7 1 -13 11 -10 11 -9 -10 -4 18 0 7 -13 4] [ 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 10 1 -19 15 -14 17 -11 -16 -7 28 0 8 -17 6] [ 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 5 1 -8 7 -6 7 -5 -7 -3 12 0 4 -8 2] [ 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 9 1 -13 11 -9 10 -8 -12 -6 20 1 5 -12 3] [ 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 3 1 -5 4 -4 5 -1 -6 -3 11 -1 1 -4 1] [ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 -3 2 -2 2 -2 -2 -1 4 0 2 -3 1] [ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 1 -1 -1 1 0 0 0 -1] [ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11 1 -19 16 -14 16 -13 -15 -6 26 1 9 -18 6] [ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 1 -1 1 1 -1 0 2 -1 0 -1 -1] CPU time: 0.03 s, Wall time: 0.03 s 
V.basis()
[ (1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 3, 1, -4, 3, -3, 4, 0, -5, -4, 9, 0, -1, -2, 1), (0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, -1, 1, -1, 1, 0, -2, -1, 3, 0, 0, -1, 0), (0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 5, 1, -8, 6, -6, 7, -3, -8, -5, 14, 0, 2, -6, 2), (0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 2, 0, -5, 3, -4, 5, -2, -4, -2, 8, 0, 1, -4, 2), (0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0), (0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, -4, 3, -3, 3, -3, -2, 0, 4, 0, 2, -4, 1), (0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, -1, 1, -2, 0, 1, 1, -3, 0, 0, 0, -1), (0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 9, 1, -17, 14, -13, 14, -11, -13, -5, 23, 1, 8, -16, 5), (0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 7, 1, -14, 11, -10, 12, -9, -10, -4, 19, 0, 6, -13, 4), (0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 7, 1, -13, 11, -10, 11, -9, -10, -4, 18, 0, 7, -13, 4), (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 10, 1, -19, 15, -14, 17, -11, -16, -7, 28, 0, 8, -17, 6), (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 5, 1, -8, 7, -6, 7, -5, -7, -3, 12, 0, 4, -8, 2), (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 9, 1, -13, 11, -9, 10, -8, -12, -6, 20, 1, 5, -12, 3), (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 3, 1, -5, 4, -4, 5, -1, -6, -3, 11, -1, 1, -4, 1), (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, -3, 2, -2, 2, -2, -2, -1, 4, 0, 2, -3, 1), (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, -1, -1, 1, 0, 0, 0, -1), (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 1, -19, 16, -14, 16, -13, -15, -6, 26, 1, 9, -18, 6), (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 1, -1, 1, 1, -1, 0, 2, -1, 0, -1, -1) ]