-- -*- M2-comint -*- hash: 6882624878141674308

i1 : A = matrix {{1, 0, 0, 1, 1}, {0, 1, 0, 1, -1}, {0, 0, 1, 0, 0}}

o1 = | 1 0 0 1 1  |
     | 0 1 0 1 -1 |
     | 0 0 1 0 0  |

              3       5
o1 : Matrix ZZ  <-- ZZ

i2 : M = matroid A

o2 = a "matroid" of rank 3 on 5 elements

o2 : Matroid

i3 : H = drop(hyperplanes M, 1)

o3 = {set {4, 2}, set {2, 3}, set {1, 2}, set {0, 2}}

o3 : List

i4 : elementaryQuotient(M, H, EntryMode => "hyperplanes")

o4 = a "matroid" of rank 2 on 5 elements

o4 : Matroid

i5 : 
