# bug column_space for IntegerModRing matrices with Sagemath9.6

11 views

### Rafael Robles

Mar 15, 2023, 4:41:50 AMMar 15
to sage-support
I have encountered the following bug with version 9.6 of SageMath under Ubuntu. This works perfectly in SageMath 9.1

Example:

A = matrix(IntegerModRing(2) , 2, 2, [1, 0, 1, 1])
A.column_space()

-> The kernel appears to have died. It will restart automatically.

### Dima Pasechnik

Mar 15, 2023, 5:00:40 AMMar 15
Please report this to Ubuntu. It works on a recent beta:

\$ ./sage
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 10.0.beta4, Release Date: 2023-03-12 │
│ Using Python 3.10.10. Type "help()" for help. │
└────────────────────────────────────────────────────────────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Warning: this is a prerelease version, and it may be unstable. ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
sage: A = matrix(IntegerModRing(2) , 2, 2, [1, 0, 1, 1])
....: A.column_space()
Vector space of degree 2 and dimension 2 over Ring of integers modulo 2
Basis matrix:
[1 0]
[0 1]
sage:

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