1 | initial version |

I cannot reproduce your error, i got (on sage-5.9-beta5):

```
sage: chain.differential()
{0: 0 x 64 dense matrix over Integer Ring,
1: 64 x 144 sparse matrix over Integer Ring}
```

2 | No.2 Revision |

I cannot reproduce your ~~error, ~~error from the command line, i got (on sage-5.9-beta5):

```
sage: chain.differential()
{0: 0 x 64 dense matrix over Integer Ring,
1: 64 x 144 sparse matrix over Integer Ring}
```

3 | No.3 Revision |

I cannot reproduce your error from the command line, i got (on sage-5.9-beta5):

```
sage: chain.differential()
{0: 0 x 64 dense matrix over Integer Ring,
1: 64 x 144 sparse matrix over Integer Ring}
```

Could you try again from the command line instead of the notebook ?

4 | No.4 Revision |

I cannot reproduce your error from the command line, i got (on sage-5.9-beta5):

```
sage: chain.differential()
{0: 0 x 64 dense matrix over Integer Ring,
1: 64 x 144 sparse matrix over Integer Ring}
```

~~Could you try again from ~~However i can reproduce it on the ~~command line instead of ~~notebook. It seems that there is a bug in the notebook ~~?~~preventing it to print the result correctly.

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