On Thursday 04 October 2007 15:38, Robert Bradshaw wrote:
> Craig's reply is a good summary of what I was going to say. I'm  
> getting an
>
> abort: unknown parent e91367eb18c1!

Well, it looks like William succeeded in looking at it as the patch is 
changed.

Craig mentioned the call to MatrixSpace is because multiplication of a matrix 
with QQ entries happens in the ZZ space.  I see that now, but it wasn't the 
only call to MatrixSpace.  That is, multiplication of a matrix with ZZ 
entries also called MatrixSpace (forgetting that sometimes we are square and 
can just use my existing parent).

I'm glad the matrix coercion code changed!  It truly looked a bit frightening.

--
Joel

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