there is trouble with the determinant method on a matrix over a funky ring
(yes, the same funky ring causing all my other problems). in its simplest
form:
In [43]: W.<w>=QQ['w']
In [44]: WZ.<z>=W['z']
In [45]: matrix(WZ,2,2,[1,z,z,z^2]).det()
Out[45]: <kaboom!!!>
the analog over a "shallower" polynomial ring works:
In [54]: matrix(W,2,2,[1,w,w,w^2]).det()
Out[54]: 0
i've implemented a local workaround, but i wanted to make this bug report.
(my workaround consists of wrapping the call to charpoly in a try...except
block, and then falling through to the other code which does expansion by
minors.)
-kyle
p.s. is there a more formal or preferred way to submit a bug report?
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