I haven't come across unimodular matrices before, but according to the definition on wikipedia it seems fairly straightforward to implement a naive algorithm to decide it. Also, have you considered trying IRC for these sorts of short questions? The #haskell IRC channel on freenode is helpful and seems better suited to asking questions like this, if you just want quick answers. There's a shorter lag than a mailing list, and the IRC medium seems closer to the kinds of things I've seen you ask.
From observing the mailing list for quite a while, it seems that if you want a decent conversation on here, you should ask more "fleshed-out" questions with an explanation of some background to the problem, and more details on what you want and why.
-Dan
On Wed, Aug 3, 2011 at 5:45 PM, KC
-- -- Regards, KC
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