It's eleven o'clock, do you know where your mathematical software is?
My ICTP colleague Ralph Gebauer mentioned to me this article. It is in German. The main point however is discussed in the paper by Antonio J. Durán, Mario Pérez und Juan L. Varona titled "The Misfortunes of a Trio of Mathematicians Using Computer Algebra Systems. Can We Trust in Them?" linked in the article.
Determinants? Really?