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Okay, never mind! The problem was \pagetotal. In fact, I replaced it with \pageref{LastPage} (using the lastpage pakcage) and it just works.

Don't ask why, I don't know.

Okay, so after a couple commenting/uncommenting tests, it seems that the error is located between the
"\section{Eigenvalues and Eigenvectors}" line and the "\section{Diagonalizing a matrix and Jordan form}" line.

Actually, if I comment the lines and all the other ones below (except the \end ...

Hello,

I am fairly new to LaTeX, have only written five 15-page physics papers, and did encounter some weird errors in the past, but the one I encountered today is by far the weirdest.

I suppose that I am doing something wrong somewhere in my documents, but since the only is, for the moment, an ...