I need to enter temperatures in documents and there are three three ways I can do this: 1. \circ (amsmath) 2. \degree (gensymb) 3. \textdegree (textcomp) I've tried all three, including putting all of 'em in the same \userpackage{} command in the preamble. Regardless, each throws an error when compiling using pdflatex. What have I done incorrectly? Rich