This template must be substituted. Replace {{Archive header with {{subst:Archive header.

{| style="width:100%;"

|- ! style="width:25%; text-align:center;"|<< Dec | Mathematics desk | Feb >> |}

Welcome to the Wikipedia Mathematics Reference Desk Archives
The page you are currently viewing is a monthly archive index. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages.