For most of my purposes, I use \varepsilon, so I have a \renewcommand{\epsilon}{\varepsilon} in my personal .sty file.
A recent homework problem in my numerical calculus class has meant that I would actually need to use the original "lunate" \epsilon.
Is there a way to preserve the original \epsilon in some other command and then redefine \epsilon?
I tried putting \newcommand{\lunate}{\epsilon} before my renewal of the \epsilon command, but that didn't give the behavior I was looking for.
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\let\lunate\epsilonbefore the\renewcommandshould work – Rmano Oct 14 '22 at 14:22\letdo differently from\newcommand? – Eric Williams Oct 14 '22 at 14:28\newcommandis basically a better\def) – Rmano Oct 14 '22 at 14:31\newcommandis basically worse\def. – wipet Oct 19 '22 at 17:48