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I have a rather document in which I have globally set \renewcommand{\epsilon}{\varepsilon}. However, in one specific location I would like to use the original \epsilon. I tried \newcommand{\originalepsilon}{\epsilon} before replacing its definition with \renewcommand in the preamble, but I guess it does not work this way. What is the best way to implement this? It is a long document where I would still like the \epsilon command to invoke \varepsilon everywhere else except in this one instance.

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    You have to use \let\originalepsilon\epsilon before redefining \epsilon. – egreg May 27 '13 at 0:04
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Thanks egreg, indeed it was \let as was shown by example in this thread https://stackoverflow.com/questions/5845887/how-do-i-use-renewcommand-to-get-back-my-greek-letters which I did not find before.

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