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-rw-r--r--buch/papers/laguerre/packages.tex2
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diff --git a/buch/papers/laguerre/packages.tex b/buch/papers/laguerre/packages.tex
index 4ebc172..a80d091 100644
--- a/buch/papers/laguerre/packages.tex
+++ b/buch/papers/laguerre/packages.tex
@@ -6,4 +6,4 @@
% if your paper needs special packages, add package commands as in the
% following example
-\usepackage{derivative}
+\DeclareMathOperator{\real}{Re} \ No newline at end of file