[Fix] \renewnotation: check for correct argument whether it is already defined.
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@ -623,7 +623,7 @@
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% 8. optional: description of arguments for table of notation
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\DeclareDocumentCommand{\renewnotation}{s o m O{0} o m O{} O{}}{%
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% Check whether macro is not defined so far:
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\ifundef{#2}%
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\ifundef{#3}%
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{\PackageError{newnotation}{renewnotation: Command '\string#2' not defined.}%
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{Misspelled name?}}{}%
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%
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