I search a translation for the term "intertwiner" into german.
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I (native speaker) learned the term "Vertauschungsoperator" in my undergraduate courses. Unfortunately I cannot cite any reference right now, except the fact that the lecturer of the courses, Prof H.S. Holdgruen, is very sensible in his use of the german language. Therefore I estimate the probability very high that this is a common term in german texts on representation theory. 


I think it can be translated as Verketter or Vermittler. See e.g http://www.theorie.physik.unigoettingen.de/~rehren/ps/cqft.pdf on p.128. But I should warn that I am not a native speaker. 

