The question I want to ask is about a concept for which there is a specific term in a foreign language. The problem is that this term doesn't have an accurate translation in english and since it covers a set of concepts rather than a concrete thing which means that trying to explain what that term means is also rather difficult.
To give a concrete example the question I want to ask about covers something which in German is called "Äquivalenzumformung". Both questions on German Stackexchange and Math Stackexchange agree that there is no accurate translation into English.
Since my question is rather about the subtleties of the term I doubt that me explaining that term can give English users who have never encountered that term an accurate concept.
Should I ask the question and just use the foreign word whenever needed or should I just post the entire question in German?
Also maybe someone does find an accurate translation for this case, but what about cases where there really are no accurate translations.