I want to to translate my math preprint to Russian. Actually, the preprint is already translated, but I'm in doubt should I include the Russian version together with the English, earlier version of the preprint (available at kolosovpetro.github.io/series_representation_of_power_function). If it's acceptable to combine two language versions of math articles, can you provide some examples?
Is it acceptable to write a paper in English and add a a Russian translation at the end of the English version?