premise: Anti-Dühring (German: "Herrn Eugen Dührings Umwälzung der Wissenschaft" , "Herr Eugen Dühring's Revolution in Science") is a book by Friedrich Engels, first published in German in 1878. It had previously been serialised in a periodical. There were two further German editions in Engels' lifetime. "Anti-Dühring" was first published in English translation in 1907.
hypothesis: Anti-Duhring has had a total of four publications worldwide. 
reason: Anti-Duhring had three publications in German, and one publication in English for a total of four publications. I believe the AI was unable to add each different publication to come up with a total.