Helping a friend writing a description of the courses taken, we seem to not find information about which is the correct preposition to put with "seminar". After looking through the Internet, in particular, university webpages, I found examples of both, so I cannot arrive to a final answer. I tried to check also some grammar references, but I was unsuccessful.
Which one is correct? "seminar on" or "seminar in"? In particular, is it "seminar on topology" or "seminar in topology"? And more generally, which is the rule to use "in" or "on" related to areas and fields of knowledge?