### About the first course in Mathematical Logic

In the version of this paper published in *Annuaire de l'Université de Sofia*, the following sentence occurs instead of the one with the link to the present note: “The first course of Mathematical Logic in Sofia University was given by Professor B. Petkanchin during the academic year 1959/1960”. The truth of this statement is not established. Maybe Petkanchin actually delivered a lecture course in mathematical logic in the above-mentioned academic year, but possibly not in Sofia University, and hardly a detailed one.
*Last modified on May 17, 2010.*