Associate Professor of the Department of Social and Economic Science of the Faculty № 2 of Kharkiv National University of Internal Affairs Oleksandr Moshenskyi with the participation of the inspector of the special company “Sumy” of MDNP in Sumy region, Senior Police Lieutenant Vadym Sabatovskyi conducted a binary lesson on logic “Hypothesis. Logical proof and refutation” (http://univd.edu.ua/uk/news/11517).