@ARTICLE {, title = {O definícii}, author = {Bálint, Vojtech}, journal = {Obzory matematiky, fyziky a informatiky}, year = {2015}, volume = {44}, number = {2}, pages = {9--12}, issn = {1335-4981}, abstract = {The paper explains why it is appropriate from the didactic point of view for the study include the definition in the shape of the equivalence.}, }