@ARTICLE {, title = {Hrozny problémů ve školské matematice (2. část)}, author = {Kopka, Jan}, journal = {Obzory matematiky, fyziky a informatiky}, year = {2021}, volume = {50}, number = {1}, pages = {19--29}, issn = {1335-4981}, abstract = {In the first part we described a teaching method called “The Creation of Clusters of Problems” and gave two school examples. We now give another example and also show two examples of so called isolated problems, which are often overly difficult in school mathematics.}, }