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Publicado en línea: 31 dic 2020
Páginas: 43 - 52
Recibido: 14 abr 2020
DOI: https://doi.org/10.2478/tmmp-2020-0031
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© 2020 Milan Paštéka, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Paštéka, Milan
Department of Mathematics and Informatics Faculty of Education University of Trnava, Institute of Mathematics Slovak Academy of Sciences BratislavaSlovakia