À propos de cet article
Publié en ligne: 22 sept. 2020
Pages: 229 - 237
Reçu: 03 sept. 2019
Accepté: 09 oct. 2019
DOI: https://doi.org/10.2478/auom-2020-0029
Mots clés
© 2020 Dariusz Sokołowski, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Sokołowski, Dariusz
Institute of Mathematics, University of SilesiaKatowice, Poland