| Affiliation: | 1. Dpto. de Didácticas Específicas, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain;2. Université Paris-Saclay, UVSQ, CNRS, Laboratoire de Mathématiques de Versailles, 78000, Versailles, France;3. Dpto de Álgebra, Análisis Matemático, Geometría y Topología, Universidad de Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain;1. Department of Mathematics, Swansea University, Swansea University Bay Campus, Fabian Way, Swansea SA1 8EN, UK;2. Faculty of Mathematics, University of Bia?ystok, K. Cio?kowskiego 1M, 15-245 Bia?ystok, Poland;3. Department of Mathematics, Heriot-Watt University, Edinburgh EH14 4AS, UK;4. Département de Mathématique, Université Libre de Bruxelles, Bd du Triomphe, B-1050 Brussels, Belgium;1. Department of Mathematical Sciences, DePaul University, Chicago, IL 60614, USA;2. Department of Mathematics, University of Oklahoma, Norman, OK 73019, USA;1. Department of Mathematics, Miami Dade College, Miami, FL 33135, United States of America;2. Department of Mathematics, MIT, Cambridge, MA 02139, United States of America |
