1. Institut für Mathematik Goethe–Universität Frankfurt Frankfurt am Main Germany
2. Department of Science Education Jeju National University Jeju‐si Jeju‐do South Korea
3. Department of Mathematical Sciences and Research Institute of Mathematics Seoul National University Gwanak‐gu Seoul South Korea
4. International Centre for Mathematical Sciences Edinburgh UK
5. Korea Institute for Advanced Study Dongdaemungu Seoul South Korea
6. Center for Quantum Structures in Modules and Spaces Seoul National University Gwanak‐gu Seoul South Korea
7. College of Liberal Studies and Research Institute of Mathematics Seoul National University Gwanak‐gu Seoul South Korea