Media type: E-Article Title: Two Challenging Concepts in Mathematics Education: Subject-Specific Thoughts on the Complex Unit and Angles Contributor: Veith, Joaquin M.; Bitzenbauer, Philipp imprint: Bastas Publications, 2021 Published in: European Journal of Science and Mathematics Education Language: Not determined DOI: 10.30935/scimath/11251 ISSN: 2301-251X Keywords: Education Origination: Footnote: Access State: Open Access