“…There are a lot of different descriptions and definitions of the belief concept in literature (Goldin, 2003;Green, 1971;Grigutsch, Raatz & Törner, 1998;Pajares, 1992;Schoenfeld, 1985;Stoffels, 2020;Thompson, 1992), furthermore a lot of research works mention that there is no consent on a definition of belief (Bräunling, 2017;Pehkonen, 1995;Rolka, 2006). Still, there seems to be no satisfactory answer to these theoretical problems; instead, a lot of research dealing with beliefs focus on exploring beliefs of different bearer groups, e.g., teachers and students (Törner, 2018), or the diversity of beliefs in different mathematical fields, establishing the concept of domain-specific beliefs (Eichler & Erens, 2015;Witzke & Spies, 2016).…”