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  • What aspects can characterize the specialised knowledge of a mathematics teacher educator? Francesca Martignone Federica Ferretti Luis J. Rodríguez-Muñiz Educación MTSK model Mathematics Teacher Specialised Knowledge Mathematics Teacher Educator This paper presents an exploratory qualitative study which was carried out by means of questionnaires for identifying some knowledge claimed by Mathematics Teacher Educators (MTEs) as important to be, or to become, a “good teacher educator”. The study focused the analysis on some teacher edu-cators’ answers about MTE’s specialised knowledge. Mathematics Teachers’ Specialised Knowledge model (the so-called MTSK model) helped us to identi-fy specific dimensions and domains of teacher educators’ specialised knowledge, identified in some mathematics teacher educators’ answers. From this informa-tion, by analysing similarities and differences and prevalent ideas, we raise hypotheses about some features that teacher educators believe as a part of MTE’s specialised knowledge. Finally, we propose an adaptation of the MTSK model that can describe the teacher educator’s specialised knowledge (Mathematics Teacher Educators’ Specialised Knowledge model - MTESK model) by capturing and including in the model the main issues obtained in the study. 2022 artículo científico 0187-8298 https://www.redalyc.org/articulo.oa?id=40576162012 https://www.redalyc.org/journal/405/40576162012/ https://www.redalyc.org/journal/405/40576162012/html/ https://www.redalyc.org/journal/405/40576162012/40576162012.epub https://www.redalyc.org/journal/405/40576162012/movil https://doi.org/10.24844/EM3403.11 en http://www.redalyc.org/revista.oa?id=405 Educación Matemática application/pdf Sociedad Mexicana de Investigación y Divulgación de la Educación Matemática A. C. Educación Matemática (México) Num.3 Vol.34