Abstract
The TWG4 "Geometry teaching and learning" focuses on studies related to geometry instruction, ranging from early childhood education to higher education, including the professional development of teachers. In CERME13, we sought to advance themes raised in previous ERME conferences, including, but not limited to, specific aspects of mathematical activity in geometry (visualization, interrelation between visual-spatial and formal aspects of geometry, problem-solving, proving, the role of diagrams and models); geometry curriculum in different countries (textbooks, didactic situations, tasks, activities, and competencies); teacher education in geometry (contexts, practices, challenges, and perspectives).
Along the traditional themes, the call for papers for the current conference reflected growing research interest in dynamic geometry environments (DGE, emphasizing geometric components). It also encouraged contributions focusing on teaching non-Euclidian geometry and adjacent branches of mathematics, such as trigonometry and vectors.