Reasoning-and-proving in the written curriculum: Lessons and implications for teachers, curriculum designers, and researchers

Reasoning-and-proving is fundamental to mathematics. The opportunities provided within the written curriculum of textbooks for students to engage with this fundamental process have the potential to influence students' mathematical learning in significant ways. The five papers in this special issue shed light on the opportunities within the curriculum related to reasoning-and-proving from the elementary level to the university undergraduate level. Together, they offer lessons and implications for teachers, curriculum designers, and researchers.