Crossing the cognitive gap between arithmetic and algebra: Operating on the unknown in the context of equations

Handbook of research on mathematics teaching and learning

Choice Reviews Online · 1992 · 6.1K citations

Education, Mathematics, Mathematics Education +10

On the dual nature of mathematical conceptions: Reflections on processes and objects as different sides of the same coin

Anna Sfard · Educational Studies in Mathematics · 1991 · 1.8K citations

Humanities, Mathematics, Philosophy +12

The journal of mathematical behavior

The Journal of Mathematical Behavior · 2000 · 655 citations

Natural Sciences, Mathematics, Applied Mathematics +1

Rational number concepts

Merlyn J. Behr, Richard Lesh, Thomas R. Post et al. · 1983 · 392 citations

A cognitive gap between arithmetic and algebra

Nicolas Herscovics, Liora Linchevski · Educational Studies in Mathematics · 1994 · 364 citations

Education, Mathematics, Mathematics Education +12