Students’ understanding of the relation between tangent plane and directional derivatives of functions of two variables

The Journal of Mathematical Behavior - Tập 46 - Trang 13-41 - 2017
Rafael Martínez-Planell1, María Trigueros Gaismán2, Daniel McGee3
1University of Puerto Rico at Mayaguez, United States
2Instituto Tecnológico Autónomo de México, Mexico
3Kentucky Center for Mathematics, United States