*45%*:**Student Objections to and Understanding of Non-Cartesian Unit Vector Notation in Upper-Level E&M***37%*:**Student understanding of basic probability concepts in an upper-division thermal physics course***34%*:**Student Ideas around Vector Decomposition in the Upper Division***31%*:**Plasticity of intermediate mechanics students’ coordinate system choice***31%*:**Investigating student ownership of projects in an upper-division physics lab course***31%*:**Student Perspectives on Using Clickers in Upper-division Physics Courses***31%*:**Problem-based learning in upper division courses: Student successes, perceptions, and reactions***31%*:**Upper-division student understanding of Coulomb's law: Difficulties with continuous charge distributions***30%*:**MIT Physics 8.02: Vector Fields Visualizations - Coordinate Systems***30%*:**Students' difficulties with unit vectors and scalar multiplication of a vector***29%*:**Initial understanding of vector concepts among students in introductory physics courses***29%*:**Student Learning In Upper-Level Thermal Physics: Comparisons And Contrasts With Students In Introductory Courses***28%*:**Upper-Level Physics Students’ Conceptions Of Understanding***28%*:**Analyzing student understanding of vector field plots with respect to divergence***26%*:**Student determination of differential area elements in upper-division physics***25%*:**Graphical representations of vector functions in upper-division E&M***25%*:**Upper-division students' difficulties with Ampère's law***25%*:**Observations on student difficulties with mathematics in upper-division electricity and magnetism***25%*:**Analytic framework for students’ use of mathematics in upper-division physics**