nLab: Tensor
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Comprehensive reference on tensors in higher category theory and diff geom.
More resources on Tensors
Differential Geometry
Learn differential geometry with George Lusztig! Explore tensors and more in this course from MIT OpenCourseWare.
Lectures on the Geometrical Anatomy of Theoretical Physics
Learn tensor calculus and its applications in theoretical physics with Frederic Schuller's geometrical anatomy course. Explore tensors geometrically!
mathworld.wolfram.com
MathWorld is Wolfram’s comprehensive online mathematics encyclopedia, offering detailed articles, definitions, formulas, and illustrations across a wide range of topics. It includes in-depth entries on tensors and tensor calculus, as well as related areas like linear algebra and differential geometry.
ocw.mit.edu
MIT OpenCourseWare offers free, openly accessible course materials from MIT across thousands of courses, including math, science, and engineering. You can explore lecture notes, problem sets, exams, and sometimes lecture videos to learn topics like tensors and related fundamentals.
Tensor Analysis on Manifolds
Tensor Analysis on Manifolds - A book resource
nptel.ac.in
NPTEL is an online education platform from IITs/IISc offering free video lectures, downloadable lecture notes, assignments, and certificates for courses in engineering, science, and humanities. It includes mathematics content such as tensor calculus, providing structured courses and practice problems to help learners master tensors.