(50 minutes to learn)
An inner product is a kind of mathematical operator defined on a vector space which generalizes the dot product. It can be used to generalize notions like length, orthogonality, and angles to vector spaces other than the Euclidean one.
This concept has the prerequisites:
Core resources (read/watch one of the following)
→ Linear Algebra Done Right
A textbook for a second course in linear algebra, with mathematical generalizations of the basic concepts.
Location: Chapter 6, "Inner product spaces," subsections "Inner products" and "Norms"
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