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Free Textbooks @ library.oapen.org (pdfs and downloads;
collected by subject and ordered alphabetically)

MIT:

MIT Physics I: Classical Mechanics Playlist (introductory video below!)
MIT Physics II: Electricity and Magnetism
MIT Physics III: Vibrations and Waves

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Example Lectures:

Introduction to Algorithms

This course provides an introduction to mathematical modeling of
computational problems. It covers the common algorithms, algorithmic
paradigms, and data structures used to solve these problems.
The course emphasizes the relationship between algorithms and
programming, and introduces basic performance measures and
analysis techniques for these problems.

Linear Algebra

This course covers matrix theory and linear algebra, emphasizing topics
useful in other disciplines. Linear algebra is a branch of mathematics
that studies systems of linear equations and the properties of matrices.
The concepts of linear algebra are extremely useful in physics,
economics and social sciences, natural sciences, and engineering.
Due to its broad range of applications, linear algebra is one of the
most widely taught subjects in college-level mathematics
(and increasingly in high school).

MIT Physics I: Classical Mechanics