Gilbert Strang is a legend in mathematics education. His book is the standard text for undergraduate linear algebra courses worldwide, known for its intuitive approach rather than rote memorization.
If you need the full text for a course, official versions are available at retailers like AbeBooks or the AMS Bookstore for approximately $87.50–$98.58. mit.edu/">MIT website ? Go to product viewer dialog for this item. Introduction to Linear Algebra introduccion al algebra lineal gilbert strang pdf free