Linear Algebra by Jim Hefferon
Professor Jim Hefferon’s book Linear Algebra is available as a free document (pdf). It covers the material of a first undergraduate Linear Algebra course. Eric Kidd says in his blog Random Hacks: “Don’t be fooled by the price: Hefferon’s book is better than most of the expensive tomes sold in college bookstores”. Linear Algebra is published under the GNU Free Documentation License and the Creative Commons Share Alike license.
Here you can find the book along with the answers to exercises:
Linear Algebra
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