Introductory Linear Algebra
Some elementary knowledge of algebra is assumed. Unit 1 of the Algebra wikibook should be more than enough to learn these elementary knowledge.
This book is part of a series on Algebra:
This book serves as a mild introduction to linear algebra, and is not too proof-heavy and proof-based. Most topics covered are useful for applications in disciplines other than mathematics. Thus, this book is probably more suitable for non-math majors. For math majors and people who want to study proof-based linear algebra, see Linear Algebra wikibook. This book should not be a prerequisite of the Linear Algebra wikibook (but may help understanding it), despite similar topics are covered, since the topics are discussed in quite a different way, and some definitions may differ.