Free Math Textbooks

By Xah Lee. Date: . Last updated: .

These are books that i've verified them in one way or another. Some i've read and consider good, some i checked up the author and is reputable mathematician, some are well known professors i know of, etc.

Number Theory


Here is a collection of calculus textbooks. These are top quality, and legally free.

Linear Algebra

first course:

more abstract approach:

Real Analysis

Complex Analysis

Differential Geometry


Logic, Proof Theory

Infomation Theory

Category Theory

not verified

the following i have not verified.

Math Books