Some Open Textbooks

• Basic Analysis I: Introduction to Real Analysis, Volume I by Jiří Lebl
• How We Got from There to Here: A Story of Real Analysis by Eugene Boman and Robert Rogers
• Measure, Integration & Real Analysis by Sheldon Axler
• A First Course in Complex Analysis by Matthias Beck, Gerald Marchesi, Dennis Pixton, and Lucas Sabalka
• Complex Variables: A Physical Approach by Steven G. Krantz
• BOOK OF PROOF by Richard Hammack
• Linear Algebra by Jim Hefferon
• Notes on Diffy Qs: Differential Equations for Engineers by Jiří Lebl