Digital library
Textbooks, references and open learning resources.

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A Primer of Real Analysis
Dan Sloughter · Furman University
This is a short introduction to the fundamentals of real analysis. Although the prerequisites are few, I have written the text assuming the reader has the level of mathematical maturity of one who has completed the standard sequence of calculus courses, has had some exposure to the ideas of mathematical proof (including induction), and has an acquaintance with such basic ideas as equivalence relations and the elementary algebraic properties of the integers.

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Informal Calculus with Applications to Biological and Environmental Sciences
Tyler Seacrest · University of Montana Western
In the contents: 01: Algebra Tips and Tricks- Part I · 1.01: Algebra Tips and Tricks Part I (Combining Terms Distributing Functions Graphing) · 1.02: Homework for Algebra Tips and Tricks- Part I

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Quantitative Research Methods for Political Science, Public Policy and Public Administration
Jenkins-Smith et al. · University of Oklahoma
In the contents: 11.01: Matrix Algebra and Multiple Regression · 11.02: The Basics of Matrix Algebra

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Precalculus
Thomas Tradler and Holly Carley · CUNY New York City College of Technology
In the contents: 10.02: The Fundamental Theorem of Algebra · 14.01: Algebraic Properties of exp and log

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Developmental Math (NROC)
The NROC Project · LibreTexts
In the contents: 14.02: Algebraic Methods to Solve Systems of Equations

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Calculus - Early Transcendentals
LibreTexts · LibreTexts
In the contents: 7.06: Integration Using Tables and Computer Algebra Systems

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Gentle Introduction to the Art of Mathematics
Joseph Fields · Southern Connecticut State University
In the contents: 7.04: The Algebra of Combinations

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Mathematics for Elementary Teachers
Michelle Manes · University of Hawaii
In the contents: 04: Patterns and Algebraic Thinking · 4.06: Structural and Procedural Algebra · 6.13: Algebra Connections

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Yet Another Introductory Number Theory Textbook - Cryptology Emphasis
Jonathan A. Poritz · Colorado State University – Pueblo
In the contents: 1.02: Algebraic Operations with Integers

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MATH 1043
Jordan Simms · Nova Scotia Community College
In the contents: 02: Algebra · 2.02: The Fundamentals of Algebra · 2.2.01: Prelude to the Fundamentals of Algebra

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MC: Physics 121 - General Physics I
Charles Collett · Muhlenberg College
In the contents: 3.06: Algebra of Vectors · 3.07: Algebra of Vectors Examples
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Math C104: Mathematics for Elementary Teachers
Chau D. Tran · Coastline College
In the contents: 11.11: Algebra Connections

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Calculus I Notes
Kevin Palencia · Northern Illinois University
In the contents: 5.5.05: Other Options for Finding Algebraic Derivatives

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GSU-TM-Introductory Physics II (1112)
Taha Mzoughi · Georgia State University
In the contents: 2.9.05: Algebra of Vectors

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Support Course for Elementary Statistics: ISP
Larry Green · Lake Tahoe Community College
In the contents: 4.01: Evaluate Algebraic Expressions

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Math in Society
David Lippman · Pierce College
In the contents: 8.02: Linear (Algebraic) Growth

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Math 75X: Introduction to Mathematical Reasoning
J. Maureen Kearns · Honolulu Community College
In the contents: 04: Fundamentals of Algebra · 4.03: Evaluating (NOT Solving) Algebraic Expressions · 4.04: Simplifying (Still Not Solving) Algebraic Expressions)

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The Essence of Mathematics Through Elementary Problems
Alexandre Borovik & Tony Gardiner · University of Manchester & University of Birmingham
In the contents: 1.01: Mental Arithmetic and Algebra · 04: Algebra

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Support Course for Elementary Statistics
Larry Green · Lake Tahoe Community College
In the contents: 5.01: Evaluate Algebraic Expressions

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Scientific Computing
Peter Staab · Fitchburg State University
In the contents: 5.01: Introduction to Linear Algebra · 5.02: Advanced Topics in Linear Algebra