Digital library
Textbooks, references and open learning resources.

External
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 · 1.02: Direct and Inverse Procedures · 1.03: Structural Arithmetic

External
Open Algebra and Knots
Matthew Salomone · Bridgewater State University
In the contents: 1.01: Tangle Basics · 1.02: Tangle Arithmetic · 02: Knots and Numbers

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Professor Holz' Topics in Contemporary Mathematics
Daniel Holz · SUNY Schenectady County Community College
In the contents: 1.1.02: Statements and Quantifiers · 1.2.01: Truth Tables- Conjunction (and) Disjunction (or) Negation (not) · 02: Sets and Counting
External
Math 372: College Algebra for Calculus
Roy Simpson · Cosumnes River College
In the contents: 1.02: Function Arithmetic and the Difference Quotient · 02: Linear and Quadratic Functions · 3.02: The Factor and Remainder Theorems

External
Technical Mathematics SJDC 1
Jacquelynn Schwegel · San Joaquin Delta College
In the contents: 01: Review of Arithmetic · 1.07: Evaluating Algebraic Expressions and Formulas · 2.02: Solving Equations with Addition and Subtraction Properties of Equality

External
Complex Analysis - A Visual and Interactive Introduction
Juan Carlos Ponce Campuzano · University of Queensland
In the contents: 1.02: Terminology and Notation · 1.03: Geometric Interpretation of the Arithmetic Operations · 3.03: Analytic Landscapes

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Math 111: College Algebra
Highline College
In the contents: 01: Functions and Lines · 1.01: Functions and Function Notation · 1.1E: Functions and Function Notation

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MGF 1131: Mathematics in Context (FSW)
Cheban Acharya · Florida Southwestern State College
In the contents: 01: Number Representation in Different Bases and Cryptography · 1.04: Addition and Subtraction in Base Systems · 1.06: Modular Arithmetic
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Math 384: Lecture Notes
Roy Simpson · Cosumnes River College
In the contents: 01: Triangles and Circles · 1.01: Angles and Basic Geometry · 1.04: Circles and Angles in the Rectangular Coordinate System

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Elementary Differential Equations with Boundary Values Problems
William F. Trench · Trinity University
In the contents: 1.02: Basic Concepts · 1.2E: Basic Concepts (Exercises) · 2.03: Existence and Uniqueness of Solutions of Nonlinear Equations

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Physical Modeling in MATLAB
Allen B. Downey · Olin College
In the contents: 01: Modeling and Simulation · 2.07: Assignment and Equality · 3.03: Absolute and Relative Error

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MAT 149 Topics In Finite Mathematics
Daniel Holz · SUNY Schenectady County Community College
In the contents: 1.01: Statements and Truth Values · 1.1.02: Statements and Quantifiers · 1.2.02: Truth Tables for the Conditional and Biconditional

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Corequisite Codex
Roy Simpson · Cosumnes River College
In the contents: 01: Sets and Numbers · 1.02: Sets and Set Notation · 1.06: Inequalities and Inequality Notation

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Contemporary Mathematics
OpenStax · OpenStax
In the contents: 1.01: Basic Set Concepts · 1.03: Understanding Venn Diagrams · 2.01: Statements and Quantifiers

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A First Course in Linear Algebra
Ken Kuttler · Brigham Young University
In the contents: 1.05: Rank and Homogeneous Systems · 2.01: Matrix Arithmetic · 2.06: The Identity and Inverses

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Complex Variables with Applications
Jeremy Orloff · Massachusetts Institute of Technology
In the contents: 01: Complex Algebra and the Complex Plane · 1.03: Terminology and Basic Arithmetic · 1.10: Concise summary of branches and branch cuts

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MATH 2150: Higher Arithmetic
Pamini Thangarajah · Mount Royal University
In the contents: 0.1: Basics · 0.3: Proof Do's and Dont's · 0.4: Egyptian Multiplication and Division (optional)

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Mathematical Reasoning
Pamini Thangarajah · Mount Royal University
In the contents: 1: Basic Language of Mathematics · 1.0 : Introduction to the Basic Language of Mathematics · 1.E: Basic Language of Mathematics (Exercises)

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Fundamentals of Matrix Algebra
Gregory Hartman · Virginia Military Institute
In the contents: 1.03: Elementary Row Operations and Gaussian Elimination · 1.04: Existence and Uniqueness of Solutions · 02: Matrix Arithmetic

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Math 287 Differential Equations and Linear Algebra
SeanS Smith · Santa Ana College
In the contents: 2.05: Rank and Homogeneous Systems · 3.01: Matrix Arithmetic · 3.06: The Identity and Inverses