Curated OER
Union and Intersection of Sets
In this Algebra I/Algebra II worksheet, students determine the intersection and union of sets and solve problems with Venn diagrams. The three page worksheet contains a combination of seventeen multiple choice and free response...
Wolfram Research
Wolfram Math World: Sets
This page discusses sets and set theory in mathematics and probability, and it discusses the notation and properties of sets.
Wolfram Research
Wolfram Math World: Foundations of Mathematics: Topics
This math tutorial site covers set theory, axioms, category theory, logic, mathematical problems, and point-set topology.
Other
Earlham College: A Crash Course in Infinite Sets
This site aims to provide all essential information on infinite sets in a way the reader will immediately understand.
University of Illinois
University of Illinois Urbana Champaign: Union of Sets
A straightforward site that teaches the meaning of set union. Very easy to understand!
Brown University
Brown University: Seeing Theory
This resource provides interactive visualizations of probability concepts. Covers basic probability, compound probability, probability distributions, frequentist inference, Bayesian inference, and regression analysis. The authors are...
University of St. Andrews (UK)
University of St. Andrews: Beginnings of Set Theory
The University of St. Andrews offers a wonderful introduction to set theory that makes the topic interesting and understandable. Includes numerous links to related philosophers, mathematicians, and topics.
Houghton Mifflin Harcourt
Holt, Rinehart and Winston: Homework Help Independent Practice: Sets
Get independent practice working with sets. Each incorrect response gets a text box explanation and another try. Correct responses are confirmed.
TED Talks
Ted: Ted Ed: How Big Is Infinity?
Explore the concept of infinity using the fundamentals of set theory in this animated video. [7:13]
Other
Julia Sets, Complex Deterministic Fractals
Here's an example of "What a 2 Dimensional Julia Set will look like using modern computers with their sophisticated graphical displays." Gaston Julia published his theories long before computers and as the site's author remarks, "What a...
Other
The Iterative Conception of Set
Conceptual explanation of set theory and the logical foundations of mathematics. Written clearly and avoids technical notation.
Other
Appalachian State University: Sets and Bags
This page provides extensive information about sets and bags. Includes descriptive set notation and examples.
Stanford University
Stanford Encyclopedia of Philosophy: Category Theory
Explains major concepts in "category theory," a common alternative to traditional set theory. Some familiarity with the logical notation is assumed. Article does include sections on the history and general philosophical significance of...
Stanford University
Stanford Encyclopedia of Philosophy: Russell's Paradox
Explains briefly the history and significance of Russell's famous logical paradox. Includes links to other Russell-related websites. Uses a minimum of technical notation.
OpenStax
Open Stax: Catherine Schmidt Jones: Keys and Scales Are Sets
Help your students identify sets and intersections of sets with this musical activity. Using the concept of key signatures, students will learn that scales are sets of notes. Included with this lesson plan are downloadable worksheets and...
University of St. Andrews (UK)
University of St. Andrews: History of Set Theory
This page, which is provided for by the University of St. Andrews, traces the history of Set Theory as well as the concept of infinity and the infinite set.
CK-12 Foundation
Ck 12: Precalculus Concepts 2.0
A complete high school Precalculus Concepts course. Includes 'Related Modalities' for each lesson that teach the same concept in different ways. The text materials follows Algebra II and comes before Calculus or Statistics. The content...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Rational Numbers
Math Forum response addressing how many elements are in the set of rational numbers. Responses investigate the countability of sets, and how sets with an infinite number of elements can be counted and compared to other "infinite sets."
Houghton Mifflin Harcourt
Holt, Rinehart and Winston: Homework Help Independent Practice: Intersection and Union of Sets
Get independent practice working with the intersection and union of sets. Each incorrect response gets a text box explanation and another try. Correct responses are confirmed.
Math Aids
Math Aids: Venn Diagram Worksheets
Great resource to practice and strengthen math skills pertaining to Venn Diagrams. Math worksheets are printable, may be customized, and include answer keys.