Set Theory

1. Kosara, Robert (2009), "A Vennerable Challenge", American Scientist 97 (January-February): 58-59.
   • "A Venn diagram is an unusual choice for data representation. It serves a very specific purpose, to show two or three sets and how they intersect. What works well to teach children the basics of set theory might not be the best for visualizing set-based data, however."

2. Using Sets to Define the Natural Numbers

3. The primitive relation of set theory is set membership (∈), which relates members of sets to the sets that they are members of.

   Can members be sets? Must members be sets?