# Interactive Word Search – Set Theory

Web page created by Crossword Compiler. Solutions | More Set Theory Puzzles | Other Puzzle Themes

Set theory is a foundational branch of mathematics that deals with collections of objects, called sets, and the relationships between these sets. Developed in the late 19th and early 20th centuries by mathematicians such as Georg Cantor and Ernst Zermelo, set theory provides a rigorous framework for defining and studying mathematical structures.

At its core, set theory revolves around the concept of a set, which is a well-defined collection of distinct objects, called elements. These elements can be anything: numbers, letters, symbols, or even other sets. Sets are typically denoted by curly braces {}, and the elements are listed within these braces, separated by commas. For example:

The set of natural numbers less than 5 can be written as {0, 1, 2, 3, 4}.

The set of vowels in the English alphabet can be written as {a, e, i, o, u}.

Sets can be finite or infinite, depending on the number of elements they contain. Sets can also be empty, meaning they contain no elements, and are denoted by the symbol ∅ or {}.