Wolfram Math World

Comprehensive encyclopedia of mathematics with 13,000 detailed entries. Continually updated, extensively illustrated, and with interactive examples. Learn about the history, terminology, and foundations of mathematics from Wolfram MathWorld, a comprehensive online resource for mathematics.

Explore the diverse topics, applications, and approaches of mathematics with Wolfram Alpha and references. Wolfram Alpha brings expert. Explore a variety of math courses and resources offered by Wolfram MathWorld to enhance your mathematical knowledge and skills.

MathWorld is the web's most extensive mathematical resource, assembled by Eric W. Weisstein and others for over 25 years. It covers all levels of mathematics and uses Wolfram Mathematica for its content and design.

MathWorld is a comprehensive and free online encyclopedia of mathematics, created and written by Eric W. Weisstein. It is sponsored by Wolfram Research, Inc.

and has a history of legal disputes with CRC Press. The term "math" is the usual term for "mathematics" used in the United States. In contrast, the term "maths" is used in the United Kingdom.

Geometry is the study of figures in different dimensions and types of spaces. Learn about the history, types, and applications of geometry, with examples, references, and interactive features from Wolfram MathWorld. About MathWorld MathWorld Classroom Contribute MathWorld Book 13,281 Entries Last Updated: Wed Dec 3 2025 ©1999-2025 Wolfram Research, Inc.

Terms of Use wolfram.com Wolfram for Education Created, developed and nurtured by Eric Weisstein at Wolfram Research. A square root of x is a number r such that r^2=x. When written in the form x^(1/2) or especially sqrt(x), the square root of x may also be called the radical or surd.

The square root is therefore an nth root with n=2. Note that any positive real number has two square roots, one positive and one negative. For example, the square roots of 9 are -3 and +3, since (-3)^2=(+3)^2=9.

Any nonnegative.