Field (mathematics)

related topics
{math, number, function}
{theory, work, human}
{style, bgcolor, rowspan}
{math, energy, light}

In abstract algebra, a field is an algebraic structure with notions of addition, subtraction, multiplication, and division, satisfying certain axioms. The most commonly used fields are the field of real numbers, the field of complex numbers, and the field of rational numbers, but there are also finite fields, fields of functions, various algebraic number fields, p-adic fields, and so forth.

Any field may be used as the scalars for a vector space, which is the standard general context for linear algebra. The theory of field extensions (including Galois theory) involves the roots of polynomials with coefficients in a field; among other results, this theory leads to impossibility proofs for the classical problems of angle trisection and squaring the circle with a compass and straightedge, as well as a proof of the Abel–Ruffini theorem on the algebraic insolubility of quintic equations. In modern mathematics, the theory of fields (or field theory) plays an essential role in number theory and algebraic geometry.

As an algebraic structure, every field is a ring, but not every ring is a field. The most important difference is that fields allow for division (though not division by zero), while a ring need not possess multiplicative inverses. Also, the multiplication operation in a field is required to be commutative. A ring in which division is possible but commutativity is not assumed (such as the quaternions) is called a division ring or skew field. (Historically, division rings were sometimes referred to as fields, while fields were called “commutative fields”.)

As a ring, a field may be classified as a specific type of integral domain, and can be characterized by the following (not necessarily exhaustive) chain of class inclusions:

Contents

Full article ▸

related documents
Bernoulli number
Binary search algorithm
Fibonacci number
Computer numbering formats
Distribution (mathematics)
Mandelbrot set
Spinor
Trigonometric functions
Linked list
System of linear equations
Prolog
Quadratic reciprocity
Laplace transform
Relational model
Combinatory logic
Linear programming
History of mathematics
Big O notation
C++
Wikipedia:Free On-line Dictionary of Computing/R - S
Turing machine
Red-black tree
Banach–Tarski paradox
Formal power series
Lebesgue integration
Number
Forth (programming language)
Lambda calculus
P-adic number
Determinant