Sum most commonly means the total of two or more numbers added together; see

addition Addition (usually signified by the Plus and minus signs#Plus sign, plus symbol ) is one of the four basic Operation (mathematics), operations of arithmetic, the other three being subtraction, multiplication and Division (mathematics), division. ...

. Sum can also refer to:

Mathematics

Sum (category theory) In category theory, the coproduct, or categorical sum, is a construction which includes as examples the disjoint union of sets and of topological spaces, the free product of groups, and the direct sum of modules and vector spaces. The coproduc ...

, the generic concept of summation in mathematics * Sum, the result of

summation In mathematics, summation is the addition of a sequence of any kind of numbers, called ''addends'' or ''summands''; the result is their ''sum'' or ''total''. Beside numbers, other types of values can be summed as well: functions, vectors, mat ...

, the addition of a sequence of numbers *

3SUM In computational complexity theory, the 3SUM problem asks if a given set of n real numbers contains three elements that sum to zero. A generalized version, ''k''-SUM, asks the same question on ''k'' numbers. 3SUM can be easily solved in O(n^2) t ...

, a term from computational complexity theory *

Band sum In geometric topology, a band sum of two ''n''-dimensional knots ''K''1 and ''K''2 along an (''n'' + 1)-dimensional 1-handle ''h'' called a ''band'' is an ''n''-dimensional knot ''K'' such that: * There is an (''n'' + 1)-dimen ...

, a way of connecting mathematical knots * Connected sum, a way of gluing manifolds * Digit sum, in number theory *

Direct sum The direct sum is an operation between structures in abstract algebra, a branch of mathematics. It is defined differently, but analogously, for different kinds of structures. To see how the direct sum is used in abstract algebra, consider a more ...

, a combination of algebraic objects ** Direct sum of groups ** Direct sum of modules **

Direct sum of permutations In combinatorics, the skew sum and direct sum of permutations are two operations to combine shorter permutations into longer ones. Given a permutation ''π'' of length ''m'' and the permutation ''σ'' of length ''n'', the skew sum of ''π'' and '' ...

** Direct sum of topological groups * Einstein summation, a way of contracting tensor indices * Empty sum, a sum with no terms *

Indefinite sum In discrete calculus the indefinite sum operator (also known as the antidifference operator), denoted by \sum _x or \Delta^ , is the linear operator, inverse of the forward difference operator \Delta . It relates to the forward difference operator ...

, the inverse of a finite difference *

Kronecker sum In mathematics, the Kronecker product, sometimes denoted by ⊗, is an operation on two matrices of arbitrary size resulting in a block matrix. It is a generalization of the outer product (which is denoted by the same symbol) from vectors to m ...

, an operation considered a kind of addition for matrices * Matrix addition, in linear algebra * Minkowski addition, a sum of two subsets of a vector space * Power sum symmetric polynomial, in commutative algebra * Prefix sum, in computing * Pushout (category theory) (also called an amalgamated sum or a cocartesian square, fibered coproduct, or fibered sum), the colimit of a diagram consisting of two morphisms f : Z → X and g : Z → Y with a common domainor pushout, leading to a fibered sum in category theory * QCD sum rules, in quantum field theory * Riemann sum, in calculus * Rule of sum, in combinatorics * Subset sum problem, in cryptography *

Sum rule in differentiation This is a summary of differentiation rules, that is, rules for computing the derivative of a function in calculus. Elementary rules of differentiation Unless otherwise stated, all functions are functions of real numbers (R) that return real ...

, in calculus *

Sum rule in integration In mathematics, an integral assigns numbers to functions in a way that describes displacement, area, volume, and other concepts that arise by combining infinitesimal data. The process of finding integrals is called integration. Along with ...

, in calculus *

Sum rule in quantum mechanics In quantum mechanics, a sum rule is a formula for transitions between energy levels, in which the sum of the transition strengths is expressed in a simple form. Sum rules are used to describe the properties of many physical systems, including soli ...

* Wedge sum, a one-point union of topological spaces * Whitney sum, of fiber bundles * Zero-sum problem in combinatorics

Computing and technology

Sum (Unix) is a legacy utility available on some Unix and Unix-like operating systems. This utility outputs a 16-bit checksum of each argument file, as well as the number of blocks they take on disk. — manual pages from GNU coreutils Two different check ...

, a program for generating checksums *

StartUp-Manager GNU GRUB (short for GNU GRand Unified Bootloader, commonly referred to as GRUB) is a boot loader package from the GNU Project. GRUB is the reference implementation of the Free Software Foundation's Multiboot Specification, which provides a ...

, a program to configure GRUB, GRUB2, Usplash and Splashy *

Sum type In computer science, a tagged union, also called a variant, variant record, choice type, discriminated union, disjoint union, sum type or coproduct, is a data structure used to hold a value that could take on several different, but fixed, types. O ...

, a computer science term

Art and entertainment

* Sum, the first beat (pronounced like "some") in any rhythmic cycle of Hindustani classical music * "Sum", a song by Pink Floyd from '' The Endless River'' * '' Sum: Forty Tales from the Afterlives'', a 2009 collection of short stories by David Eagleman *

Sum 41 Sum 41 is a Canadian rock band from Ajax, Ontario. Originally called Kaspir, the band was formed in 1996 and currently consists of Deryck Whibley (lead vocals, guitars, keyboards), Dave Baksh (lead guitar, backing vocals), Jason "Cone" McCas ...

, a Canadian punk band * SUM, the computer in ''

Goat Song (novelette) "Goat Song" is a science fiction novelette by American writer Poul Anderson. Originally published in ''The Magazine of Fantasy and Science Fiction'' issue of February 1972, it was later included in the anthologies '' Nebula Award Stories Eight'' ...

'' story by Poul Anderson in ''

Magazine of Fantasy and Science Fiction ''The Magazine of Fantasy & Science Fiction'' (usually referred to as ''F&SF'') is a U.S. fantasy fiction magazine, fantasy and science fiction magazine first published in 1949 by Mystery House, a subsidiary of Lawrence E. Spivak, Lawrence Spiva ...

'', (1972).

Organizations

* ''Senter for utvikling og miljø'' ( Centre for Development and the Environment), a research institute which is part of the University of Oslo * Soccer United Marketing, the for-profit marketing arm of Major League Soccer and the exclusive marketing partner of the United States Soccer Federation *

Society for the Establishment of Useful Manufactures The Society for Establishing Useful Manufactures (S.U.M.) or Society for the Establishment of Useful Manufactures was a private state-sponsored corporation founded in 1791 to promote industrial development along the Passaic River in New Jersey i ...

, a now-defunct private state-sponsored corporation founded in 1791 to promote industrial development along the Passaic River in New Jersey in the United States *

The State University of Management The State University of Management is a public university in Moscow, Russia. It was founded in 1919. Its rector is Ivan Vasilyevich Lobanov. There are more than 250 professors and 12 academics and members of the Russian Academy of Sciences workin ...

, a Russian university * Save Uganda Movement, a Ugandan militant opposition group

Places

* Sum (administrative division), an administrative division in Mongolia, China and some areas of Russia **

Sum (Mongolia) A district ( mn, сум, , , ; "arrow"), is a second level administrative subdivision of Mongolia. The 21 Provinces of Mongolia are divided into 331 districts.Montsame News Agency. ''Mongolia''. 2006, Foreign Service office of Montsame News A ...

, , an administrative division in Mongolia * SUM, the IATA airport code for the

Sumter Airport Sumter Airport is a public use airport located four nautical miles (7 km) north of the central business district of Sumter, a city in Sumter County, South Carolina, United States. The airport is owned and operated by the Sumter County unde ...

in Sumter County, South Carolina, USA

Other uses

* Sum, an old name for the Finns in East Slavic languages, derived from the word Suomi, "Finland" *

Soum (currency) The som, sum, or soum is a unit of currency used in Turkic-speaking countries in Central Asia. Its name comes from words in the respective languages (including Kazakh, Kyrgyz, Uyghur and Uzbek) for "pure", referring to historical coins of pur ...

(also spelled "sum"), a unit of currency used in some Turkic-speaking countries of Central Asia * SUM (interbank network), an interbank network in forty-two U.S. state * SUM, the ISO 639-3 code for the Sumo language * Cen (surname), sometimes Romanized Sum * '' ''Cogito, ergo sum'', Latin for: "I think, therefore I am" *

Sum certain A sum certain is a specified and set amount of money owed by one person to another. It is a legal term of art, having specialized meaning in the law. Some kinds of legal claims can not be brought at all unless the sum certain can be pleaded. A docum ...