Sum

Sum may refer to:

Mathematics

Summation, the addition of a sequence of numbers
Addition, the elementary mathematical operations of arithmetic that totals amount of quantities combined
Sum (category theory), the generic concept of summation in mathematics
Additive and preadditive category
Band sum, a way of connecting knots
Connected sum, a way of gluing manifolds
Digit sum, in number theory
Direct sum, a combination of algebraic objects
- Direct sum of groups
- Direct sum of topological groups
- Direct sum of modules
- Direct sum of permutations
Einstein summation, a way of contracting tensor indecies
Empty sum, a sum with no terms
Fibered sum or pushout in category theory
Indefinite sum, the inverse of a finite difference
Matrix addition, in linear algebra
QCD sum rules, in quantum field theory
Power sum, in commutative algebra
Prefix sum, in computing
Riemann sum, in calculus
Rule of sum in combinatorics
Subset sum problem, in cryptography
Sum rule in differentiation in calculus
Sum rule in integration in calculus
Sum rule in quantum mechanics
Wedge sum, a one-point union of topological spaces
Whitney sum of fiber bundles
Zero-sum problem in combinatorics
3SUM, a term from computational complexity theory

Sum, an old name for the Finns in East Slavic languages, derived from the word Suomi, "Finland"
Sum: Forty Tales from the Afterlives, a 2009 collection of short stories by David Eagleman
Sum (Unix), a program for generating checksums
Sum (country subdivision), an administrative division in Mongolia and nearby regions
the local term for one of the districts of Mongolia
Som (currency), the unit of currency used in Turkic-speaking countries of Central Asia
the IATA airport code for the Sumter Airport in Sumter County, South Carolina, USA
the ISO 639-3 code for the Sumo language
the first beat (pronounced like "some") in any rhythmic cycle of Hindustani classical music
"Sum", a song by Pink Floyd from The Endless River

As an acronym, SUM may refer to: