Editing Sum (section)

== Mathematics ==

* [[Sum (category theory)]], the generic concept of summation in mathematics
* Sum, the result of [[summation]], the addition of a sequence of numbers
* [[3SUM]], a term from computational complexity theory
* [[Band sum]], a way of connecting mathematical 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 modules]]
** [[Direct sum of permutations]]
** [[Direct sum of topological groups]]
* [[Einstein summation]], a way of contracting tensor indices
* [[Empty sum]], a sum with no terms
* [[Indefinite sum]], the inverse of a finite difference
* [[Kronecker sum]], 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]], 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