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Sum
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== 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 β X and g : Z β 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
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