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Domain (mathematical analysis), an open connected set •
Domain (ring theory), a non-trivial ring without left or right nonzero zero divisors •
Integral domain, a non-trivial commutative ring without nonzero zero divisors •
Atomic domain, an integral domain in which every nonzero non-unit is a finite product of irreducible elements •
Bézout domain, an integral domain in which the sum of two principal ideals is again a principal ideal •
Euclidean domain, an integral domain which allows a suitable generalization of the Euclidean algorithm •
Dedekind domain, an integral domain in which every nonzero proper ideal factors into a product of prime ideals •
GCD domain, an integral domain in which every two non-zero elements have a greatest common divisor •
Principal ideal domain, an integral domain in which every ideal is principal •
Unique factorization domain, an integral domain in which every non-zero element can be written as a product of irreducible elements in essentially a unique way •
Domain of a function, the set of input values for which the (total) function is defined •
Domain of definition of a partial function •
Natural domain of a partial function •
Domain of holomorphy of a function • Domain of an
algebraic structure, the set on which the algebraic structure is defined •
Domain of discourse, the set of entities over which logic variables may range •
Domain theory, the study of certain subsets of continuous lattices that provided the first denotational semantics of the lambda calculus •
Frequency domain, the analysis of mathematical functions with respect to frequency, rather than time •
Fundamental domain, subset of a space that contains exactly one point from each orbit of the action of a symmetry group •
Time domain, the analysis of mathematical functions with respect to time == Information technology ==