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** Differential topology, in multivariable calculus, the differential of a smooth map between Euclidean spaces or differentiable manifolds is the approximating linear map between the tangent spaces, called pushforward ( differential )
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** and Differential
** Differential nonlinearity ( DNL ) shows how much two adjacent code analog values deviate from the ideal 1 LSB step.
** and topology
** In the product topology, the closure of a product of subsets is equal to the product of the closures.
** In topology, morphisms between topological spaces are called continuous maps, and an automorphism of a topological space is a homeomorphism of the space to itself, or self-homeomorphism ( see homeomorphism group ).
** The set of infinite strings is the inverse limit of the set of finite strings, and is thus endowed with the limit topology.
** Cover ( topology ), a system of ( usually, open or closed ) sets whose union is a given topological space
** In geographic information systems and their data structures, the terms " topology " and " planar enforcement " are used to indicate that the border line between two neighboring areas ( and the border point between two connecting lines ) is stored only once.
** Also in cartography, a topological map is a much simplified map that preserves the mathematical topology while sacrificing scale and shape
** triangulation ( topology ), generalizations to topological spaces other than R < sup > d </ sup >
** and calculus
** A variable for a 2-dimensional region in calculus, usually corresponding to the domain of a double integral.
** William Rowan Hamilton discovers the calculus of quaternions and deduces that they are non-commutative.
** Real analysis on time scales – a unification of real analysis with calculus of finite differences
** Time scale calculus, the unification of the theory of difference equations with differential equations
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