Topics in mathematics
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- D-moduleModule over a sheaf of differential operators
- D'Alembert operatorSecond-order differential operator
- Dagger categoryCategory equipped with involution
- Daniel GorensteinDaniel E. Gorenstein (January 1, 1923 – August 26, 1992) was an American mathematician bes
- Daniel QuillenAmerican mathematician (1940–2011)
- Daniel ShanksDaniel Charles Shanks (January 17, 1917 – September 6, 1996) was an American mathematician
- Darboux integralIntegral constructed using Darboux sums
- Darboux's theoremFoundational result in symplectic geometry
- Darboux's theorem (analysis)All derivatives have the intermediate value property
- David Allen HoffmanDavid Allen Hoffman is an American mathematician whose research concerns differential geom
- David ConlonDavid Conlon (born 1982) is an Irish mathematician who is a Professor of Mathematics at th
- David H. Bailey (mathematician)David Harold Bailey (born 14 August 1948) is a mathematician and computer scientist. He re
- David MumfordAmerican mathematician (born 1937)
- De Branges's theoremStatement in complex analysis; formerly the Bieberbach conjecture
- De quinque corporibus regularibus15th-century book on polyhedra
- De Rham cohomologyCohomology with real coefficients computed using differential forms
- Decade (log scale)One decade (symbol dec) is a unit for measuring ratios on a logarithmic scale, with one de
- Decision EXpertDEX (Decision EXpert) is a qualitative multi-criteria decision analysis (MCDA) method for
- Decision matrixList of values for comparison
- Decision-making softwareDecision-making software (DM software) is software for computer applications that help ind
- Decomposition of a moduleIn abstract algebra, a decomposition of a module is a way to write a module as a direct su
- Decomposition of spectrum (functional analysis)Construction in functional analysis, useful to solve differential equations
- Dedekind cutMethod of construction of the real numbers
- Dedekind domainAlgebra with unique prime factorization
- Dedekind eta functionMathematical function
- Deduction theoremMetatheorem in mathematical logic
- Defective matrixNon-diagonalizable matrix; one lacking a basis of eigenvectors
- Deficient numberNumber that is more than the sum of its proper divisors
- Definable setTerm in mathematical logic
- Definite matrixProperty of a mathematical matrix
- Definite quadratic formIn mathematics, a definite quadratic form is a quadratic form over some real vector space
- Definitions of mathematicsMathematics has no generally accepted definition. Different schools of thought, particular
- Deformation (mathematics)Branch of mathematics
- Degeneracy (graph theory)Measurement of graph sparsity
- Degeneracy (mathematics)Limiting case which is different from the rest of the class
- Degenerate bilinear formConcept in linear algebra
- Degree distributionConcept in network science
- Degree of a continuous mappingConcept in topology
- Degree of an algebraic varietyNumber used in algebraic geometry
- Degrees of freedom (statistics)Number of values in the final calculation of a statistic that are free to vary
- Dehn surgeryOperation used to modify three-dimensional topological spaces
- Dehn–Sommerville equationsIn mathematics, the Dehn–Sommerville equations are a complete set of linear relations betw
- Del in cylindrical and spherical coordinatesMathematical gradient operator in certain coordinate systems
- Delaunay triangulationTriangulation method
- Deligne–Lusztig theoryTechnique in mathematical group theory
- Delone setWell-spaced set of points in a metric space
- Dennis SullivanDennis Parnell Sullivan (born February 12, 1941) is an American mathematician known for hi
- Dense orderType of ordering of a set
- Dense setSubset whose closure is the whole space
- Densely defined operatorIn mathematics – specifically, in operator theory – a densely defined operator or partiall
- Density estimationEstimate of an unobservable underlying probability density function
- Dependency graphDirected graph representing dependencies
- Dependency networkNetwork analysis approach
- Derivation (differential algebra)Algebraic generalization of the derivative
- Derivative testMethod for finding the extrema of a function
- Derived categoryHomological construction
- Derived functorHomological construction in category theory
- Derived schemeIn algebraic geometry, a derived scheme is a homotopy-theoretic generalization of a scheme
- Desargues graphDistance-transitive cubic graph with 20 nodes and 30 edges
- Desargues's theoremTheorem in projective geometry
- Descartes' rule of signsCounting polynomial real roots based on coefficients
- Descendant tree (group theory)In mathematics, specifically group theory, a descendant tree is a hierarchical structure t
- Descent (mathematics)Mathematical concept that extends the intuitive idea of gluing in topology
- Descriptive complexity theoryBranch of mathematical logic
- Descriptive geometryBranch of geometry
- Descriptive set theorySubfield of mathematical logic
- Désiré AndréFrench mathematician (1840–1917)
- Destructive dilemmaRule of inference of propositional logic
- DeterminacySubfield of set theory
- Determinantal varietyIn algebraic geometry, determinantal varieties are spaces of matrices with a given upper b
- Devanagari numeralsSymbols used for numbers in Devanagari
- DiagonalIn geometry a line segment joining two nonconsecutive vertices of a polygon or polyhedron
- Diagonalizable matrixMatrices similar to diagonal matrices
- Diagram (category theory)Indexed collection of objects and morphisms in a category
- DiameterStraight line segment that passes through the centre of a circle
- Dicaearchus4th-century BC Greek philosopher and geographer
- Dichromatic symmetryTwo-colour symmetry (examples, history and dimensional counts)
- Dieter KotschickDieter Kotschick (born 1963) is a German mathematician, specializing in differential geome
- Dieudonné moduleModule over the non-commutative Dieudonné ring
- DiffeomorphismIsomorphism of differentiable manifolds
- Difference quotientExpression in calculus
- Differentiable curveStudy of curves from a differential point of view
- Differentiable stackConcept in differential geometry
- Differentiable vector-valued functions from Euclidean spaceDifferentiable function in functional analysis
- Differential algebraAlgebraic study of differential equations
- Differential forms on a Riemann surfaceConformal structure admits a Hodge dual of 1-forms without even specifying a metric
- Differential Galois theoryStudy of Galois symmetry groups of differential fields
- Differential gameConcept in game theory
- Differential geometry of surfacesMathematics of smooth surfaces
- Differential graded algebraAlgebraic structure in homological algebra
- Differential of a functionNotion in calculus
- Differential topologyBranch of mathematics
- Differentiation in Fréchet spacesMathematical concept
- Diffie–Hellman problemProblem in cryptography
- Dihedral groupGroup of symmetries of a regular polygon
- Dilworth's theoremOn chains and antichains in partial orders
- Dimension (vector space)Number of vectors in any basis of the vector space
- Dimension of a schemeIn algebraic geometry, the dimension of a scheme is a generalization of the dimension of a
- Dimension of an algebraic varietyMeasure of a mathematical object studied in the field of algebraic geometry
- Dimension theory (algebra)Study of dimension in algebraic geometry
- Dini's theoremSufficient criterion for uniform convergence
- DinostratusAncient Greek mathematician and geometer (c. 390–320 BC)
- Diophantine approximationRational-number approximation of a real number
- Diophantine geometryMathematics of varieties with integer coordinates
- Diophantine setSolution of some Diophantine equation
- Dirac algebraClifford algebra in 4 dimensions
- Dirac bracketQuantization method for constrained Hamiltonian systems with second-class constraints
- Dirac measureMeasure that is 1 if and only if a specified element is in the set
- Direct comparison testDetermining convergence in mathematics
- Direct image functorIn mathematics, a mapping between categories
- Direct limitSpecial case of colimit in category theory
- Direct productGeneralization of the Cartesian product
- Direct product of groupsMathematical concept
- Direct sumAlgebraic structure formed from a collection of algebraic structures
- Direct sum of groupsMeans of constructing a group from two subgroups
- Direct sum of modulesOperation in abstract algebra
- Directed setMathematical ordering with upper bounds
- Direction cosineCosines of the angles between a vector and the coordinate axes
- Dirichlet distributionProbability distribution
- Dirichlet L-functionType of mathematical function
- Dirichlet-multinomial distributionDistributions in probability theory
- Dirichlet's principleConcept in potential theory
- Dirichlet's unit theoremGives the rank of the group of units in the ring of algebraic integers of a number field
- Discrepancy theoryTheory of irregularities of distribution
- Discrete calculusDiscrete (i.e., incremental) version of infinitesimal calculus
- Discrete Chebyshev polynomialsIn mathematics, discrete Chebyshev polynomials, or Gram polynomials, are a type of discret
- Discrete cosine transformTechnique used in signal processing and data compression
- Discrete Fourier transformFunction in discrete mathematics
- Discrete Fourier transform over a ringGeneralisation of Fourier transform to any ring
- Discrete geometryBranch of geometry that studies combinatorial properties and constructive methods
- Discrete groupType of topological group
- Discrete measureIn mathematics, more precisely in measure theory, a measure on the real line is called a d
- Discrete series representationType of group representation for locally compact groups
- Discrete spaceType of topological space
- Discrete spectrum (mathematics)Set of isolated points in the spectrum of an operator with finite-rank Riesz projectors
- Discrete valuationIn mathematics, a discrete valuation is an integer valuation on a field K; that is, a func
- Discrete valuation ringConcept in abstract algebra
- Discrete wavelet transformTransform in numerical harmonic analysis
- Discrete-time Markov chainProbability concept
- DiscriminantFunction of the coefficients of a polynomial that gives information on its roots
- Disjoint setsSets with no element in common
- Disjoint unionIn mathematics, operation on sets
- Disk (mathematics)Plane figure, bounded by circle
- Distance (graph theory)Length of shortest path between two nodes of a graph
- Distance from a point to a planeLength in solid geometry
- Distance setSet of distances defined from a set of points
- Distribution (differential geometry)Subbundle of the tangent bundle
- Distribution (mathematical analysis)Objects that generalize functions
- Distribution function (measure theory)In mathematics, in particular in measure theory, there are different notions of distributi
- Distributive latticeSpecial type of lattice
- Divergence of the sum of the reciprocals of the primesTheorem in number theory
- Divided power structureIn mathematics, specifically commutative algebra, a divided power structure is a way of in
- Division algebraAlgebra over a field with only invertible elements and zero
- Division by twoIn mathematics, division by two, also called halving, mediation, or dimidiation, is common
- Division ringAlgebraic structure also called skew field
- Divisor (algebraic geometry)Generalizations of codimension-1 subvarieties of algebraic varieties
- Dobiński's formulaIn combinatorial mathematics, Dobiński's formula states that the th Bell number , the numb
- Dolbeault cohomologyMathematical term
- Domain (mathematical analysis)Connected open subset of a topological space
- Domain (ring theory)Ring without nonzero zero divisors
- Domain of discourseType of abstract object
- Domain of holomorphyConcept in complex analysis
- Dominance-based rough set approachExtension of rough set theory
- Dominated convergence theoremTheorem in measure theory
- Dominique HulinDominique Hulin (born 1959) is a French mathematician specializing in differential geometr
- Domino tilingGeometric construct
- Donald A. GilliesDonald Angus Gillies (; born 4 May 1944) is a British philosopher and historian of science
- Donald BurkholderAmerican mathematician
- Donaldson's theoremOn when a definite intersection form of a smooth 4-manifold is diagonalizable
- Doob decomposition theoremIn the theory of stochastic processes in discrete time, a part of the mathematical theory
- Doob martingaleStochastic process
- Doob's martingale convergence theoremsTheorems concerning stochastic processes
- Door spaceIn mathematics, specifically in the field of topology, a topological space is said to be a
- Dorothy Lewis BernsteinAmerican mathematician (1914–1988)
- Double hyphenIn Latin script, the double hyphen ⹀ is a punctuation mark that consists of two parallel h
- Double pendulumPendulum with another pendulum attached to its end
- Drinfeld moduleIn mathematics, a Drinfeld module (or elliptic module) is roughly a special kind of module
- DSPACEMemory space for a deterministic Turing machine
- DTIMEDeterministic time, in computational complexity theory
- Du Val singularityMathematical concept describing isolated singularity of an algebraic surface
- Dual (category theory)Correspondence between properties of a category and its opposite
- Dual abelian varietyIn mathematics, a dual abelian variety can be defined from an abelian variety A, defined o
- Dual bundleIn mathematics, the dual bundle is an operation on vector bundles extending the operation
- Dual curveCurve in the dual projective plane made from all lines tangent to a given curve
- Dual graphGraph representing faces of another graph
- Dual matroidIn matroid theory, the dual of a matroid is another matroid that has the same elements as
- Dual numberReal numbers adjoined with a nil-squaring element
- Dual polyhedronPolyhedron associated with another by swapping vertices for faces
- Dual quaternionEight-dimensional algebra over the real numbers
- Dual representationIn mathematics, if G is a group and ρ is a linear representation of it on the vector space
- Dual spaceIn mathematics, vector space of linear forms
- Duality (mathematics)General concept and operation in mathematics
- Duality (projective geometry)Concept in projective geometry
- Duffin–Schaeffer theoremMathematical theorem
- Dunham JacksonDunham Jackson (July 24, 1888 in Bridgewater, Massachusetts – November 6, 1946) was a math
- DuodecimalBase-12 numeral system
- Dyadic rationalFraction with denominator a power of two
- Dynkin diagramPictorial representation of symmetry