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- Delsarte–Goethals code
- Delta-function
- Delta-function method
- Delta-sigma-operation
- Delta amplitude
- Deming, W. Edwards
- Demographic analysis stochastic approach
- Demoulin quadrilateral
- Demoulin surface
- Demoulin theorem
- Dempster-Shafer theory
- Dempster–Shafer theory
- Dendrite
- Dendritic manifold
- Dendroid
- Denjoy-Luzin theorem
- Denjoy-Perron integral
- Denjoy-Wolff theorem
- Denjoy integral
- Denjoy theorem on derivatives
- Denjoy–Luzin theorem
- Denjoy–Perron integral
- Denjoy–Wolff theorem
- Denominator
- Denotant
- Dense-in-itself set
- Dense ordered set
- Dense set
- Density (of a topological space)
- Density hypothesis
- Density matrix
- Density method
- Density of a measure
- Density of a probability distribution
- Density of a sequence
- Density of a set
- Density point
- Density theorems
- Density topology
- Denumerable set
- Denumerant
- Depth-first search
- Depth of a module
- Derangement
- Derivability
- Derivable rule
- Derivation, logical
- Derivation in a ring
- Derivation rule
- Derivation tree
- Derivations, module of
- Derivative
- Derived automorphism
- Derived category
- Derived category test
- Derived functor
- Derived group
- Derived rule
- Derived set
- Derogatory matrix
- Desargues assumption
- Desargues geometry
- Descartes number
- Descartes oval
- Descartes theorem
- Descendant subgroup
- Descending chain condition
- Descent, method of
- Descriptive geometry
- Descriptive set theory
- Design of experiments
- Design with mutually orthogonal resolutions
- Desorienting path
- Determinant
- Determinant variety
- Developable surface
- Deviation of an approximating function
- Deviator
- Deviatoric tensor
- Devil's staircase
- Diacaustic
- Diagonal
- Diagonal continued fraction
- Diagonal group
- Diagonal matrix
- Diagonal operator
- Diagonal process
- Diagonal product of mappings
- Diagonal relation
- Diagonal ring
- Diagonal subgroup
- Diagonal theorem
- Diagonalizable algebraic group
- Diagram
- Diagram(2)
- Diagram geometry
- Diagram of functional elements
- Diagram reducibility
- Diameter
- Dichotomy
- Dichotomy method
- Dickman-function(2)
- Dickman function
- Dickson algebra
- Dickson group
- Dickson invariant
- Dickson polynomial
- Dicyclic group
- Dieudonne module
- Dieudonné module
- Diffeomorphism
- Difference-element-in-K-theory
- Difference-set(2)
- Difference cochain and chain
- Difference equation
- Difference methods
- Difference of two sets
- Difference operator
- Difference scheme
- Difference scheme, variational
- Difference scheme, viscosity of a
- Difference schemes, theory of
- Difference set
- Differentiability of solutions (of differential equations)
- Differentiable function
- Differentiable manifold
- Differentiable vector in a representation space
- Differential
- Differential-algebra(2)
- Differential-delay equation
- Differential-difference equation
- Differential-functional equation
- Differential-geometric structure
- Differential algebra
- Differential binomial
- Differential calculus
- Differential calculus (on analytic spaces)
- Differential comitant
- Differential entropy
- Differential equation, abstract
- Differential equation, ordinary
- Differential equation, partial
- Differential equation, partial, Fischer-Riesz (Picone) method
- Differential equation, partial, Fischer–Riesz (Picone) method
- Differential equation, partial, complex-variable methods
- Differential equation, partial, data on characteristics
- Differential equation, partial, discontinuous coefficients
- Differential equation, partial, discontinuous initial (boundary) conditions
- Differential equation, partial, free boundaries
- Differential equation, partial, functional methods
- Differential equation, partial, oblique derivatives
- Differential equation, partial, of the first order
- Differential equation, partial, of the second order
- Differential equation, partial, variational methods
- Differential equation, partial, with singular coefficients
- Differential equation with total differential
- Differential equations, infinite-order system of
- Differential equations, ordinary, approximate methods of solution of
- Differential equations, ordinary, retarded
- Differential equations, ordinary, with distributed arguments
- Differential equations on a torus
- Differential equations with small parameter
- Differential field
- Differential form
- Differential games
- Differential geometry
- Differential geometry in statistical inference
- Differential geometry of manifolds
- Differential graded algebra
- Differential group
- Differential inclusion
- Differential inequality
- Differential invariant
- Differential neighbourhood
- Differential on a Riemann surface
- Differential operator
- Differential operator on a module
- Differential parameter
- Differential ring
- Differential topology
- Differentiation
- Differentiation, numerical
- Differentiation along the flow of a dynamical system
- Differentiation of a mapping
- Differentiation of measures
- Diffraction, mathematical theory of
- Diffusion approximation
- Diffusion equation
- Diffusion methods
- Diffusion process
- Digon
- Dihedral angle
- Dihedral group
- Dihedron group
- Dijkstra algorithm
- Dilatation
- Dilatation mapping
- Diliberto-Straus algorithm
- Diliberto–Straus algorithm
- Dilution of a series
- Dilworth number
- Dilworth theorem
- Dimension
- Dimension, additive properties of
- Dimension function
- Dimension invariant
- Dimension of a partially ordered set
- Dimension polynomial
- Dimension theory
- Dimensional analysis
- Dini-Lipschitz criterion
- Dini criterion
- Dini derivative
- Dini theorem
- Dini–Lipschitz criterion
- Dinostratus quadratrix
- Dioid
- Diophantine analysis
- Diophantine approximation, metric theory of
- Diophantine approximation, problems of effective
- Diophantine approximations
- Diophantine equations
- Diophantine equations, solvability problem of
- Diophantine geometry
- Diophantine predicate
- Diophantine problems of additive type
- Diophantine set
- Dirac algebra
- Dirac delta-function
- Dirac distribution
- Dirac equation
- Dirac matrices
- Dirac monopole
- Dirac quantization
- Dirac spinor
- Direct complement
- Direct counting
- Direct method
- Direct product
- Direct sum
- Directed graph
- Directed order
- Directed set
- Directing functionals, method of
- Direction field
- Directrix
- Dirichlet-L-function
- Dirichlet-function
- Dirichlet L-function
- Dirichlet Laplacian
- Dirichlet algebra
- Dirichlet boundary conditions
- Dirichlet box principle
- Dirichlet character
- Dirichlet convolution
- Dirichlet criterion (convergence of series)
- Dirichlet density
- Dirichlet discontinuous multiplier
- Dirichlet distribution
- Dirichlet eigenvalue
- Dirichlet formula
- Dirichlet integral
- Dirichlet kernel
- Dirichlet polynomial
- Dirichlet principle
- Dirichlet problem
- Dirichlet process
- Dirichlet series
- Dirichlet series for an analytic almost-periodic function
- Dirichlet tesselation
- Dirichlet theorem
- Dirichlet variational problem
- Disc
- Disc, topological
- Disc of convergence
- Disclosure
- Disconcugacy
- Disconjugacy
- Discontinuity point
- Discontinuous function
- Discontinuous multiplier
- Discontinuous variational problem
- Discrepancy
- Discrepancy of an approximation
- Discrete analysis
- Discrete category
- Discrete direct product
- Discrete distribution
- Discrete event system
- Discrete family of sets
- Discrete group of transformations
- Discrete logarithm
- Discrete measure
- Discrete norm
- Discrete order
- Discrete programming
- Discrete response models
- Discrete series (of representations)
- Discrete space
- Discrete space-time
- Discrete subgroup
- Discrete systems in statistical mechanics
- Discrete topology
- Discrete valuation ring
- Discretely-normed ring
- Discretization method
- Discriminant
- Discriminant analysis
- Discriminant curve
- Discriminant function
- Discriminant informant
- Discriminant tensor
- Disjoint sum of partially ordered sets
- Disjoint union
- Disjunction
- Disjunctive complement
- Disjunctive elements
- Disjunctive family of sets
- Disjunctive normal form
- Disjunctive representations
- Disjunctive sum
- Disjunctive word
- Dismantable set
- Dispersion
- Dispersion analysis
- Dispersion ellipsoid
- Dispersion equation
- Dispersion method
- Dispersion point
- Dispersion proportion
- Dispersion relation
- Dispersive space
- Displacement structure
- Dissipative function
- Dissipative operator
- Dissipative system
- Distal dynamical system
- Distance-regular graph
- Distance-weighted mean
- Distinguished class of extensions
- Distortion theorems
- Distribution
- Distribution, type of
- Distribution fitting by using the mean of distances of empirical data
- Distribution function