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- Individual constant
- Individual ergodic theorem
- Individual variable
- Indivisibles, method of
- Induced fibre bundle
- Induced representation
- Induced subgraph
- Induced topology
- Induction axiom
- Inductive definition
- Inductive dimension
- Inductive limit
- Inefficient statistic
- Inequality
- Inertial prime number
- Inertial system
- Inessential mapping
- Infimum
- Infinite-dimensional representation
- Infinite-dimensional space
- Infinite decimal expansion
- Infinite game
- Infinite induction
- Infinite product
- Infinitely-connected domain
- Infinitely-distant elements
- Infinitely-divisible distribution
- Infinitely-divisible distributions, factorization of
- Infinitely-large function
- Infinitely-small function
- Infinitesimal calculus
- Infinitesimal connection
- Infinitesimal deformation
- Infinitesimal operator
- Infinitesimal structure
- Infinity
- Infinity, axiom of
- Informal axiomatic method
- Informant
- Information
- Information, amount of
- Information, exactness of reproducibility of
- Information, quantization of
- Information, rate of generation of
- Information, source of
- Information, transmission of
- Information, transmission rate of
- Information-based complexity
- Information correlation coefficient
- Information distance
- Information matrix
- Information set
- Information theory
- Infra-barrelled space
- Initial conditions
- Initial object
- Initial set of a continuum
- Injection
- Injective envelope
- Injective hull
- Injective module
- Injective object
- Inner automorphism
- Inner product
- Inscribed and circumscribed figures
- Inscribed angle
- Inscribed broken line
- Instantaneous state
- Integer
- Integer programming
- Integrability
- Integrability of trigonometric series
- Integrable function
- Integrable representation
- Integrable system
- Integral
- Integral-relation method
- Integral-transform method
- Integral automorphism
- Integral calculus
- Integral closure
- Integral cosine
- Integral curve
- Integral domain
- Integral equation
- Integral equation of convolution type
- Integral equation with symmetric kernel
- Integral equations, numerical methods
- Integral exponential function
- Integral extension of a ring
- Integral funnel
- Integral geometry
- Integral hyperbolic cosine
- Integral hyperbolic sine
- Integral ideal
- Integral invariant
- Integral logarithm
- Integral manifold
- Integral object of a category
- Integral of a differential equation
- Integral operator
- Integral over trajectories
- Integral part
- Integral point
- Integral points, distribution of
- Integral representation of an analytic function
- Integral representations in multi-dimensional complex analysis
- Integral representations of linear operators
- Integral ring
- Integral separation condition
- Integral sine
- Integral sum
- Integral surface
- Integral test
- Integral transform
- Integralgeometric measure
- Integrals in involution
- Integrating factor
- Integration
- Integration, numerical
- Integration by parts
- Integration by substitution
- Integration of differential equations in closed form
- Integration on manifolds
- Integro-differential equation
- Inter-quantile width
- Interaction, representation of
- Intercept
- Interior
- Interior-point methods in mathematical programming
- Interior differential operator
- Interior geometry
- Interior mapping
- Interior of a set
- Interior point of a set
- Intermediate Jacobian
- Intermediate efficiency
- Intermediate logic
- Internal boundary
- Internal metric
- Internal variations, method of
- Internal waves
- Interpolation
- Interpolation formula
- Interpolation in numerical mathematics
- Interpolation of operators
- Interpolation process
- Interpolation spline
- Interpretation
- Interpretation (Formalized Language)
- Intersection homology
- Intersection index (in algebraic geometry)
- Intersection index (in homology)
- Intersection of sets
- Intersection theory
- Intertwining number
- Intertwining operator
- Interval
- Interval, closed
- Interval, open
- Interval analysis
- Interval and segment
- Interval dimension of a partially ordered set
- Interval estimator
- Interval order
- Interval topology
- Intuitionism
- Intuitionistic arithmetic
- Intuitionistic logic
- Intuitionistic predicate calculus
- Intuitionistic propositional calculus
- Invariance, principle of
- Invariance of a statistical procedure
- Invariant
- Invariant average
- Invariant differential operator
- Invariant imbedding
- Invariant integration
- Invariant measure
- Invariant metric
- Invariant object
- Invariant set
- Invariant statistic
- Invariant subgroup
- Invariant subset
- Invariant subspace
- Invariant subspace of a representation
- Invariant test
- Invariants, theory of
- Inverse function
- Inverse hyperbolic functions
- Inverse mapping
- Inverse matrix
- Inverse parabolic partial differential equation
- Inverse scattering, full-line case
- Inverse scattering, half-axis case
- Inverse scattering, multi-dimensional case
- Inverse semi-group
- Inverse trigonometric functions
- Inversion
- Inversion (in combinatorics)
- Inversion of a matrix
- Inversion of a series
- Inversion of an elliptic integral
- Inversion semi-group
- Invertible element
- Invertible matrix
- Invertible module
- Invertible sheaf
- Involute
- Involution
- Involution algebra
- Involution representation
- Involution semigroup
- Involutional system
- Involutive distribution
- Irrational number
- Irreducible analytic space
- Irreducible continuum
- Irreducible ideal
- Irreducible mapping
- Irreducible matrix group
- Irreducible module
- Irreducible polynomial
- Irreducible representation
- Irreducible topological space
- Irreducible variety
- Irregular boundary point
- Irregular prime number
- Irregular singular point
- Irregularity
- Irregularity indices
- Irwin, Joseph Oscar
- Ising model
- Iso-optic curve
- Isocline
- Isogeny
- Isogonal
- Isogonal trajectory
- Isogons and isohedra
- Isol
- Isolated point
- Isolated set
- Isolated singular point
- Isolated subgroup
- Isometric immersion
- Isometric mapping
- Isometric operator
- Isometric surfaces
- Isomorphism
- Isomorphism problem
- Isoperimetric inequality
- Isoperimetric inequality, classical
- Isoperimetric problem
- Isoptic
- Isothermal coordinates
- Isothermal net
- Isothermal surface
- Isotomic conjugate
- Isotone mapping
- Isotopy
- Isotopy (in algebra)
- Isotopy (in topology)
- Isotropic quadratic form
- Isotropic submanifold
- Isotropic vector
- Isotropy congruence
- Isotropy group
- Isotropy representation
- Iterate
- Iterated function system
- Iterated kernel
- Iteration algorithm
- Iteration methods
- Ito formula
- Ito process
- Itô formula
- Itô process
- Ivanov-Petrova metric
- Ivanov–Petrova metric
- Iversen theorem
- Iwasawa decomposition
- Iwasawa theory
- JB*-triple
- Jackson inequality
- Jackson singular integral
- Jackson theorem
- Jacobi brackets
- Jacobi condition
- Jacobi elliptic functions
- Jacobi equation
- Jacobi inversion problem
- Jacobi matrix
- Jacobi method
- Jacobi polynomials
- Jacobi principle
- Jacobi symbol
- Jacobi transform
- Jacobi variety
- Jacobi vector field
- Jacobian
- Jacobian conjecture
- Jacobson-Bourbaki theorem
- Jacobson category
- Jacobson radical
- Jacobson ring
- Jacobson–Bourbaki theorem
- Jaeger composition product
- Janet theorem
- Janson inequality
- Jeffreys, Harold
- Jeffreys distance
- Jenkins theorem
- Jensen formula
- Jensen inequality
- Jet
- Jeu de taquin
- Jevons, William Stanley
- Joachimsthal surface
- John-Nirenberg inequalities
- John–Nirenberg inequalities
- Join
- Join-irreducible element
- Joint distribution
- Jones-Conway polynomial
- Jones polynomial
- Jones unknotting conjecture
- Jones–Conway polynomial
- Jordan, Károly
- Jordan-Dedekind lattice
- Jordan-Dedekind property
- Jordan-Dedekind space
- Jordan-Holder theorem
- Jordan-Hölder theorem
- Jordan algebra
- Jordan criterion
- Jordan curve
- Jordan decomposition
- Jordan decomposition (of a function)
- Jordan decomposition (of a measure)
- Jordan decomposition (of a signed measure)
- Jordan decomposition (of an endomorphism)
- Jordan lemma
- Jordan matrix
- Jordan measure