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- 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
- Jordan normal form
- Jordan theorem
- Jordan totient function
- Jordan triple system
- Jordan–Dedekind lattice
- Jordan–Dedekind property
- Jordan–Dedekind space
- Jordan–Hölder theorem
- Joseph Bertrand
- Jourdain principle
- Julia-Wolff-Caratheodory theorem
- Julia-Wolff-Carathéodory theorem
- Julia set
- Julia theorem
- Julia–Wolff–Carathéodory theorem
- Jump function
- Jump process
- Jung theorem
- K-contact-flow
- K-convergence
- K-functor
- K-lineal
- K-space
- K-system(2)
- K-theory
- K3-surface
- KP-equation
- Kac-Moody algebra
- Kac–Moody algebra
- Kaehler-Einstein manifold
- Kaehler-Einstein metric
- Kaehler form
- Kaehler manifold
- Kaehler metric
- Kakutani theorem
- Kalman–Yakubovich lemma
- Kantorovich process
- Kaplansky field
- Kappa
- Karamata theory
- Karnaugh map
- Karush-Kuhn-Tucker conditions
- Karush–Kuhn–Tucker conditions
- Kauffman bracket polynomial
- Kauffman polynomial
- Kawaguchi space
- Kawamata-Viehweg vanishing theorem
- Kawamata rationality theorem
- Kawamata–Viehweg vanishing theorem
- Kazdan inequality
- Keisler-Shelah isomorphism theorem
- Keisler–Shelah isomorphism theorem
- Keldysh-Lavrent'ev example
- Keldysh-Lavrent'ev theorem
- Keldysh theorem
- Keldysh–Lavrent'ev example
- Keldysh–Lavrent'ev theorem
- Kelley space
- Kellogg-Evans theorem
- Kellogg theorem
- Kellogg–Evans theorem
- Kelvin functions
- Kelvin transformation
- Kempf vanishing theorem
- Kendall coefficient of rank correlation
- Kendall tau metric
- Kepler equation
- Kerdock and Preparata codes
- Kergin interpolation
- Kernel congruence
- Kernel function
- Kernel of a complex sequence
- Kernel of a function
- Kernel of a game
- Kernel of a linear operator
- Kernel of a loop
- Kernel of a matrix
- Kernel of a morphism in a category
- Kernel of a semi-group
- Kernel of a set
- Kernel of a summation method
- Kernel of an integral operator
- Kernel pair
- Kerr metric
- Kervaire-Milnor invariant
- Kervaire invariant
- Kervaire–Milnor invariant
- Keynes, John Maynard
- Kharitonov polynomial theory
- Khinchin inequality
- Khinchin integral
- Khinchin theorem
- Kiaer, Anders Nicolai
- Killing form
- Killing space
- Killing vector
- Kinetic equation
- Kirby calculus
- Kirchhoff formula
- Kirchhoff method
- Kirillov conjecture
- Kirkman schoolgirls problem
- Kirkman triple system
- Kirszbraun theorem
- Kleene-Mostowski classification
- Kleene–Mostowski classification
- Klein-Gordon equation
- Klein coordinates
- Klein interpretation
- Klein space
- Klein surface
- Kleinian group
- Klein–Gordon equation
- Knapsack problem
- Knaster continuum
- Knaster–Tarski–Davis theorem
- Kneser-Tits hypothesis
- Kneser theorem
- Kneser–Tits hypothesis
- Knibbs, George Handley
- Knopp summation method
- Knot and link diagrams
- Knot and link groups
- Knot table
- Knot theory
- Knots and links, quadratic forms of
- Knotted sphere
- Knudsen number
- Kobayashi hyperbolicity
- Kodaira dimension
- Kodaira theorem
- Koebe function
- Koebe theorem
- Kolmogorov-Chapman equation
- Kolmogorov-Seliverstov theorem
- Kolmogorov-Smirnov test
- Kolmogorov axiom
- Kolmogorov duality
- Kolmogorov equation
- Kolmogorov inequality
- Kolmogorov integral
- Kolmogorov space
- Kolmogorov test
- Kolmogorov test/Fig1
- Kolmogorov–Chapman equation
- Kolmogorov–Seliverstov theorem
- Kolmogorov–Smirnov test
- Konig theorem
- Kontorovich-Lebedev-transform(2)
- Kontorovich-Lebedev transform
- Kontorovich–Lebedev transform
- Kontsevich integral
- Korn inequality
- Korovkin-type approximation theory
- Korovkin theorems
- Korteweg-de Vries equation
- Korteweg–de Vries equation
- Koszul complex
- Kotel'nikov interpretation
- Kothe-Toeplitz dual
- Kowalewski top
- Kravchuk, Mikhailo Pylypovych
- Krawtchouk polynomials
- Krein condition
- Krein space
- Kripke models
- Kronecker-Capelli theorem
- Kronecker delta
- Kronecker formula
- Kronecker method
- Kronecker product
- Kronecker symbol
- Kronecker theorem
- Kronecker–Capelli theorem
- Kronecker–Weber theorem
- Kronrod-Patterson quadrature formula
- Kronrod–Patterson quadrature formula
- Krull-Remak-Schmidt theorem
- Krull ring
- Krull topology
- Krull–Remak–Schmidt theorem
- Kruskal-Katona theorem
- Kruskal–Katona theorem
- Krylov-Bogolyubov method of averaging
- Krylov–Bogolyubov method of averaging
- Kuenneth formula
- Kuhn-Tucker conditions
- Kuhn–Tucker conditions
- Kullback-Leibler-type distance measures
- Kullback-Leibler information
- Kullback–Leibler-type distance measures
- Kullback–Leibler information
- Kummer criterion
- Kummer extension
- Kummer group
- Kummer hypothesis
- Kummer surface
- Kummer theorem
- Kummer transformation
- Kuramoto-Sivashinsky equation
- Kuramoto–Sivashinsky equation
- Kuratowksi closure operator
- Kuratowski-Knaster fan
- Kuratowski closure operator
- Kuratowski graph
- Kuratowski polyhedron
- Kuratowski set
- Kuratowski–Knaster fan
- Kurepa tree
- Kurzweil-Henstock integral
- Kurzweil–Henstock integral
- Kustaanheimo-Stiefel transformation
- Kustaanheimo–Stiefel transformation
- Kutta-Merson method
- Kutta–Merson method
- Kuzminov theorem