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- Immediate extension → Valuation#Extension of valuations.
- Imputation → Sharing
- Inaccessible cardinal → Cardinal number
- Incentre → Triangle centre
- Incidence structure → Incidence system
- Independent measures → Singular measures
- Indicator function → Characteristic function of a set
- Indifference → Pre-order
- Indiscrete space → Anti-discrete space
- Induced topology → Relative topology
- Infimum → Upper and lower bounds
- Initial object → Final object
- Injective envelope → Projective covering
- Injective hull → Projective covering
- Integrable function → Integral
- Integral closure → Integral extension of a ring
- Integral ring → Integral domain
- Integralgeometric measure → Favard measure
- Interior → Interior of a set
- Interval topology → Order topology
- Intuitionistic arithmetic → Intuitionism
- Intuitionistic predicate calculus → Intuitionistic logic
- Inverse semi-group → Inversion semi-group
- Invertible matrix → Non-singular matrix
- Involute → Evolvent of a plane curve
- Isolated set → Isol
- Isotomic conjugate → Isogonal
- Ito formula → Itô formula
- Ito process → Itô process
- Ivanov–Petrova metric → Ivanov-Petrova metric
- Jacobson–Bourbaki theorem → Jacobson-Bourbaki theorem
- John–Nirenberg inequalities → John-Nirenberg inequalities
- Jones polynomial → Jones-Conway polynomial
- Jones–Conway polynomial → Jones-Conway polynomial
- Jordan-Holder theorem → Jordan-Hölder theorem
- Jordan–Dedekind lattice → Jordan-Dedekind lattice
- Jordan–Dedekind property → Jordan-Dedekind property
- Jordan–Dedekind space → Jordan-Dedekind space
- Jordan–Hölder theorem → Jordan-Hölder theorem
- Joseph Bertrand → Bertrand, Joseph
- Julia-Wolff-Caratheodory theorem → Julia-Wolff-Carathéodory theorem
- Julia–Wolff–Carathéodory theorem → Julia-Wolff-Carathéodory theorem
- K-lineal → Vector lattice
- Kac–Moody algebra → Kac-Moody algebra
- Kaehler-Einstein manifold → Kähler-Einstein manifold
- Kaehler-Einstein metric → Kähler-Einstein metric
- Kaehler form → Kähler form
- Kaehler manifold → Kähler manifold
- Kaehler metric → Kähler metric
- Kalman–Yakubovich lemma → Frequency theorem
- Karush–Kuhn–Tucker conditions → Karush-Kuhn-Tucker conditions
- Kawamata–Viehweg vanishing theorem → Kawamata-Viehweg vanishing theorem
- Keisler–Shelah isomorphism theorem → Keisler-Shelah isomorphism theorem
- Keldysh–Lavrent'ev example → Keldysh-Lavrent'ev example
- Keldysh–Lavrent'ev theorem → Keldysh-Lavrent'ev theorem
- Kelley space → Compactly generated space
- Kellogg–Evans theorem → Kellogg-Evans theorem
- Kernel function → Bergman kernel function
- Kernel of a game → Core in the theory of games
- Kernel of a set → Interior of a set
- Kervaire–Milnor invariant → Kervaire-Milnor invariant
- Kirkman triple system → Steiner triple system
- Kleene–Mostowski classification → Kleene-Mostowski classification
- Klein coordinates → Plücker coordinates
- Klein–Gordon equation → Klein-Gordon equation
- Knaster–Tarski–Davis theorem → Fixed-point property
- Kneser–Tits hypothesis → Kneser-Tits hypothesis
- Kolmogorov–Chapman equation → Kolmogorov-Chapman equation
- Kolmogorov–Seliverstov theorem → Kolmogorov-Seliverstov theorem
- Kolmogorov–Smirnov test → Kolmogorov-Smirnov test
- Konig theorem → König theorem
- Kontorovich–Lebedev transform → Kontorovich-Lebedev transform
- Korteweg–de Vries equation → Korteweg-de Vries equation
- Kothe-Toeplitz dual → Köthe-Toeplitz dual
- Kronecker delta → Kronecker symbol
- Kronecker–Capelli theorem → Kronecker-Capelli theorem
- Kronecker–Weber theorem → Abelian number field
- Kronrod–Patterson quadrature formula → Kronrod-Patterson quadrature formula
- Krull topology → Galois topological group
- Krull–Remak–Schmidt theorem → Krull-Remak-Schmidt theorem
- Kruskal–Katona theorem → Kruskal-Katona theorem
- Krylov–Bogolyubov method of averaging → Krylov-Bogolyubov method of averaging
- Kuenneth formula → Künneth formula
- Kuhn-Tucker conditions → Karush-Kuhn-Tucker conditions
- Kuhn–Tucker conditions → Karush-Kuhn-Tucker conditions
- Kullback–Leibler-type distance measures → Kullback-Leibler-type distance measures
- Kullback–Leibler information → Kullback-Leibler information
- Kummer group → Kummer extension
- Kuramoto–Sivashinsky equation → Kuramoto-Sivashinsky equation
- Kuratowksi closure operator → Closure space
- Kuratowski closure operator → Closure space
- Kuratowski–Knaster fan → Kuratowski-Knaster fan
- Kurepa tree → Aronszajn tree
- Kurzweil–Henstock integral → Kurzweil-Henstock integral
- Kustaanheimo–Stiefel transformation → Kustaanheimo-Stiefel transformation
- Kutta–Merson method → Kutta-Merson method
- Kuzminov theorem → Cardinal characteristic
- Kähler–Einstein manifold → Kähler-Einstein manifold
- Kähler–Einstein metric → Kähler-Einstein metric
- König–Egerváry theorem → König theorem
- Köthe–Toeplitz dual → Köthe-Toeplitz dual
- LYM inequality → Sperner theorem
- Laguerre equation → Laguerre polynomials
- Lame coefficients → Lamé coefficients
- Lame constants → Lamé constants
- Lame curve → Lamé curve
- Lame equation → Lamé equation
- Lame function → Lamé function
- Laplace–Beltrami equation → Laplace-Beltrami equation
- Laplace–Stieltjes transform → Laplace-Stieltjes transform
- Large deviation principle → Large deviations
- Larson order → Hopf order
- Lawson topology → Continuous lattice
- Lax–Milgram lemma → Lax-Milgram lemma
- Lax–Wendroff method → Lax-Wendroff method
- Least upper bound → Upper and lower bounds
- Lebedev–Skal'skaya transform → Lebedev-Skal'skaya transform
- Lebesgue set → Lebesgue point
- Lebesgue–Stieltjes integral → Lebesgue-Stieltjes integral
- Lee–Friedrichs model → Lee-Friedrichs model
- Left separated space → Right separated space
- Legendre equation → Legendre functions
- Lehmer numbers → Lucas sequence
- Leibniz–Hopf algebra → Leibniz-Hopf algebra
- Leibniz–Hopf algebra and quasi-symmetric functions → Leibniz-Hopf algebra and quasi-symmetric functions
- Lemoine point → Triangle centre
- Levitskii radical → Locally nilpotent algebra
- Levi–Mal'tsev decomposition → Levi-Mal'tsev decomposition
- Levy-Cramer theorem → Lévy-Cramér theorem
- Levy-Khinchin canonical representation → Lévy-Khinchin canonical representation
- Levy-Prokhorov metric → Lévy-Prokhorov metric
- Levy canonical representation → Lévy canonical representation
- Levy inequality → Lévy inequality
- Levy metric → Lévy metric
- Lexicographic product → Lexicographic order
- Liar paradox → Antinomy
- Lie-group, p-adic → Lie group, p-adic
- Lie-group-adic → Lie group, p-adic
- Lieb–Thirring inequalities → Lieb-Thirring inequalities
- Lienard-Chipart criterion → Liénard-Chipart criterion
- Lienard equation → Liénard equation
- Lie–Kolchin theorem → Lie-Kolchin theorem
- Limes inferior → Upper and lower limits
- Limes superior → Upper and lower limits
- Limit cardinal → Cardinal number
- Limit ordinal → Ordinal number
- Lindeberg–Feller theorem → Lindeberg-Feller theorem
- Lindelof construction → Lindelöf construction
- Lindelof hypothesis → Lindelöf hypothesis
- Lindelof principle → Lindelöf principle
- Lindelof space → Lindelöf space
- Lindelof summation method → Lindelöf summation method
- Lindelof theorem → Lindelöf theorem
- Lindemann–Weierstrass theorem → Lindemann theorem
- Linear complexity profile → Linear complexity of a sequence
- Linear dependence → Linear independence
- Linear mixed models → Random coefficient models
- Linear order → Totally ordered set
- Linear skein → Skein module
- Linear space → Vector space
- Linear span → Linear hull
- Linearly ordered set → Totally ordered set
- Liouville-Lojasiewicz inequality → Liouville-Łojasiewicz inequality
- Liouville–Ostrogradski formula → Liouville-Ostrogradski formula
- Liouville–Łojasiewicz inequality → Liouville-Łojasiewicz inequality
- Lipschitz Function → Lipschitz function
- Liénard–Chipart criterion → Liénard-Chipart criterion
- Local base → Defining system of neighbourhoods
- Locally small category → Small category
- Log-normal distribution → Logarithmic normal distribution
- Logarithmic capacity → Capacity
- Logarithmic height → Height, in Diophantine geometry
- Logarithmic integral → Integral logarithm
- Logistic models → Logistic regression
- Logit regression → Logistic regression
- Lojasiewicz-Simon inequality → Lojasiewicz inequality
- Lorentz group → Lorentz transformation
- Lovasz local lemma → Lovász local lemma
- Lowenheim-Skolem theorem → Gödel completeness theorem
- Lower central series → Central series of a group
- Lower limit → Upper and lower limits
- Lower radical → Radical of rings and algebras
- Lowner-Heinz inequality → Löwner-Heinz inequality
- Lowner equation → Löwner equation
- Lowner method → Löwner method
- Lucas numbers → Fibonacci numbers
- Lueroth problem → Lüroth problem
- Luzin-Denjoy theorem → Denjoy-Luzin theorem
- Luzin–Denjoy theorem → Denjoy-Luzin theorem
- Luzin–Privalov theorems → Luzin-Privalov theorems
- Lyapunov–Schmidt equation → Lyapunov-Schmidt equation
- Lyusternik–Shnirel'man–Borsuk covering theorem → Lyusternik-Shnirel'man-Borsuk covering theorem
- Lévy–Cramér theorem → Lévy-Cramér theorem
- Lévy–Khinchin canonical representation → Lévy-Khinchin canonical representation
- Lévy–Prokhorov metric → Lévy-Prokhorov metric
- Löwenheim-Skolem theorem → Gödel completeness theorem
- Löwenheim–Skolem theorem → Gödel completeness theorem
- Löwner–Heinz inequality → Löwner-Heinz inequality
- Machlup–Onsager function → Onsager-Machlup function
- Mackey–Borel structure → Mackey-Borel structure
- Mahlo cardinal → Cardinal number
- Main talk:Poisson manifold → Poisson manifold
- Mainardi–Codazzi equations → Peterson-Codazzi equations
- Malgrange–Ehrenpreis theorem → Malgrange-Ehrenpreis theorem
- Mann–Whitney test → Mann-Whitney test
- Markov chain (Statprob) → Markov chains
- Markov process (Statprob) → Markov chains
- Markov processes → Markov chains
- Markov spectrum → Markov spectrum problem
- Markov–Bernstein-type inequalities → Markov-Bernstein-type inequalities
- Martin's axiom → Suslin hypothesis
- Maslov measure → Idempotent analysis#Idempotent integration and Maslov measures.
- Masser–Philippon/Lazard–Mora example → Masser-Philippon/Lazard-Mora example
- Massless Klein–Gordon equation → Massless Klein-Gordon equation
- Matrix Viete theorem → Matrix Viète theorem
- Matrix congruence → Congruent matrices
- Matrix transposition → Transposed matrix
- Matroid lattice → Semi-modular lattice
- Maurer–Cartan form → Maurer-Cartan form
- Max-flow-min-cut theorem → Flow in a network
- Maximin principle → Minimax principle
- Mazur–Orlicz theorem → Mazur-Orlicz theorem
- McKay–Alperin conjecture → McKay-Alperin conjecture
- Meager set → Category of a set
- Measurable cardinal → Cardinal number
- Medial quasi-group → Quasi-group#Basic classes of quasi-groups.
- Meet-irreducible element → Join-irreducible element
- Mehler–Fock transform → Mehler-Fock transform
- Men'shov–Rademacher theorem → Men'shov-Rademacher theorem
- Mersenne prime → Mersenne number
- Mertens conjecture → Möbius series
- Meta-nilpotent group → Poly-nilpotent group
- Method of steepest descent (for integrals) → Saddle point method
- Metric outer measure → Carathéodory measure
- Michaelis–Menten equation → Michaelis-Menten equation
- Minkowski–Farkas theorem → Linear inequality
- Minorant → Majorant and minorant
- Model, mathematical → Mathematical model
- Modulo → Remainder of an integer
- Moebius function → Möbius function
- Moebius inversion → Möbius inversion
- Moebius plane → Möbius plane
- Moebius series → Möbius series
- Moebius strip → Möbius strip
- Monar → Unary algebra
- Monge-Ampere equation → Monge-Ampère equation
- Monge–Ampère equation → Monge-Ampère equation
- Monoid algebra → Semi-group algebra
- Monoidal category → Closed monoidal category
- Montesinos–Nakanishi conjecture → Montesinos-Nakanishi conjecture
- Monty Hall problem → Monty hall problem
- Morse–Hedlund theorem → Complexity function
- Morse–Smale system → Morse-Smale system
- Moser–Trudinger inequality → Moser-Trudinger inequality
- Moufang–Lie algebra → Mal'tsev algebra
- Muentz theorem → Müntz theorem
- Multiindex → Multi-index notation
- Multipartite graph → Graph, bipartite
- Multiplier sequence space → Köthe-Toeplitz dual
- Mutual information → Information, amount of
- Mutually-singular measures → Singular measures
- NP-complete → NP
- NPSPACE → Computational complexity classes
- Nakayama lemma → Jacobson radical
- Narayama number → Binary tree
- Natural density → Asymptotic density
- Natural transformation → Functorial morphism
- Navier–Stokes equations → Navier-Stokes equations
- Necessary sufficient statistic → Minimal sufficient statistic
- Neighbourhood base → Defining system of neighbourhoods
- Neil parabola → Semi-cubic parabola
- Neron-Severi group → Néron-Severi group
- Neron model → Néron model
- Net in finite geometry(2) → Net in finite geometry
- Network weight → Net (of sets in a topological space)
- Neumann problem(2) → Neumann problem
- Neutral element → Identity element
- Nevanlinna–Pick interpolation → Nevanlinna-Pick interpolation
- Nevanlinna–Pick problem → Nevanlinna-Pick problem
- Newton law of viscosity → Viscosity
- Newtonian fluid → Viscosity
- Newton–Cotes quadrature formula → Newton-Cotes quadrature formula
- Newton–Leibniz formula → Newton-Leibniz formula
- Neyman–Pearson lemma → Neyman-Pearson lemma
- Nikodym boundedness theorem → Nikodým boundedness theorem
- Nikodym convergence theorem → Nikodým convergence theorem
- Nil radical → Nil ideal
- Noether lattice → Multiplicative lattice
- Noether–Enriques theorem → Noether-Enriques theorem
- Non-atomic measure → Atom
- Nonatomic measure → Atom
- Nondeterministic Turing Machines → Nondeterministic Turing machine
- Nordstrom–Robinson code → Preparata code
- Norm-Euclidean field → Euclidean field
- Normal form (for singularities) → Normal form
- Normal variety → Normal scheme
- Normalization principle → Normal algorithm
- Nowhere dense set → Nowhere-dense set
- Nucleolus of a game → Core in the theory of games
- Null element → Zero
- Null morphism → Null object of a category
- Nullary operation → Algebraic operation
- Nullity → Kernel of a linear operator
- Nullstellen Satz → Hilbert theorem#Hilbert's Nullstellen Satz
- Néron–Severi group → Néron-Severi group
- Néron–Tate height → Height, in Diophantine geometry
- O'Nan–Scott theorem → O'Nan-Scott theorem
- Oberbeck–Boussinesq equations → Oberbeck-Boussinesq equations
- Object, geometric → Geometric objects, theory of
- Oceanology, mathematical problems in → Oceanography, mathematical problems in
- Octonion → Cayley numbers
- Odd permutation → Signature (permutation)
- Omega^2-distribution → Omega-squared distribution
- One-one reducibility → Many-one reducibility
- One-point compactification → Aleksandrov compactification
- One-sheet hyperboloid → Hyperboloid
- Onsager–Machlup function → Onsager-Machlup function
- Operator norm → Norm
- Opposite algebra → Opposite ring
- Opposite category → Dual category
- Order-preserving mapping → Isotone mapping
- Ordinal power → Lexicographic order
- Ordinary differential equation → Differential equation, ordinary
- Orlicz–Lorentz space → Orlicz-Lorentz space
- Orlicz–Sobolev space → Orlicz-Sobolev space
- Ornstein–Chacon ergodic theorem → Ornstein-Chacon ergodic theorem
- Ornstein–Uhlenbeck process → Ornstein-Uhlenbeck process
- Orr–Sommerfeld equation → Orr-Sommerfeld equation
- Orthocentric triangle → Orthocentre
- Orthocomplement → Orthomodular lattice
- Orthogonal measures → Singular measures
- Orthogonal trajectory → Isogonal trajectory
- Orthonormal basis → Orthogonal basis
- Orthoptic → Isoptic
- Osgood condition → Osgood criterion
- Osterwalder–Schrader axioms → Quantum field theory, axioms for
- Ostrogradski-Liouville formula → Liouville-Ostrogradski formula
- Ostrogradski formula → Divergence theorem
- Ostrogradski–Liouville formula → Liouville-Ostrogradski formula
- Outer automorphism → Inner automorphism
- Overlapping shuffle → Leibniz-Hopf algebra
- PSPACE → Computational complexity classes
- Pade approximation → Padé approximation
- Painleve-type equations → Painlevé-type equations
- Painleve equation → Painlevé equation
- Painleve problem → Painlevé problem
- Painleve test → Painlevé test
- Painleve theorem → Painlevé theorem
- Paley–Wiener theorem → Paley-Wiener theorem
- Parallel translation → Parallel transport
- Parastrophy → Quasi-group#Basic concepts.
- Parikh vector → Multiset
- Parity check → Linear code
- Parseval-Plancherel formula → Plancherel theorem
- Parseval–Plancherel formula → Plancherel theorem
- Partial differential equation → Differential equation, partial
- Partition function (statistical physics) → Statistical sum
- Pascal limacon → Pascal limaçon
- Path integral → Integral over trajectories
- Pearl–Verhulst logistic process → Pearl-Verhulst logistic process
- Pearson differential equation → Pearson curves
- Pearson distribution → Pearson curves
- Peck poset → Sperner property
- Peclet number → Péclet number
- Pell's equation → Pell equation
- Perfect matching → Factorization
- Periodic group → Torsion group
- Permissible law (inference) → Sound rule
- Permutation matrix → Monomial matrix
- Perron–Frobenius theorem → Perron-Frobenius theorem
- Perron–Stieltjes integral → Perron-Stieltjes integral
- Peterson–Codazzi equations → Peterson-Codazzi equations
- Petersson conjecture → Ramanujan hypothesis
- Peter–Weyl theorem → Peter-Weyl theorem
- Phase integral, method of the → WKB method
- Phragmen-Lindelof theorem → Phragmén-Lindelöf theorem
- Phragmén–Lindelöf theorem → Phragmén-Lindelöf theorem
- Picard-Lindelof theorem → Cauchy-Lipschitz theorem
- Picard existence theorem → Cauchy-Lipschitz theorem
- Pierre de Fermat → Fermat, Pierre de
- Pixley–Roy hyperspace → Hyperspace
- Playfair axiom → Fifth postulate
- Plenary power → Bernstein algebra
- Pluecker coordinates → Plücker coordinates
- Pluecker formulas → Plücker formulas
- Pluecker interpretation → Plücker interpretation
- Pluming → Feathering
- Plurisuperharmonic function → Plurisubharmonic function
- Pochhammer symbol → Factorial
- Pohlke–Schwarz theorem → Pohlke-Schwarz theorem
- Poincare-Bendixson theory → Poincaré-Bendixson theory
- Poincare-Bertrand formula → Poincaré-Bertrand formula
- Poincare-Dulac theorem → Poincaré-Dulac theorem
- Poincare-Hopf theorem → Poincaré-Hopf theorem
- Poincare complex → Poincaré complex
- Poincare conjecture → Poincaré conjecture
- Poincare divisor → Poincaré divisor
- Poincare duality → Poincaré duality
- Poincare equations → Poincaré equations
- Poincare group → Poincaré group
- Poincare last theorem → Poincaré last theorem
- Poincare mapping → Poincaré mapping
- Poincare model → Poincaré model
- Poincare problem → Poincaré problem
- Poincare return map → Poincaré return map
- Poincare return theorem → Poincaré return theorem
- Poincare space → Poincaré space
- Poincare sphere → Poincaré sphere
- Poincare theorem → Poincaré theorem
- Poincare theorem in stability theory → Poisson stability
- Poincaré theorem in stability theory → Poisson stability
- Poincaré–Bendixson theory → Poincaré-Bendixson theory
- Poincaré–Bertrand formula → Poincaré-Bertrand formula
- Poincaré–Dulac theorem → Poincaré-Dulac theorem
- Poincaré–Hopf theorem → Poincaré-Hopf theorem
- Pointwise addition → Pointwise operation
- Pointwise limit → Pointwise convergence
- Pointwise multiplication → Pointwise operation
- Poisson-gamma mixture model → Modeling count data
- Polarisation identity → Polarization identity
- Polya distribution → Pólya distribution
- Polya theorem → Pólya theorem
- Polynomial ring → Ring of polynomials
- Poset → Partially ordered set
- Posterior distribution → A posteriori distribution
- Pre-base → Subbase
- Pre-lambda-ring → Lambda-ring
- Pre-norm → Semi-norm
- Preference relation → Pre-order
- Primary representation → Factor representation
- Prime number theorem → Distribution of prime numbers
- Primitive class → Algebraic systems, variety of
- Primitive element of a Galois field → Galois field structure
- Principal ideal domain → Principal ideal ring
- Principal isotopy → Isotopy (in algebra)
- Prior distribution → A priori distribution
- Privacy → Statistical approaches to protecting confidentiality in public use data
- Privaloff theorem → Privalov theorem
- Problème des ménages → Classical combinatorial problems
- Problème des rencontres → Montmort matching problem
- Product rule → Leibniz rule
- Product topology → Topological product
- Projective height → Height, in Diophantine geometry
- Projective variety → Projective algebraic set
- Proximity → Proximity space
- Pruefer domain → Prüfer domain
- Pruefer surface → Prüfer surface
- Prüfer group → Quasi-cyclic group
- Pseudo-isometry → Quasi-isometry
- Pseudo-vector → Axial vector
- Psi-ring → Lambda-ring
- Puiseux series → Branch point
- Pullback → Fibre product of objects in a category#Pullback, Pushout
- Purely unrectifiable set → Rectifiable set#Purely unrectifiable
- Pushout → Fibre product of objects in a category#Pullback, Pushout
- Putnam–Fuglede theorems → Putnam-Fuglede theorems
- Pythagoras' theorem → Pythagorean theorem
- Pythagoras number → Pythagorean field
- Pythagoras theorem → Pythagorean theorem
- Pythagorean closure → Pythagorean field
- Pythagorean triple → Pythagorean numbers
- QAC → Quasi-algebraically closed field
- Quadratic closure → Quadratically closed field
- Quadratic error → Quadratic deviation
- Quadratic module → Quadratic form
- Quadratic non-residue → Quadratic residue
- Quadratic space → Quadratic form
- Quadratrix of Hippias → Dinostratus quadratrix
- Quasi-Boolean space → Coherent space
- Quasi-scalar matrix → Diagonal matrix
- Quizmaster problem → Monty hall problem
- R-group → Group with unique division
- Radius of convergence → Power series
- Radon-Nikodym decomposition → Absolutely continuous measures
- Radon-Nikodym property → Radon-Nikodým theorem
- Radon-Nikodym theorem → Radon-Nikodým theorem
- Radon space → Radon measure#Radon space
- Radon–Nikodým theorem → Radon-Nikodým theorem
- Ranked poset → Sperner property
- Rao-Cramer inequality → Rao-Cramér inequality
- Rao–Blackwell–Kolmogorov theorem → Rao-Blackwell-Kolmogorov theorem
- Rao–Cramér inequality → Rao-Cramér inequality
- Rare events analysis → Large deviations
- Ray class group → Modulus in algebraic number theory
- Rayleigh–Faber–Krahn inequality → Rayleigh-Faber-Krahn inequality
- Rayleigh–Taylor instability → Rayleigh-Taylor instability
- Ray–Knight compactification → Ray-Knight compactification
- Real-closed field → Real closed field
- Real valued measure → Signed measure
- Reduced residue system → Reduced system of residues
- Reduced trace → Reduced norm
- Regular Borel measure → Borel measure
- Regular cardinal → Cardinal number
- Regular closed set → Canonical set
- Regular expression → Regular event
- Regular ideal → Modular ideal
- Regular language → Regular event
- Regular measure → Borel measure
- Regular open set → Canonical set
- Regular outer measure → Borel measure