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Mathematics (R)
- R (complexity)
- R. A. Fisher Lectureship
- Rabatment of the rectangle
- Rabdology
- Rabin signature algorithm
- Rabinovich–Fabrikant equations
- Rabinowitsch trick
- Racah polynomials
- Racah W-coefficient
- Racetrack (game)
- Racetrack principle
- Racks and quandles
- Radar chart
- Rademacher complexity
- Rademacher distribution
- Rademacher system
- Rademacher–Menchov theorem
- Rademacher's theorem
- Rader's FFT algorithm
- Radial basis function network
- Radial basis function
- Radial distance (geometry)
- Radial function
- Radial line
- Radial set
- Radially unbounded function
- Radian
- Radiative flux
- Radical axis
- Radical of a Lie algebra
- Radical of a module
- Radical of a ring
- Radical of an algebraic group
- Radical of an ideal
- Radical of an integer
- Radical polynomial
- Radicial morphism
- Radio navigation
- Radiodrome
- Radius (graph theory)
- Radius of convergence
- Radius of curvature (applications)
- Radius of curvature (mathematics)
- Radius of curvature
- Radius of gyration
- Radius
- Radix economy
- Radix point
- Radix
- Rado graph
- Radó–Kneser–Choquet theorem
- Radon measure
- Radon space
- Radon transform
- Radonifying function
- Radon–Nikodym theorem
- Radon–Riesz property
- Radon's theorem
- Radó's theorem (harmonic functions)
- Rado's theorem (Ramsey theory)
- Radó's theorem (Riemann surfaces)
- Rado's theorem
- Ragsdale conjecture
- Raikov's theorem
- Rainville polynomials
- Raised cosine distribution
- Raising and lowering indices
- Raising Genius
- Rajchman measure
- Rake (angle)
- R-algebroid
- Ramanujam vanishing theorem
- Ramanujam–Samuel theorem
- Ramanujan graph
- Ramanujan Mathematical Society
- Ramanujan prime
- Ramanujan summation
- Ramanujan tau function
- Ramanujan theta function
- Ramanujan–Nagell equation
- Ramanujan–Petersson conjecture
- Ramanujan's congruences
- Ramanujan's lost notebook
- Ramanujan's master theorem
- Ramanujan's sum
- Ramanujan's ternary quadratic form
- Ramanujan–Soldner constant
- Ramer–Douglas–Peucker algorithm
- Ramification group
- Ramification theory of valuations
- Ramification
- Ramified forcing
- Ramism
- Ramp function
- Ramsey cardinal
- Ramsey RESET test
- Ramsey theory
- Ramsey's theorem
- Rand index
- Randić's molecular connectivity index
- Randolph diagram
- Random coil
- Random compact set
- Random dynamical system
- Random effects estimation
- Random effects model
- Random element
- Random Fibonacci sequence
- Random field
- Random forest
- Random function
- Random geometric graph
- Random graph
- Random group
- Random matrix
- Random measure
- Random minimal spanning tree
- Random multinomial logit
- Random naive Bayes
- Random neural network
- Random number book
- Random number table
- Random number
- Random optimization
- Random permutation statistics
- Random permutation
- Random regular graph
- Random search
- Random self-reducibility
- Random sequence
- Random structure function
- Random tree
- Random variable
- Random variate
- Random walk closeness centrality
- Random walk hypothesis
- Random walk
- Random-access Turing machine
- Randomization
- Randomized algorithm
- Randomized algorithms as zero-sum games
- Randomized response
- Randomness extractor
- Randomness tests
- Randomness
- Range (mathematics)
- Range (statistics)
- Range searching
- Rank (differential topology)
- Rank (graph theory)
- Rank (linear algebra)
- Rank 3 permutation group
- Rank correlation
- Rank error-correcting code
- Rank factorization
- Rank of a group
- Rank of a partition
- Rank of an abelian group
- Rank product
- Rank ring
- Ranked poset
- Rankine vortex
- Rankine–Hugoniot conditions
- Rankine-Hugoniot equation
- Rankine's method
- Ranking
- Rankin–Selberg method
- Rank-into-rank
- Rankit
- Ranklet
- Rank–nullity theorem
- Rank-size distribution
- RANSAC
- Rao–Blackwell theorem
- Raptor code
- Rarita–Schwinger equation
- Rasch model estimation
- Rasch model
- Rasiowa–Sikorski lemma
- Rastrigin function
- Rata Die
- Rate distortion theory
- Rate function
- Rate of convergence
- Ratio distribution
- Ratio estimator
- Ratio test
- Ratio
- Rational approximation
- Rational consequence relation
- Rational dependence
- Rational difference equation
- Rational function
- Rational homotopy theory
- Rational mapping
- Rational normal curve
- Rational normal scroll
- Rational number
- Rational point
- Rational quadratic covariance function
- Rational reciprocity law
- Rational reconstruction (mathematics)
- Rational representation
- Rational root theorem
- Rational sequence topology
- Rational sieve
- Rational singularity
- Rational surface
- Rational trigonometry
- Rational variety
- Rational zeta series
- Rationalisation (mathematics)
- Ratner's theorems
- Rauch comparison theorem
- Rauzy fractal
- Raven paradox
- Ravenel conjectures
- Raw score
- Ray casting
- Ray transfer matrix analysis
- Rayleigh distribution
- Rayleigh mixture distribution
- Rayleigh quotient iteration
- Rayleigh quotient
- Rayleigh–Faber–Krahn inequality
- Rayleigh–Plesset equation
- Rayleigh–Ritz method
- Rayleigh's method of dimensional analysis
- Raynaud surface
- Raynaud's isogeny theorem
- RE (complexity)
- Reach (mathematics)
- Reachability
- Reaction–diffusion system
- Reaction–diffusion–advection equation
- Reactive search optimization
- Real algebraic geometry
- Real Analysis Exchange
- Real analysis
- Real analytic Eisenstein series
- Real closed field
- Real closed ring
- Real computation
- Real coordinate space
- Real curve
- Real form (Lie theory)
- Real hyperelliptic curve
- Real line
- Real number
- Real plane curve
- Real projective line
- Real projective plane
- Real projective space
- Real representation
- Real structure
- Real tree
- Realcompact space
- Reality structure
- Realizability
- Realization (probability)
- Realization (systems)
- Real-Time Outbreak and Disease Surveillance
- Real-valued function
- Rearrangement inequality
- Reasoning system
- Reassignment method
- Recall bias
- Receiver operating characteristic
- Recession cone
- Reciprocal difference
- Reciprocal distribution
- Reciprocal Fibonacci constant
- Reciprocal Gamma function
- Reciprocal lattice
- Reciprocal polynomial
- Reciprocal rule
- Reciprocating oscillation
- Reciprocation
- Reciprocity (engineering)
- Reciprocity (projective geometry)
- Reciprocity law
- Reciprocity
- Reckoning board
- RE-complete
- Reconstruction conjecture
- Record linkage
- Recreational mathematics
- Rectangle method
- Rectangle
- Rectangular function
- Rectifiable set
- Rectification (geometry)
- Rectified 10-cube
- Rectified 10-orthoplex
- Rectified 10-simplex
- Rectified 120-cell
- Rectified 2 31 polytope
- Rectified 24-cell honeycomb
- Rectified 24-cell
- Rectified 5-cell
- Rectified 5-cube
- Rectified 5-orthoplex
- Rectified 5-simplex
- Rectified 600-cell
- Rectified 6-cube
- Rectified 6-orthoplex
- Rectified 6-simplex
- Rectified 7-cube
- Rectified 7-orthoplex
- Rectified 7-simplex
- Rectified 8-cube
- Rectified 8-orthoplex
- Rectified 8-simplex
- Rectified 9-cube
- Rectified 9-orthoplex
- Rectified 9-simplex
- Rectified cubic honeycomb
- Rectified Gaussian distribution
- Rectified tesseract
- Rectilinear minimum spanning tree
- Rectilinear polygon
- Rectilinear Steiner tree
- Recurrence period density entropy
- Recurrence plot
- Recurrence quantification analysis
- Recurrence relation
- Recurrent point
- Recurrent sequence
- Recurrent tensor
- Recurrent word
- Recursion (computer science)
- Recursion
- Recursionism
- Recursive Bayesian estimation
- Recursive definition
- Recursive economics
- Recursive function
- Recursive indexing
- Recursive language
- Recursive languages and sets
- Recursive ordinal
- Recursive partitioning
- Recursive set
- Recursive tree
- Recursively enumerable language
- Recursively enumerable set
- Recursively inseparable sets
- Red auxiliary number
- Red-black tree
- Redescending M-estimator
- Redheffer matrix
- Redmond–Sun conjecture
- Reduced cost
- Reduced derivative
- Reduced dimensions form
- Reduced homology
- Reduced product
- Reduced residue system
- Reduced ring
- Reducible variety
- Reduct
- Reductio ad absurdum
- Reduction (complexity)
- Reduction (mathematics)
- Reduction (recursion theory)
- Reduction of order
- Reduction of the structure group
- Reduction strategy
- Reduction
- Reductive dual pair
- Reductive group
- Reductive Lie algebra
- Redundancy (information theory)
- Redundant binary representation
- Ree group
- Reeb foliation
- Reeb graph
- Reeb sphere theorem
- Reeb stability theorem
- Reeb vector field
- Reed–Muller code
- Reed-Muller expansion
- Reed–Solomon error correction
- Reeh–Schlieder theorem
- Rees algebra
- Rees factor semigroup
- Reeve tetrahedron
- Refactorable number
- Reference class forecasting
- Reference class problem
- Refinable function
- Refinement (topology)
- Refinement calculus
- Refinement monoid
- Reflected Brownian motion
- Reflecting cardinal
- Reflection (mathematics)
- Reflection formula
- Reflection group
- Reflection principle (disambiguation)
- Reflection principle
- Reflection symmetry
- Reflection theorem
- Reflective subcategory
- Reflexive closure
- Reflexive module
- Reflexive operator algebra
- Reflexive relation
- Reflexive space
- Reflexive transitive closure
- Reflexive transitive symmetric closure
- Reform mathematics
- Regenerative process
- Regev's theorem
- Regge calculus
- Regiomontanus' angle maximization problem
- Region (mathematical analysis)
- Region connection calculus
- Regionalized variable theory
- Register machine
- Regression Analysis of Time Series
- Regression analysis
- Regression dilution
- Regression discontinuity design
- Regression fallacy
- Regression model validation
- Regression toward the mean
- Regression-kriging
- Regressive discrete Fourier series
- Regular cardinal
- Regular category
- Regular chain
- Regular conditional probability
- Regular constraint
- Regular Division of the Plane
- Regular element of a Lie algebra
- Regular element
- Regular extension
- Regular grammar
- Regular graph
- Regular grid
- Regular Hadamard matrix
- Regular homotopy
- Regular ideal
- Regular isotopy
- Regular local ring
- Regular map (graph theory)
- Regular map
- Regular matrix
- Regular matroid
- Regular measure
- Regular number
- Regular paperfolding sequence
- Regular part
- Regular p-group
- Regular polychoron
- Regular polygon
- Regular polyhedron
- Regular polytope
- Regular Polytopes (book)
- Regular prime
- Regular representation
- Regular ring
- Regular semi-algebraic system
- Regular semigroup
- Regular sequence
- Regular singular point
- Regular skew polyhedron
- Regular space
- Regular surface
- Regular tuning
- RegularChains
- Regularity theorem for Lebesgue measure
- Regularity theorem
- Regularization (mathematics)
- Regularization (physics)
- Regularization perspectives on support vector machines
- Regularized canonical correlation analysis
- Regularized Gamma function
- Regularized meshless method
- Regulated function
- Regulated integral
- Reidemeister move
- Reider's theorem
- Reification (statistics)
- Reinforcement learning
- Reinhardt cardinal
- Reinhardt domain
- Reisner Papyrus
- Reiss relation
- Rejecta Mathematica
- Rejection sampling
- Related rates
- Relation algebra
- Relation composition
- Relation construction
- Relational algebra
- Relational calculus
- Relational model
- Relationships among probability distributions
- Relativator
- Relative canonical model
- Relative change and difference
- Relative contact homology
- Relative dimension
- Relative homology
- Relative interior
- Relative neighborhood graph
- Relative risk
- Relative scalar
- Relative standard deviation
- Relative term
- Relatively compact subspace
- Relatively hyperbolic group
- Relativistic Breit–Wigner distribution
- Relativistic chaos
- Relativistic Euler equations
- Relativistic heat conduction
- Relativistic quantum mechanics
- Relativistic system (mathematics)
- Relaxation (approximation)
- Relaxation (iterative method)
- Relevance logic
- Relevance vector machine
- Reliability (psychometrics)
- Reliability theory
- Relief
- Rellich–Kondrachov theorem
- Remainder
- Remak decomposition
- Remarkable cardinal
- Remarks on the Foundations of Mathematics
- Remez algorithm
- Remez inequality
- Remmert–Stein theorem
- Removable singularity
- Rencontres numbers
- Rendezvous problem
- Rendiconti del Seminario Matematico della Università di Padova
- Rendiconti del Seminario Matematico Università e Politecnico di Torino
- Renewal theory
- Renormalization group
- Renormalization
- Rényi entropy
- Repdigit
- Repeated measures design
- Repeating decimal
- Replication (statistics)
- Replicator equation
- Reports on Mathematical Physics
- Representable functor
- Representable number
- Representation (mathematics)
- Representation of a Lie group
- Representation of a Lie superalgebra
- Representation rigid group
- Representation ring
- Representation theorem
- Representation theory of diffeomorphism groups
- Representation theory of finite groups
- Representation theory of Hopf algebras
- Representation theory of SL2(R)
- Representation theory of SU(2)
- Representation theory of the Galilean group
- Representation theory of the Lorentz group
- Representation theory of the Poincaré group
- Representation theory of the symmetric group
- Representation theory
- Representation up to homotopy
- Representative function
- Representer theorem
- Reproducibility
- Reproducing kernel Hilbert space
- Reptation Monte Carlo
- Rep-tile
- Repunit prime
- Repunit
- Resampling (statistics)
- Rescaled range
- Research Institute for Advanced Studies
- Research Institute for Mathematical Sciences
- Research subject
- Resection (orientation)
- Reservoir sampling
- Residual (numerical analysis)
- Residual property (mathematics)
- Residual property
- Residual sum of squares
- Residual time
- Residual topology
- Residual variance
- Residual
- Residually finite group
- Residuated Boolean algebra
- Residuated lattice
- Residuated mapping
- Residue (complex analysis)
- Residue at infinity
- Residue class-wise affine group
- Residue field
- Residue number system
- Residue theorem
- Resistance distance
- Resistive ballooning mode
- Resolution (algebra)
- Resolution (logic)
- Resolution of singularities
- Resolution proof compression by splitting
- Resolution proof reduction via local context rewriting
- Resolvable space
- Resolvent (Galois theory)
- Resolvent cubic
- Resolvent formalism
- Resolvent set
- Resonance
- Resource bounded measure
- Resource contention
- Resource leak
- Response bias
- Response rate
- Response surface methodology
- Restricted Boltzmann machine
- Restricted isometry property
- Restricted Lie algebra
- Restricted maximum likelihood
- Restricted partial quotients
- Restricted product
- Restricted randomization
- Restricted representation
- Restricted root system
- Restricted sumset
- Restriction (mathematics)
- Restriction of scalars
- Resultant
- Resummation
- Rethinking Mathematics
- Retired number
- Retkes convergence criterion
- Retkes identities
- Retract (group theory)
- Return period
- Reuleaux tetrahedron
- Reuleaux triangle
- Reverse Cuthill-McKee algorithm
- Reverse mathematics
- Reverse Monte Carlo
- Reverse perspective
- Reverse Polish notation
- Reverse reconstruction
- Reversed compound agent theorem
- Reverse-delete algorithm
- Reversible diffusion
- Reversible dynamics
- Reversible reference system propagation algorithm
- Reversible-jump Markov chain Monte Carlo
- Reviews in Mathematical Physics
- Revista Colombiana de Estadistica
- Revolutions in Mathematics
- REVSTAT
- Rewriting
- Rexer's Annual Data Miner Survey
- Reye configuration
- Reynolds operator
- Reynolds stress
- Reynolds transport theorem
- Reynolds-averaged Navier–Stokes equations
- Rhind Mathematical Papyrus 2/n table
- Rhind Mathematical Papyrus
- Rho calculus
- Rhode Island Math League
- Rhombic dodecahedral honeycomb
- Rhombic dodecahedron
- Rhombic enneacontahedron
- Rhombic icosahedron
- Rhombic triacontahedron
- Rhombicosacron
- Rhombicosahedron
- Rhombicosidodecahedral prism
- Rhombicosidodecahedron
- Rhombicuboctahedral prism
- Rhombicuboctahedron
- Rhombidodecadodecahedron
- Rhombille tiling
- Rhombitetraheptagonal tiling
- Rhombitetrapentagonal tiling
- Rhombitriheptagonal tiling
- Rhombitrihexagonal prismatic honeycomb
- Rhombitrihexagonal tiling
- Rhombitrioctagonal tiling
- Rhombohedron
- Rhomboid
- Rhombus
- Rhumb line
- Ribbon category
- Ribbon Hopf algebra
- Ribbon knot
- Ribbon theory
- Ribet's theorem
- Riccati equation
- Ricci calculus
- Ricci curvature
- Ricci decomposition
- Ricci flow
- Ricci-flat manifold
- Rice distribution
- Rice's formula
- Rice's theorem
- Rice–Shapiro theorem
- Richard Rusczyk
- Richards equation
- Richard's paradox
- Richardson Chair of Applied Mathematics
- Richardson extrapolation
- Richardson-Lucy deconvolution
- Richardson's theorem
- Richmond surface
- Rickart space
- Ridders' method
- Ridge (differential geometry)
- Ridge detection
- Ridit scoring
- Riemann curvature tensor
- Riemann form
- Riemann hypothesis
- Riemann integral
- Riemann invariant
- Riemann manifold
- Riemann mapping theorem
- Riemann problem
- Riemann series theorem
- Riemann solver
- Riemann sphere
- Riemann sum
- Riemann surface
- Riemann Xi function
- Riemann zeta function
- Riemann–Hilbert correspondence
- Riemann–Hilbert problem
- Riemann–Hurwitz formula
- Riemannian circle
- Riemannian connection on a surface
- Riemannian geometry
- Riemannian manifold
- Riemannian Penrose inequality
- Riemannian submanifold
- Riemannian submersion
- Riemann–Lebesgue lemma
- Riemann–Liouville integral
- Riemann–Roch theorem for smooth manifolds
- Riemann–Roch theorem for surfaces
- Riemann–Roch theorem
- Riemann's differential equation
- Riemann's minimal surface
- Riemann–Siegel formula
- Riemann–Siegel theta function
- Riemann–Silberstein vector
- Riemann–Stieltjes integral
- Riemann–von Mangoldt formula
- Riesel number
- Riesel Sieve
- Riesz function
- Riesz mean
- Riesz potential
- Riesz rearrangement inequality
- Riesz representation theorem
- Riesz sequence
- Riesz space
- Riesz theorem
- Riesz transform
- Riesz–Fischer theorem
- Riesz–Markov–Kakutani representation theorem
- Riesz's lemma
- Riesz–Thorin theorem
- Rigged Hilbert space
- Right angle
- Right conoid
- Right half-plane
- Right inverse
- Right kite
- Right prime
- Right quotient
- Right triangle
- Right-hand rule
- Right-truncatable prime
- Rigid analytic space
- Rigid body dynamics
- Rigid body
- Rigid category
- Rigid cohomology
- Rigid graph
- Rigid origami
- Rigid transformation
- Rigidity (mathematics)
- Rigidity matroid
- Rigorous coupled-wave analysis
- Rijndael mix columns
- Rijndael S-box
- Ring (mathematics)
- Ring class field
- Ring extension
- Ring homomorphism
- Ring of integers
- Ring of mixed characteristic
- Ring of p-adic periods
- Ring of periods
- Ring of polynomial functions
- Ring of sets
- Ring of symmetric functions
- Ring spectrum (homotopy theory)
- Ring theory
- Ringed space
- Ringel–Hall algebra
- Riordan array
- Rippling
- Rips machine
- Risch algorithm
- Rising sun lemma
- Risk Analysis (journal)
- Risk assessment
- Risk box
- Risk function
- Risk limiting post-election audit
- Risk of ruin
- Risk perception
- Risk theory
- Risk-based authentication
- Risk-neutral measure
- Rithmomachy
- Ritz method
- Rivista italiana di economia demografia e statistica (RIEDS)
- Rizza manifold
- RL (complexity)
- R-matrix
- Rng (algebra)
- Road coloring problem
- ROAM
- Robbins algebra
- Robbins constant
- Robbins lemma
- Robbins pentagon
- Robbins problem
- Robbins' problem
- Robbins' theorem
- Robertson graph
- Robertson–Seymour theorem
- Robin boundary condition
- Robinson algorithm
- Robinson arithmetic
- Robinson's joint consistency theorem
- Robinson–Schensted correspondence
- Robinson–Schensted–Knuth correspondence
- Robust Bayesian analysis
- Robust control
- Robust measures of scale
- Robust optimization
- Robust regression
- Robust statistics
- Robustification
- Rocket City Math League
- Rocky Mountain Journal of Mathematics
- Rod (geometry)
- Rod calculus
- Rod group
- Rodger's method
- Rodrigues' formula
- Rodrigues' rotation formula
- Roe solver
- Rogers polynomials
- Rogers–Ramanujan continued fraction
- Rogers–Ramanujan identities
- Rogers–Szegő polynomials
- Roitman's theorem
- Rokhlin's theorem
- Rolf Schock Prizes
- Rolle's theorem
- Rollo Davidson Prize
- Romaka Siddhanta
- Roman abacus
- Roman dodecahedron
- Roman numerals
- Roman Opałka
- Roman surface
- Romanesco broccoli
- Romanian Master of Mathematics and Sciences
- Romanian numbers
- Romberg's method
- Roof pitch
- Rook polynomial
- Rook's graph
- Room square
- Root (mathematics) (disambiguation)
- Root datum
- Root group
- Root locus
- Root mean square fluctuation
- Root mean square
- Root of unity modulo n
- Root of unity
- Root system of a semi-simple Lie algebra
- Root system
- Root test
- Rooted graph
- Rooted product of graphs
- Root-finding algorithm
- Root-mean-square deviation (bioinformatics)
- Root-mean-square deviation
- Ropelength
- Rosati involution
- Rose (mathematics)
- Rose (topology)
- Rosenbrock function
- Rosenbrock methods
- Rose–Vinet equation of state
- Ross' π lemma
- Rosser's equation
- Rosser's theorem
- Rosser's trick
- Ross–Fahroo lemma
- Ross–Fahroo pseudospectral method
- Rössler attractor
- Ross's conjecture
- Rost invariant
- Rota–Baxter algebra
- Rotary reciprocation
- Rota's basis conjecture
- Rota's conjecture
- Rotating calipers
- Rotation (mathematics)
- Rotation around a fixed axis
- Rotation formalisms in three dimensions
- Rotation group SO(3)
- Rotation group
- Rotation map
- Rotation matrix
- Rotation number
- Rotation of axes
- Rotation operator (vector space)
- Rotation operator
- Rotation system
- Rotation
- Rotational invariance
- Rotational–vibrational coupling
- Rotations in 4-dimensional Euclidean space
- Rothamsted Experimental Station
- Rothe–Hagen identity
- Roth's theorem (disambiguation)
- Rotor (mathematics)
- Rotunda (geometry)
- Rouché–Capelli theorem
- Rouché's theorem
- Rough number
- Rough path
- Rough set
- Roulette (curve)
- Round function
- Round number
- Round robin test
- Rounding
- Round-off error
- Rouse Ball Professor of Mathematics
- Route inspection problem
- Routh–Hurwitz stability criterion
- Routh–Hurwitz theorem
- Routh's theorem
- Row and column spaces
- Row echelon form
- Row equivalence
- Row space
- Row vector
- Rowbottom cardinal
- Royal Statistical Society
- RP (complexity)
- Rprop
- RRQR factorization
- RSA Factoring Challenge
- RSA numbers
- RSA problem
- RSA
- RSA-100
- RSA-1024
- RSA-110
- RSA-120
- RSA-129
- RSA-130
- RSA-140
- RSA-150
- RSA-1536
- RSA-155
- RSA-160
- RSA-170
- RSA-180
- RSA-190
- RSA-200
- RSA-2048
- RSA-210
- RSA-220
- RSA-230
- RSA-232
- RSA-240
- RSA-250
- RSA-260
- RSA-270
- RSA-280
- RSA-290
- RSA-300
- RSA-309
- RSA-310
- RSA-320
- RSA-330
- RSA-340
- RSA-350
- RSA-360
- RSA-370
- RSA-380
- RSA-390
- RSA-400
- RSA-420
- RSA-430
- RSA-440
- RSA-450
- RSA-460
- RSA-470
- RSA-480
- RSA-490
- RSA-500
- RSA-576
- RSA-617
- RSA-640
- RSA-704
- RSA-768
- RSA-896
- RTCP hierarchical aggregation
- Rubik's Cube group
- Rubik's Cube
- Rubik's Revenge
- Rubin Causal Model
- Rudin–Shapiro sequence
- Rudvalis group
- Ruelle zeta function
- Ruffini's rule
- Ruin theory
- Rule complex
- Rule of 72
- Rule of inference
- Rule of marteloio
- Rule of nines (mathematics)
- Rule of product
- Rule of replacement
- Rule of Sarrus
- Rule of succession
- Rule of sum
- Ruled surface
- Ruled variety
- Ruler
- Rules for the Direction of the Mind
- Rules of passage (logic)
- Rulkov map
- Runcinated 120-cell
- Runcinated 24-cell
- Runcinated 5-cell
- Runcinated 5-cube
- Runcinated 5-demicube
- Runcinated 5-orthoplex
- Runcinated 5-simplex
- Runcinated 6-cube
- Runcinated 6-demicube
- Runcinated 6-orthoplex
- Runcinated 6-simplex
- Runcinated 7-cube
- Runcinated 7-orthoplex
- Runcinated 7-simplex
- Runcinated 8-simplex
- Runcinated alternated cubic honeycomb
- Runcinated tesseract
- Runcination
- Runcitruncated cubic honeycomb
- Runge–Kutta method (SDE)
- Runge–Kutta methods
- Runge–Kutta–Fehlberg method
- Runge's phenomenon
- Runge's theorem
- Run-length encoding
- Running total
- Ruppeiner geometry
- Ruppert's algorithm
- Rupture field
- Russell's paradox
- Russo–Dye theorem
- Russo–Vallois integral
- Ruth Lyttle Satter Prize in Mathematics
- Ruth–Aaron pair
- Ruziewicz problem
- RV coefficient
- Rvachev function
- Ryll-Nardzewski fixed-point theorem