List of mathematics articles

O

O-minimal theory -- O'Nan group -- O(n) -- Obelus -- Object language -- Object of the mind -- Object theory -- Oblate spheroid -- Oblate spheroidal coordinates -- Oblique projection -- Oblique reflection -- Observability -- Observability Gramian -- Observable subgroup -- Observable variable -- Observational study -- Obstacle avoidance -- Obstacle problem -- Obstruction theory -- Occupancy theorem -- Occurrences of Grandi's series -- Occurs check -- Octacross -- Octacube (mathematics) -- Octadecagon -- Octadecimal -- Octaexon -- Octagon -- Octagonal antiprism -- Octagonal bipyramid -- Octagonal number -- Octagonal prism -- Octagonal trapezohedron -- Octagram -- Octahedral number -- Octahedral prism -- Octahedral symmetry -- Octahedron -- Octahemioctacron -- Octahemioctahedron -- Octal -- Octal game -- Octal games -- Octant -- Octeract -- Octeractic honeycomb -- Octomino -- Octonion -- Octonion algebra --

Odd

Odd graph -- Odd greedy expansion -- Odd number theorem -- Odds -- Odds algorithm -- Odds ratio -- Odlyzko–Schönhage algorithm -- Of the form -- Offered load -- Official statistics -- Offset binary -- Ogden's lemma -- Ogive -- Olami–Feder–Christensen model -- Olbers' paradox -- Oligomorphic group -- Olimpíada Brasileira de Matemática -- Oloid -- Olympiade Mathématique Belge -- OMDoc -- Omega and agemo subgroup -- Omega constant -- Omega equation -- Omega-logic -- Omitted-variable bias -- Omnibus test -- Omnitruncated 120-cell -- Omnitruncated 24-cell -- Omnitruncated 5-cell -- Omnitruncated 6-simplex -- Omnitruncated cubic honeycomb -- Omnitruncated hexateron -- Omnitruncated tesseract -- Omnitruncated triangular-hexagonal prismatic honeycomb -- Omnitruncation --

On

On Formally Undecidable Propositions of Principia Mathematica and Related Systems -- On-Line Encyclopedia of Integer Sequences -- On Numbers and Games -- On Spirals -- On the Number of Primes Less Than a Given Magnitude -- On the Sphere and Cylinder -- One-dimensional symmetry group -- One-form -- One half -- One-parameter group -- One-seventh area triangle -- One-sided limit -- One-way ANOVA -- One-way function -- Online codes -- Online NMF -- Ono's inequality -- Onsager reciprocal relations -- Ontological maximalism -- Open and closed maps -- Open book decomposition -- Open coloring axiom -- Open-loop model -- Open mapping theorem -- Open mapping theorem (complex analysis) -- Open mapping theorem (functional analysis) -- Open sentence -- Open set -- OpenMath -- Operad theory -- Operand -- Operation (mathematics) -- Operation theory -- Operational calculus -- Operations research -- Operator -- Operator (physics) -- Operator algebra -- Operator associativity -- Operator K-theory -- Operator norm -- Operator space -- Operator system -- Operator theory -- Operator topology --

Opi

Opial property -- Opinion poll -- Oppenheim conjecture -- Opposite -- Opposite category -- Opposite ring -- Opposites theorem -- Optical axis -- Opticks -- Optimal control -- Optimal design -- Optimal discriminant analysis -- Optimal matching -- Optimal stopping -- Optimal substructure -- Optimality criterion -- Optimization (computer science) -- Optimization (mathematics) -- Optional stopping theorem -- Opuscula Mathematica -- Oracle machine -- Orbifold -- Orbifold notation -- Orbit (dynamics) -- Orbit method -- Orbit portrait -- Orbital integral -- Orbital momentum vector -- Orbital state vectors -- Order (graph theory) -- Order (group theory) -- Order (mathematics) -- Order (number theory) -- Order (ring theory) -- Order-3 bisected heptagonal tiling -- Order-3 heptagonal tiling -- Order-3 icosahedral honeycomb -- Order-3 snub heptagonal tiling -- Order-3 truncated heptagonal tiling -- Order-4 dodecahedral honeycomb -- Order-4 pentagonal tiling -- Order-5 cubic honeycomb -- Order-5 dodecahedral honeycomb -- Order-5 square tiling -- Order-7 triangular tiling -- Order-7 truncated triangular tiling -- Order dimension -- Order-embedding -- Order-extension principle -- Order isomorphism -- Order of a kernel -- Order of integration (calculus) -- Order of magnitude -- Order of operations -- Order statistic -- Order theory -- Order topology -- Order type -- Ordered exponential -- Ordered field -- Ordered geometry -- Ordered graph -- Ordered logit -- Ordered pair -- Ordered partition of a set -- Ordered probit -- Ordered ring -- Ordered semigroup -- Ordered set -- Ordered subset expectation maximization -- Ordered vector space -- Orders of approximation -- Ordinal analysis -- Ordinal arithmetic -- Ordinal collapsing function -- Ordinal definable set -- Ordinal notation -- Ordinal number -- Ordinal number (linguistics) -- Ordinal optimization -- Ordinal scale -- Ordinary differential equation -- Ordinary least squares -- Ordinary mathematics -- Ordinate -- Ordination (statistics) --

Ore

Ore condition -- Ore extension -- Ore's theorem -- Organon -- Orientability -- Orientation (geometry) -- Orientation (mathematics) -- Orientation character -- Orientation entanglement -- Oriented coloring -- Oriented matroid -- Oriented projective geometry -- Orientifold -- Origin (mathematics) -- Original proof of Gödel's completeness theorem -- Ornstein–Uhlenbeck operator -- Ornstein–Uhlenbeck process -- Ornstein–Zernike equation -- Orthant -- Orthocentric system -- Orthocompact space -- Orthogonal collocation -- Orthogonal complement -- Orthogonal convex hull -- Orthogonal coordinates -- Orthogonal functions -- Orthogonal group -- Orthogonal matrix -- Orthogonal polynomials -- Orthogonal Procrustes problem -- Orthogonal trajectory -- Orthogonal wavelet -- Orthogonality -- Orthogonality (term rewriting) -- Orthogonality principle -- Orthogonalization -- Orthographic projection -- Orthographic projection (cartography) -- Orthographic projection (geometry) -- Orthometric height -- Orthonormal basis -- Orthonormal frame -- Orthonormal function system -- Orthonormality -- Orthostochastic matrix -- Ortsbogen theorem --

Osc

Oscillating reciprocation -- Oscillation -- Oscillation (differential equation) -- Oscillation (mathematics) -- Oscillator linewidth -- Oscillator Toda -- Oscillon -- Osculating circle -- Osculating curve -- Osculating plane -- Oseledets theorem -- Osmund Lewry -- Ostomachion -- Ostrowski–Hadamard gap theorem -- Ostrowski Prize -- Ostrowski's theorem -- Oswald Veblen Prize in Geometry -- Out(Fn) -- Outcome (game theory) -- Outer automorphism -- Outer automorphism group -- Outer billiard -- Outer measure -- Outer product -- Outlier -- Outline of arithmetic -- Outline of calculus -- Outline of category theory -- Outline of combinatorics -- Outline of discrete mathematics -- Outline of geometry -- Outline of logic -- Outline of probability -- Outline of regression analysis -- Outline of statistics -- Outline of trigonometry --

Ova

Oval -- Oval (projective plane) -- Overconvergent modular form -- Overdetermined system -- Overdispersion -- Overfitting -- Overfull graph -- Overlap (term rewriting) -- Overlap-add method -- Overlap coefficient -- Overlap matrix -- Overlap-save method -- Overlapping interval topology -- Overring -- Overspill -- Ovoid (polar space) -- Ovoid (projective geometry) -- Oxford Set of Mathematical Instruments --