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- Osculating sphere
- Osculation
- Osgood condition
- Osgood criterion
- Osserman conjecture
- Osterwalder–Schrader axioms
- Ostrogradski-Liouville formula
- Ostrogradski formula
- Ostrogradski method
- Ostrogradski–Liouville formula
- Outer automorphism
- Outer measure
- Outlier
- Oval
- Over-convergence
- Overdetermined system
- Overlapping shuffle
- Ovoid
- Ovoid(2)
- P-Sasakian manifold
- P-adic number
- P-adic valuation
- P-adically closed field
- P-divisible group
- P-group
- P-part of a group element of finite order
- P-point
- P-rank
- P-space
- PAC
- PI-algebra
- PL/I
- PSPACE
- Packing
- Pade approximation
- Padé approximation
- Page theorem
- Painleve-type equations
- Painleve equation
- Painleve problem
- Painleve test
- Painleve theorem
- Painlevé-type equations
- Painlevé equation
- Painlevé problem
- Painlevé test
- Painlevé theorem
- Paired comparison model
- Pairing
- Pairwise balanced design
- Paley-Wiener theorem
- Paley–Wiener theorem
- Pap adjoint theorem
- Papperitz equation
- Pappus axiom
- Parabola
- Parabola method
- Parabolic-equation method
- Parabolic coordinates
- Parabolic cylinder
- Parabolic cylinder function
- Parabolic partial differential equation
- Parabolic partial differential equation, numerical methods
- Parabolic point
- Parabolic regression
- Parabolic spiral
- Parabolic subalgebra
- Parabolic subgroup
- Paraboloid
- Paraboloidal coordinates
- Paracompact space
- Paracompactness criteria
- Paraconsistent logic
- Paradox
- Parallel displacement
- Parallel displacement(2)
- Parallel field
- Parallel lines
- Parallel programming
- Parallel random access machine
- Parallel straight lines
- Parallel surfaces
- Parallel translation
- Parallel transport
- Parallelism, absolute
- Parallelism axiom
- Parallelizable manifold
- Parallelogram
- Parallelohedron
- Parallelopipedon
- Parallelotope
- Parameter, method of variation of the
- Parameter-dependent integral
- Parameter-introduction method
- Parametric equation
- Parametric integral-representation method
- Parametric programming
- Parametric representation
- Parametric representation method
- Parametric representation of univalent functions
- Parametric resonance, mathematical theory of
- Parametrix method
- Parastrophy
- Pareto, Vilfredo Federigo Samaso
- Pareto distribution
- Parikh vector
- Parity check
- Parovichenko algebra
- Parseval-Plancherel formula
- Parseval equality
- Parseval–Plancherel formula
- Partial Fourier sum
- Partial correlation coefficient
- Partial derivative
- Partial differential
- Partial differential equation
- Partial differential equations, property C for
- Partial differential equations on a manifold
- Partial geometry
- Partial limit
- Partial order
- Partial problem of eigen values
- Partial recursive function
- Partial recursive operator
- Partially balanced incomplete block design
- Partially ordered group
- Partially ordered set
- Partially specified matrices, completion of
- Particle method
- Partition
- Partition function (number theory)
- Partition function (statistical physics)
- Partition models
- Pascal, Blaise
- Pascal distribution
- Pascal geometry
- Pascal limacon
- Pascal limaçon
- Pascal theorem
- Pascal triangle
- Pasch axiom
- Pasch configuration
- Passive constraint
- Path
- Path-connected space
- Path integral
- Path space
- Pattern recognition
- Pauli algebra
- Pauli matrices
- Paving
- Peano axioms
- Peano curve
- Peano derivative
- Peano theorem
- Pearl-Verhulst logistic process
- Pearl–Verhulst logistic process
- Pearson, Egon Sharpe
- Pearson, Karl
- Pearson curves
- Pearson differential equation
- Pearson distribution
- Pearson product-moment correlation coefficient
- Peck poset
- Peclet number
- Pedal curve
- Peirce arrow
- Peirce decomposition
- Pell's equation
- Pell equation
- Penalty functions, method of
- Pendulum equation
- Penrose cosmic censorship
- Penrose tiling
- Penrose transform
- Pentaspherical coordinates
- Percentile
- Perfect compactification
- Perfect field
- Perfect group
- Perfect irreducible mapping
- Perfect mapping
- Perfect matching
- Perfect measure
- Perfect normal form
- Perfect number
- Perfect ring
- Perfect set
- Perfectly-normal space
- Performance analysis
- Perimeter
- Period mapping
- Period of a function
- Period of a group
- Periodic function
- Periodic group
- Periodic point
- Periodic semi-group
- Periodic solution
- Periodic trajectory
- Periodogram
- Peripherically-compact space
- Permanent
- Permissible law (inference)
- Permutation
- Permutation group
- Permutation matrix
- Permutation of a set
- Permutation relationships
- Permutation test
- Permutator
- Perpendicular
- Perpendicular straight lines
- Perron-Frobenius theorem
- Perron-Stieltjes integral
- Perron integral
- Perron method
- Perron transformation
- Perron–Frobenius theorem
- Perron–Stieltjes integral
- Persian curve
- Perspective
- Perturbation of a linear system
- Perturbation theory
- Pesin theory
- Peter-Weyl theorem
- Petersen graph
- Peterson-Codazzi equations
- Peterson correspondence
- Peterson surface
- Peterson–Codazzi equations
- Petersson conjecture
- Peter–Weyl theorem
- Petri net
- Petrov classification
- Pettis integral
- Pfaffian
- Pfaffian equation
- Pfaffian form
- Pfaffian problem
- Pfaffian structure
- Pfaffian system
- Phase equilibrium diagram
- Phase integral, method of the
- Phase plane
- Phase space
- Phase trajectory
- Phase transition
- Phase velocity vector
- Phragmen-Lindelof theorem
- Phragmén-Lindelöf theorem
- Phragmén–Lindelöf theorem
- Pi(number)
- Pi-separable group
- Pi-solvable group
- Picard-Lindelof theorem
- Picard existence theorem
- Picard group
- Picard scheme
- Picard theorem
- Picard variety
- Pick theorem
- Pictures
- Piecewise-linear topology
- Pierpont variation
- Pierre de Fermat
- Pisot number
- Pisot sequence
- Pitman, Edwin James George
- Pitman estimator
- Pixley–Roy hyperspace
- Place of a field
- Plancherel formula
- Plancherel theorem
- Planck constant
- Plane
- Plane real algebraic curve
- Plane trigonometry
- Planigon
- Plasticity, mathematical theory of
- Plateau problem
- Plateau problem, multi-dimensional
- Platonic solids
- Player
- Playfair, William
- Playfair axiom
- Plenary power
- Plessner theorem
- Pluecker coordinates
- Pluecker formulas
- Pluecker interpretation
- Pluming
- Pluriharmonic function
- Pluripotential theory
- Plurisubharmonic function
- Plurisuperharmonic function
- Plus-construction
- Plücker coordinates
- Plücker formulas
- Plücker interpretation
- Po-group
- Pochhammer equation
- Pochhammer symbol
- Pohlke-Schwarz theorem
- Pohlke–Schwarz theorem
- Poincare-Bendixson theory
- Poincare-Bertrand formula
- Poincare-Dulac theorem
- Poincare-Hopf theorem
- Poincare complex
- Poincare conjecture
- Poincare divisor
- Poincare duality
- Poincare equations
- Poincare group
- Poincare last theorem
- Poincare mapping
- Poincare model
- Poincare problem
- Poincare return map
- Poincare return theorem
- Poincare space
- Poincare sphere
- Poincare theorem
- Poincare theorem in stability theory
- Poincaré-Bendixson theory
- Poincaré-Bertrand formula
- Poincaré-Dulac theorem
- Poincaré-Hopf theorem
- Poincaré complex
- Poincaré conjecture
- Poincaré divisor
- Poincaré duality
- Poincaré equations
- Poincaré group
- Poincaré inequality
- Poincaré last theorem
- Poincaré mapping
- Poincaré model
- Poincaré problem
- Poincaré return map
- Poincaré return theorem
- Poincaré space
- Poincaré sphere
- Poincaré theorem