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- 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
- Poincaré theorem in stability theory
- Poincaré–Bendixson theory
- Poincaré–Bertrand formula
- Poincaré–Dulac theorem
- Poincaré–Hopf theorem
- Point (decimal point, floating point)
- Point estimator
- Point in general position
- Point of cessation
- Point of inflection
- Point of rectification
- Pointed object
- Pointed set
- Pointed space
- Pointwise addition
- Pointwise convergence
- Pointwise convergence, topology of
- Pointwise limit
- Pointwise multiplication
- Pointwise operation
- Pointwise order
- Pointwise remainder
- Poiseuille flow
- Poisson, Simeon-Denis
- Poisson-gamma mixture model
- Poisson Lie group
- Poisson algebra
- Poisson brackets
- Poisson distribution
- Poisson equation
- Poisson equation, numerical methods
- Poisson flow
- Poisson formula
- Poisson formula for harmonic functions
- Poisson integral
- Poisson manifold
- Poisson process
- Poisson stability
- Poisson summation formula
- Poisson summation method
- Poisson theorem
- Poisson transform
- Polar
- Polar body
- Polar coordinates
- Polar correspondence
- Polar decomposition
- Polar set
- Polar space
- Polarisation identity
- Polarity
- Polarization identity
- Polarized algebraic variety
- Pole
- Pole (of a function)
- Pole assignment problem
- Polish space
- Pollaczek, Félix
- Poly-analytic function
- Poly-harmonic function
- Poly-nilpotent group
- Poly-vector
- Polya distribution
- Polya theorem
- Polycyclic group
- Polydisc
- Polygon
- Polygon (over a monoid)
- Polygonal number
- Polyhedral angle
- Polyhedral chain
- Polyhedral complex
- Polyhedral cycle
- Polyhedral metric
- Polyhedron
- Polyhedron, abstract
- Polyhedron group
- Polylogarithms
- Polynomial
- Polynomial and exponential growth in groups and algebras
- Polynomial convexity
- Polynomial function
- Polynomial least deviating from zero
- Polynomial of best approximation
- Polynomial ring
- Polytope
- Pompeiu problem
- Pontryagin character
- Pontryagin class
- Pontryagin duality
- Pontryagin invariant
- Pontryagin maximum principle
- Pontryagin number
- Pontryagin space
- Pontryagin square
- Pontryagin surface
- Porosity point
- Portfolio optimization
- Portion
- Poset
- Positional game
- Positive-definite form
- Positive-definite function
- Positive-definite function on a group
- Positive-definite kernel
- Positive-definite operator
- Positive cone
- Positive correlation
- Positive element
- Positive functional
- Positive link
- Positive operator
- Positive propositional calculus
- Positive sequence
- Positive variation of a function
- Positive vector bundle
- Post algebra
- Post canonical system
- Post class
- Post correspondence problem
- Post lattice
- Post machine
- Post normal system
- Post production system
- Posterior distribution
- Postnikov square
- Postnikov system
- Potential
- Potential field
- Potential net
- Potential of a mass distribution
- Potential operator
- Potential theory
- Potential theory, abstract
- Potential theory, inverse problems in
- Potential theory, mixed boundary value problems of
- Potentials, method of
- Power
- Power-full number
- Power associativity
- Power function
- Power function/Fig1
- Power function of a test
- Power of a statistical test
- Power residue
- Power series
- Power set
- Prandtl equation
- Prandtl number
- Pre-Hilbert space
- Pre-base
- Pre-compact space
- Pre-lambda-ring
- Pre-measure
- Pre-norm
- Pre-order
- Pre-orderable group
- Pre-sheaf
- Pre-topological space
- Predator-prey system
- Predicate
- Predicate calculus
- Predicate symbol
- Predicate variable
- Predicativity
- Predictable random process
- Predictable sigma-algebra
- Preference relation