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- Mellin transform
- Memoryless channel
- Men'shov-Rademacher theorem
- Men'shov example of a zero-series
- Men'shov–Rademacher theorem
- Mendel, Johann Gregor
- Menelaus theorem
- Menger curve
- Mercer theorem
- Mergelyan theorem
- Meromorphic function
- Meromorphic mapping
- Mersenne number
- Mersenne prime
- Mertens conjecture
- Meta-Abelian group
- Meta-language
- Meta-logic
- Meta-mathematics
- Meta-nilpotent group
- Meta-theorem
- Meta-theory
- Metacyclic group
- Meteorology, mathematical problems in
- Method of boundary integration
- Method of characteristics
- Method of extensions and restrictions
- Method of steepest descent (for integrals)
- Method of undetermined coefficients in developing numerical algorithms
- Metric
- Metric connection
- Metric dimension
- Metric entropy
- Metric isomorphism
- Metric outer measure
- Metric projection
- Metric space
- Metric tensor
- Metric theory of functions
- Metric theory of numbers
- Metric transitivity
- Metrizable space
- Meusnier theorem
- Meyer, Anton
- Michaelis-Menten equation
- Michaelis–Menten equation
- Micro-bundle
- Microlocal analysis
- Mikhailov criterion
- Milne method
- Milne problem
- Milnor sphere
- Milnor unknotting conjecture
- Minimal discrepancy method
- Minimal functional calculus
- Minimal ideal
- Minimal iteration method
- Minimal model
- Minimal normal subgroup
- Minimal polynomial of a matrix
- Minimal property
- Minimal propositional calculus
- Minimal set
- Minimal simple group
- Minimal sufficient statistic
- Minimal surface
- Minimax
- Minimax estimator
- Minimax principle
- Minimax property
- Minimax statistical procedure
- Minimization methods for functions depending strongly on a few variables
- Minimization of an area
- Minimization of the labour of calculation
- Minimizing sequence
- Minimizing sequence for an operator
- Minimum
- Minimum spanning tree
- Minkowski addition
- Minkowski geometry
- Minkowski hypothesis
- Minkowski inequality
- Minkowski problem
- Minkowski space
- Minkowski theorem
- Minkowski–Farkas theorem
- Minor
- Minor of a graph
- Minorant
- Minute
- Mises, Richard von
- Mittag-Leffler function
- Mittag-Leffler star
- Mittag-Leffler summation method
- Mittag-Leffler theorem
- Mixed-type differential equation
- Mixed-volume theory
- Mixed and boundary value problems for hyperbolic equations and systems
- Mixed and boundary value problems for parabolic equations and systems
- Mixed autoregressive moving-average process
- Mixed group
- Mixed integer programming problem
- Mixed integral equation
- Mixed problem
- Mixed product
- Mixing
- Mixture models
- Modal logic
- Modality
- Mode
- Model, mathematical
- Model, regular
- Model-based geostatistics
- Model (in logic)
- Model for calculations
- Model selection
- Model theory
- Model theory of the real exponential function
- Model theory of valued fields
- Modeling count data
- Modification
- Modular curve
- Modular form
- Modular function
- Modular group
- Modular group algebra
- Modular ideal
- Modular lattice
- Module
- Modules, category of
- Moduli of a Riemann surface
- Moduli problem
- Moduli theory
- Modulo
- Modulus
- Modulus in algebraic number theory
- Modulus of a family of curves
- Modulus of an annulus
- Modulus of an automorphism
- Modulus of an elliptic integral
- Modus ponens
- Moebius function
- Moebius inversion
- Moebius plane
- Moebius series
- Moebius strip
- Moivre, Abraham de
- Moment
- Moment matrix
- Moment problem
- Moments, method of
- Moments, method of (in probability theory)
- Momentum mapping
- Monar
- Monge-Ampere equation
- Monge-Ampère equation
- Monge cone
- Monge equation
- Monge–Ampère equation
- Monodromic function
- Monodromy group
- Monodromy matrix
- Monodromy operator
- Monodromy theorem
- Monodromy transformation
- Monogeneity set
- Monogenic field
- Monogenic function
- Monogenic semi-group
- Monoid
- Monoid algebra
- Monoidal category
- Monoidal transformation
- Monomial
- Monomial matrix
- Monomial representation
- Monomial substitutions, group of
- Monomorphism
- Monospline
- Monotone Boolean function
- Monotone function
- Monotone mapping
- Monotone operator
- Monotone sequence
- Monte-Carlo method
- Monte-Carlo methods for partial differential equations
- Montel space
- Montel theorem
- Montesinos-Nakanishi conjecture
- Montesinos–Nakanishi conjecture
- Montmort, Pierre Rémond de
- Montmort matching problem
- Monty Hall problem
- Monty hall problem
- Moonshine conjectures
- Moore determinant
- Moore space
- Mordell conjecture
- Mordellic variety
- Moreau envelope function
- Morera theorem
- Morgan, Augustus de
- Mori theory of extremal rays
- Morita conjectures
- Morita equivalence
- Morley rank
- Morphic word
- Morphism
- Morrey spaces
- Morse-Smale system
- Morse function
- Morse index
- Morse inequalities
- Morse lemma
- Morse surgery
- Morse theory
- Morse–Hedlund theorem
- Morse–Smale system
- Moser-Trudinger inequality
- Moser–Trudinger inequality
- Most-powerful test
- Motion
- Motives, theory of
- Motzkin transposition theorem
- Moufang loop
- Moufang–Lie algebra
- Moulding surface
- Moutard transformation
- Movable singular point
- Movable space
- Moving-average process
- Moving-frame method
- Muentz theorem
- Multi-algebra
- Multi-criteria decision making
- Multi-criterion problem
- Multi-dimensional distribution
- Multi-dimensional knot
- Multi-dimensional logarithmic residues
- Multi-dimensional statistical analysis
- Multi-dimensional variational problem
- Multi-extremum problem
- Multi-field potential
- Multi-functor
- Multi-group approximation
- Multi-index notation
- Multi-objective optimization
- Multi-operator group
- Multi-pole potential
- Multi-sheeted region
- Multi-valued function
- Multi-valued mapping
- Multi-valued representation
- Multigraph
- Multiharmonic function
- Multiindex
- Multilinear algebra
- Multilinear form
- Multilinear mapping
- Multimodal distribution
- Multinomial coefficient
- Multinomial distribution
- Multipartite graph
- Multiple
- Multiple-correlation coefficient
- Multiple comparison
- Multiple integral
- Multiple point
- Multiple recursion
- Multiple sequence
- Multiple series
- Multiplication
- Multiplication of distributions
- Multiplicative arithmetic function
- Multiplicative ergodic theorem
- Multiplicative group
- Multiplicative lattice
- Multiplicative semi-group
- Multiplicative system
- Multiplicity of a module
- Multiplicity of a singular point
- Multiplicity of a weight
- Multiplier group
- Multiplier sequence space
- Multiplier theory
- Multipliers
- Multipliers-of-C*-algebras
- Multiply-connected domain
- Multiset
- Multivalent function
- Mumford hypothesis
- Mutual information
- Mutual kernels
- Mutually-prime numbers
- Mutually-singular measures
- Myope topology
- Möbius function
- Möbius inversion
- Möbius plane
- Möbius series
- Möbius strip
- Müntz theorem
- N-group
- NP
- NP-complete
- NPSPACE
- Nagel point
- Nakayama lemma
- Naked singularity
- Name
- Namioka space
- Namioka theorem
- Napier number
- Narayama number
- Nash theorem (in game theory)
- Nash theorems (in differential geometry)
- Natural coordinate frame
- Natural density
- Natural equation
- Natural exponential family of probability distributions
- Natural frequencies
- Natural function
- Natural language processing
- Natural logical deduction
- Natural number
- Natural numbers object
- Natural operator in differential geometry
- Natural parameter
- Natural selection in search and computation
- Natural sequence
- Natural transformation
- Natural transformation in differential geometry
- Naturally ordered groupoid
- Navier-Stokes equations
- Navier–Stokes equations
- Near-ring
- Necessary and sufficient conditions
- Necessary sufficient statistic
- Negation
- Negative binomial distribution
- Negative correlation
- Negative curvature, surface of
- Negative exponential distribution
- Negative hypergeometric distribution
- Negative polynomial distribution