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- Lemoine point
- Length
- Length-and-area principle
- Length of a partially ordered set
- Lens space
- Lenstra polynomial-time theorem
- Leopoldt conjecture
- Leray formula
- Leray spectral sequence
- Leslie matrix
- Letter
- Level lines
- Level set
- Levi-Civita connection
- Levi-Mal'tsev decomposition
- Levi condition
- Levi problem
- Levitskii radical
- Levi–Mal'tsev decomposition
- Levy-Cramer theorem
- Levy-Khinchin canonical representation
- Levy-Prokhorov metric
- Levy canonical representation
- Levy inequality
- Levy metric
- Lewy operator and Mizohata operator
- Lexicographic order
- Lexicographic product
- Lexis, Wilhelm
- Liar paradox
- Lie-Kolchin theorem
- Lie-admissible algebra
- Lie-group, p-adic
- Lie-group-adic
- Lie algebra
- Lie algebra, algebraic
- Lie algebra, exceptional
- Lie algebra, exponential
- Lie algebra, free
- Lie algebra, fully-solvable
- Lie algebra, graded
- Lie algebra, linear
- Lie algebra, local
- Lie algebra, nil
- Lie algebra, nilpotent
- Lie algebra, reductive
- Lie algebra, semi-simple
- Lie algebra, solvable
- Lie algebra, supersolvable
- Lie algebra of an algebraic group
- Lie algebra of an analytic group
- Lie algebras, variety of
- Lie algebroid
- Lie bracket
- Lie derivative
- Lie differential
- Lie differentiation
- Lie group
- Lie group, Banach
- Lie group, compact
- Lie group, derived
- Lie group, exponential
- Lie group, fully-solvable
- Lie group, local
- Lie group, nilpotent
- Lie group, p-adic
- Lie group, semi-simple
- Lie group, solvable
- Lie group, supersolvable
- Lie p-algebra
- Lie polynomial
- Lie quadric
- Lie ring
- Lie symmetry analysis
- Lie ternary system
- Lie theorem
- Lie transformation group
- Lie triple system
- Lieb-Thirring inequalities
- Lieb–Thirring inequalities
- Lienard-Chipart criterion
- Lienard equation
- Lie–Kolchin theorem
- Likelihood-ratio test
- Likelihood equation
- Limes inferior
- Limes superior
- Limit
- Limit-absorption principle
- Limit cardinal
- Limit cone
- Limit cycle
- Limit elements
- Limit of star-likeness
- Limit ordinal
- Limit point of a set
- Limit point of a trajectory
- Limit set
- Limit set of a trajectory
- Limit theorems
- Limiting-amplitude principle
- Lindeberg, Jarl Waldemar
- Lindeberg-Feller theorem
- Lindeberg–Feller theorem
- Lindelof construction
- Lindelof hypothesis
- Lindelof principle
- Lindelof space
- Lindelof summation method
- Lindelof theorem
- Lindelöf construction
- Lindelöf hypothesis
- Lindelöf number
- Lindelöf principle
- Lindelöf space
- Lindelöf summation method
- Lindelöf theorem
- Lindemann theorem
- Lindemann–Weierstrass theorem
- Lindenbaum method
- Line (curve)
- Line graph
- Linear-algebra(2)
- Linear algebra
- Linear algebra, numerical methods in
- Linear algebra software packages
- Linear algebraic equation
- Linear algebraic group
- Linear algebraic groups, arithmetic theory of
- Linear angle
- Linear boundary value problem
- Linear boundary value problem, numerical methods
- Linear classical group
- Linear closure
- Linear code
- Linear complexity of a sequence
- Linear complexity profile
- Linear congruential method
- Linear connection
- Linear dependence
- Linear differential equation in a Banach space
- Linear differential operator
- Linear elliptic partial differential equation and system
- Linear equation
- Linear estimator
- Linear form
- Linear form in logarithms
- Linear function
- Linear functional
- Linear group
- Linear hull
- Linear hyperbolic partial differential equation and system
- Linear hypothesis
- Linear independence
- Linear independence, measure of
- Linear inequality
- Linear integral equation
- Linear interpolation
- Linear mixed model
- Linear mixed models
- Linear operator
- Linear order
- Linear ordinary differential equation
- Linear ordinary differential equation of the second order
- Linear ordinary differential equation with constant coefficients
- Linear parabolic partial differential equation and system
- Linear partial differential equation
- Linear programming
- Linear regression
- Linear representation
- Linear representation, invariant of a
- Linear skein
- Linear space
- Linear span
- Linear subspace
- Linear summation method
- Linear system
- Linear system of differential equations with almost-periodic coefficients
- Linear system of differential equations with periodic coefficients
- Linear topological space
- Linear topology
- Linear transformation
- Linear variety
- Linearised polynomial
- Linearization methods
- Linearly-compact module
- Linearly-disjoint extensions
- Linearly-regular random process
- Linearly ordered set
- Link
- Linking coefficient
- Linnik discrete ergodic method
- Liouville-Lojasiewicz inequality
- Liouville-Ostrogradski formula
- Liouville-equation(2)
- Liouville-Łojasiewicz inequality
- Liouville equation
- Liouville function
- Liouville net
- Liouville normal form
- Liouville number
- Liouville surface
- Liouville theorems
- Liouville–Ostrogradski formula
- Liouville–Łojasiewicz inequality
- Lipschitz Function
- Lipschitz condition
- Lipschitz constant
- Lipschitz function
- Lipschitz integral condition
- Lisp
- Listing knot
- Listing polynomials
- Littlewood polynomial
- Littlewood problem
- Lituus
- Liénard-Chipart criterion
- Liénard equation
- Liénard–Chipart criterion
- Lobachevskii criterion (for convergence)
- Lobachevskii function
- Lobachevskii geometry
- Lobachevskii method
- Lobachevskii space
- Lobatto quadrature formula
- Local-global principles for large rings of algebraic integers
- Local-global principles for the ring of algebraic integers
- Local and residual properties
- Local approximation of functions
- Local base
- Local cohomology
- Local decomposition
- Local differential geometry
- Local dimension
- Local field
- Local homeomorphism
- Local homology
- Local limit theorems
- Local linking
- Local normal forms for dynamical systems
- Local property
- Local ring
- Local structural stability
- Local structure of trajectories
- Local tomography
- Local topological group
- Local uniformization
- Local uniformizing parameter
- Local variations, method of
- Locale
- Locality principle
- Localization in a commutative algebra
- Localization in categories
- Localization principle
- Locally algebraic operator
- Locally closed set
- Locally compact skew-field
- Locally compact space
- Locally connected continuum
- Locally connected space
- Locally convex lattice
- Locally convex space
- Locally convex topology
- Locally cyclic group
- Locally finite algebra
- Locally finite covering
- Locally finite family
- Locally finite group
- Locally finite order
- Locally finite semi-group
- Locally flat imbedding
- Locally free group
- Locally free sheaf
- Locally integrable function
- Locally nilpotent algebra
- Locally nilpotent group
- Locally normal group
- Locally path-connected space
- Locally small category
- Locally solvable algebra
- Locally solvable group
- Locally trivial fibre bundle
- Loday algebra
- Log-normal distribution
- Logarithm of a number
- Logarithmic branch point
- Logarithmic capacity
- Logarithmic convergence criterion
- Logarithmic derivative
- Logarithmic function
- Logarithmic height
- Logarithmic integral
- Logarithmic normal distribution
- Logarithmic paper
- Logarithmic potential
- Logarithmic residue
- Logarithmic spiral
- Logarithmic summation method
- Logarithmically-subharmonic function
- Logic programming
- Logical axiom
- Logical calculus
- Logical consequence
- Logical formula
- Logical function
- Logical law
- Logical matrix
- Logical operation
- Logicism
- Logico-mathematical calculus
- Logistic distribution
- Logistic models
- Logistic regression
- Logistics
- Logit regression
- Lojasiewicz-Simon inequality
- Lojasiewicz inequality
- Lommel function
- Lommel polynomial
- Longman method
- Loop
- Loop, analytic
- Loop (in topology)
- Loop group
- Loop space
- Lorentz force
- Lorentz group
- Lorentz transformation
- Lorenz attractor
- Lorenz equations
- Loss function
- Lovasz local lemma
- Lovász local lemma
- Low-dimensional topology, problems in
- Lowenheim-Skolem theorem
- Lower bound
- Lower bound of a family of topologies
- Lower central series
- Lower limit
- Lower radical
- Lowner-Heinz inequality
- Lowner equation
- Lowner method
- Loxodrome
- Lp spaces