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- Apothem
- Appell equations
- Appell polynomials
- Appell transformation
- Applicate
- Applicate z-axis
- Approach space
- Approximate compactness
- Approximate continuity
- Approximate derivative
- Approximate differentiability
- Approximate differential
- Approximate limit
- Approximate tangent plane
- Approximately-compact set
- Approximation
- Approximation by periodic transformations
- Approximation in the mean
- Approximation of a differential boundary value problem by difference boundary value problems
- Approximation of a differential equation by difference equations
- Approximation of a differential operator by difference operators
- Approximation of functions
- Approximation of functions, direct and inverse theorems
- Approximation of functions, extremal problems in function classes
- Approximation of functions, linear methods
- Approximation of functions, measure of
- Approximation of functions of a complex variable
- Approximation of functions of several real variables
- Approximation order
- Approximation solvability
- Approximation theory
- Apéry numbers
- Arabic numerals
- Arakelov geometry
- Arbitration scheme
- Arborescence
- Arbuthnot, John
- Arc
- Arc, contactless (free)
- Arc (projective geometry)
- Arc (topology)
- Arc function
- Archimedean axiom
- Archimedean bodies
- Archimedean class
- Archimedean group
- Archimedean ring
- Archimedean semi-group
- Archimedean spiral
- Arcsine distribution
- Arcsine law
- Arcwise connected space
- Area
- Area-function
- Area formula
- Area function
- Area method
- Area principle
- Arens multiplication
- Arens regularity
- Arf-invariant
- Arguesian lattice
- Argument
- Argument, principle of the
- Arithmetic
- Arithmetic, formal
- Arithmetic-geometric mean process
- Arithmetic continuum
- Arithmetic distribution
- Arithmetic function
- Arithmetic genus
- Arithmetic group
- Arithmetic mean
- Arithmetic number
- Arithmetic progression
- Arithmetic proportion
- Arithmetic root
- Arithmetic series
- Arithmetic space
- Arithmetic triangle
- Arithmetical averages, summation method of
- Arithmetical hierarchy
- Arithmetization
- Arithmetization of analysis
- Aronszajn tree
- Arrangement
- Arrangement of hyperplanes
- Arrow impossibility theorem
- Art gallery theorems
- Artin-Schreier code
- Artin-Schreier theorem
- Artin-Schreier theory
- Artin approximation
- Artin conductor
- Artin root numbers
- Artinian group
- Artinian module
- Artinian ring
- Artin–Hasse exponential
- Artin–Schreier code
- Artin–Schreier theorem
- Artin–Schreier theory
- Arveson spectrum
- Arzela-Ascoli theorem
- Arzela variation
- Arzelà-Ascoli theorem
- Arzelà variation
- Arzelà–Ascoli theorem
- Ascending chain condition
- Ascoli theorem
- Asplund space
- Assertion
- Assignement
- Assignment problem
- Associated function
- Association scheme
- Associative algebra
- Associative calculus
- Associative rings and algebras
- Associativity
- Associator
- Astroid
- Astrometry, mathematical problems of
- Astronomy, mathematical problems of
- Astrophysics, mathematical problems of
- Astrostatistics
- Asymmetric variety
- Asymmetry coefficient
- Asymmetry of a distribution
- Asymptote
- Asymptotic basis
- Asymptotic density
- Asymptotic derivative
- Asymptotic direction
- Asymptotic equality
- Asymptotic expansion
- Asymptotic expression
- Asymptotic formula
- Asymptotic invariant of a group
- Asymptotic limit
- Asymptotic line
- Asymptotic negligibility
- Asymptotic net
- Asymptotic optimality
- Asymptotic point
- Asymptotic power function
- Asymptotic power series
- Asymptotic relative efficiency in testing
- Asymptotic representation
- Asymptotic sequence
- Asymptotic series
- Asymptotic value
- Asymptotically-efficient estimator
- Asymptotically-stable solution
- Asymptotically-unbiased estimator
- Asymptotically-unbiased test
- Asymptotics of arithmetic functions
- Atiyah-Floer conjecture
- Atiyah–Floer conjecture
- Atom
- Atomic distribution
- Atomic interval
- Atomic lattice
- Atomic measure
- Atomic ring
- Atomistic lattice
- Attainable boundary arc
- Attainable boundary point
- Attainable subgroup
- Attraction, partial domain of
- Attraction domain of a stable distribution
- Auto-correlation
- Auto-correlogram
- Auto-oscillation
- Auto-regression
- Auto-regressive process
- Autocovariance
- Automata, algebraic theory of
- Automata, complete systems of
- Automata, composition of
- Automata, equivalence of
- Automata, experiments with
- Automata, homomorphism of
- Automata, methods of specification of
- Automata, minimization of
- Automata, theory of
- Automatic continuity for Banach algebras
- Automatic control theory
- Automatic programming
- Automatic translation
- Automaton
- Automaton, behaviour of an
- Automaton, finite
- Automaton, probabilistic
- Automorphic form
- Automorphic function
- Automorphism
- Automorphism group
- Autonomous system
- Autonymy
- Average
- Average-case computational complexity
- Average order of an arithmetic function
- Average rotation
- Average sample number
- Average value, theorem on variations of the
- Averaging
- Avoidability index
- Avoidable pattern
- Axial vector
- Axiom
- Axiom of choice
- Axiom of constructibility
- Axiom of extensionality
- Axiom scheme
- Axiomatic method
- Axiomatic set theory
- Axiomatized class
- Axonometry
- Azumaya algebra
- B-Phi-structure
- B-convergence
- BBGKY hierarchy
- BCH
- BCH-algebra
- BCI-algebra
- BCK-algebra
- BGG resolution
- BIBD
- BK-space
- BMO-space
- BMOA-space
- Babuska-Lax-Milgram theorem
- Babuška–Lax–Milgram theorem
- Bachelier, Louis
- Backlund transformation
- Baer *-semigroup
- Baer group
- Baer multiplication
- Baer ring
- Baer semi-group
- Baer semigroup
- Baer–Fomin theorem
- Baer–Specker group
- Bahadur efficiency
- Bahadur representation
- Baily-Borel compactification
- Baily–Borel compactification
- Baire-1 function
- Baire category theorem
- Baire classes
- Baire property
- Baire set
- Baire space
- Baire theorem
- Bairstow method
- Baker-Beynon duality
- Baker–Beynon duality
- Baker–Campbell–Hausdorff formula
- Balanced category
- Balanced incomplete block design
- Balanced module
- Balanced ring
- Balanced set
- Balayage method
- Balian-Low theorem
- Balian–Low theorem
- Ball
- Banach-Jordan algebra
- Banach-Jordan pair
- Banach-Mazur compactum
- Banach-Mazur functional
- Banach-Mazur game
- Banach-Saks property
- Banach-Steinhaus theorem
- Banach-Stone theorem
- Banach algebra
- Banach analytic space
- Banach contraction principle
- Banach function algebra
- Banach function space
- Banach indicatrix
- Banach lattice
- Banach limit
- Banach module
- Banach space
- Banach space PostTex
- Banach space of analytic functions with infinite-dimensional domains
- Banach–Alaoglu theorem
- Banach–Jordan algebra
- Banach–Jordan pair
- Banach–Mazur compactum
- Banach–Mazur functional
- Banach–Mazur game
- Banach–Saks property
- Banach–Steinhaus theorem
- Banach–Stone theorem
- Banach–Tarski paradox
- Banaschewski compactification
- Band method
- Band of semi-groups
- Bar induction
- Barban–Davenport–Halberstam theorem
- Barber paradox
- Barbier theorem
- Baric algebra
- Barrelled space
- Barrier
- Bartlett test
- Barycentre
- Barycentric coordinates
- Barycentric subdivision
- Base
- Base change
- Base of a deformation
- Basic commutator
- Basic set
- Basis
- Baskakov operators
- Bateman-Horn conjecture
- Bateman function
- Bateman method
- Bateman–Grosswald constant
- Bateman–Horn conjecture
- Bauer-Fike theorem
- Bauer-Peschl equation
- Bauer simplex
- Bauer–Fike theorem
- Bauer–Peschl equation
- Baumslag-Solitar group
- Baumslag–Solitar group
- Baxter algebra
- Bayes, Thomas
- Bayes formula
- Bayesian approach
- Bayesian approach, empirical
- Bayesian decision function
- Bayesian estimator
- Bayesian numerical analysis
- Bazilevich functions
- Becker-Gottlieb transfer
- Becker–Gottlieb transfer
- Beckman-Quarles-type theorems
- Beckman–Quarles-type theorems
- Behnke-Stein theorem