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- 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
- Behnke–Stein theorem
- Behrens-Fisher problem
- Behrens–Fisher problem
- Beilinson conjectures
- Bell-shaped game
- Bell inequalities
- Bell numbers
- Bell polynomial
- Bellman-Gronwall inequality
- Bellman-Gronwall lemma
- Bellman-Harris process
- Bellman equation
- Bellman–Gronwall inequality
- Bellman–Harris process
- Belousov-Zhabotinskii reaction
- Belousov–Zhabotinskii reaction
- Beltrami-Enneper theorem
- Beltrami coordinates
- Beltrami equation
- Beltrami interpretation
- Beltrami method
- Beltrami–Enneper theorem
- Bendixson criterion
- Bendixson sphere
- Bendixson transformation
- Benford law
- Benjamin-Bona-Mahony equation
- Benjamin-Feir instability
- Benjamin–Bona–Mahony equation
- Benjamin–Feir instability
- Benz plane
- Berezin transform
- Berger inequality
- Bergman-Shilov boundary
- Bergman-Weil representation
- Bergman integral operator
- Bergman kernel function
- Bergman spaces
- Bergman–Shilov boundary
- Bergman–Weil representation
- Berlekamp-Massey algorithm
- Berlekamp–Massey algorithm
- Berman class
- Bernoulli, Daniel
- Bernoulli, Jakob
- Bernoulli, Nicolaus
- Bernoulli automorphism
- Bernoulli distribution
- Bernoulli equation
- Bernoulli excursion
- Bernoulli experiment
- Bernoulli integral
- Bernoulli lemniscate
- Bernoulli measure
- Bernoulli method
- Bernoulli numbers
- Bernoulli polynomials
- Bernoulli random walk
- Bernoulli regression
- Bernoulli scheme
- Bernoulli theorem
- Bernoulli trials
- Bernstein, Sergei Natanovich
- Bernstein-Baskakov-Kantorovich operator
- Bernstein-Bezier form
- Bernstein-Bézier form
- Bernstein-Rogosinski summation method
- Bernstein-von Mises theorem
- Bernstein algebra
- Bernstein inequality
- Bernstein interpolation method
- Bernstein method
- Bernstein polynomials
- Bernstein problem
- Bernstein problem in differential geometry
- Bernstein problem in mathematical genetics
- Bernstein theorem
- Bernstein–Baskakov–Kantorovich operator
- Bernstein–Bézier form
- Bernstein–Rogosinski summation method
- Bernstein–von Mises theorem
- Berry-Esseen inequality
- Berry–Esseen inequality
- Bers space
- Bertini theorems
- Bertrand, Joseph
- Bertrand criterion
- Bertrand curves
- Bertrand paradox
- Bertrand postulate
- Berwald connection
- Berwald space
- Besicovitch-Federer projection theorem
- Besicovitch almost-periodic functions
- Besicovitch theorem
- Bessel equation
- Bessel function of the second kind
- Bessel function of the second type
- Bessel function of the third kind
- Bessel functions
- Bessel inequality
- Bessel interpolation formula
- Bessel polynomials
- Bessel potential
- Bessel potential operator
- Bessel potential space
- Bessel processes
- Bessel system
- Best approximation
- Best approximation in the mean
- Best approximations, sequence of
- Best complete approximation
- Best linear method
- Best linear unbiased estimation in linear models
- Best linear unbiased estimator
- Best quadrature formula
- Beta-distribution
- Beta-function
- Beth definability theorem
- Bethe-Sommerfeld conjecture
- Bethe–Sommerfeld conjecture
- Betti group
- Betti number
- Betti reciprocal theorem
- Beurling-Lax theorem
- Beurling algebra
- Beurling theorem
- Beurling–Lax theorem
- Bezier curve
- Bezier spline
- Bezier surface
- Bezout domain
- Bezout ring
- Bezout theorem
- Bhatnagar-Gross-Krook model
- Bhatnagar–Gross–Krook model
- Bhattacharyya distance
- Bi-ideal sequence
- Bianchi congruence
- Bianchi group
- Bianchi identity
- Bianchi surface
- Bianchi transformation
- Biased estimator
- Bicategory
- Bicategory(2)
- Bicharacteristic
- Bicomplex
- Biconnected space
- Bicyclic semi-group
- Bicylinder
- Bicylindrical coordinates
- Bicylindrical domain
- Bicylindrics
- Bieberbach-Eilenberg functions
- Bieberbach conjecture
- Bieberbach polynomials
- Bieberbach–Eilenberg functions
- Bienaymé, Irenée-Jules
- Bifactorial mapping
- Bifunctor
- Bifurcation
- Biharmonic function
- Biholomorphic mapping
- Bijection
- Bilinear differential
- Bilinear form
- Bilinear functional
- Bilinear integral form
- Bilinear mapping
- Billard method
- Bimatrix game
- Bimodal distribution
- Bimodule
- Bimorphism
- Binary Lie algebra
- Binary computing system
- Binary form
- Binary icosahedral group
- Binary logistic regression
- Binary octahedral group
- Binary operation
- Binary p-adic-group
- Binary quadratic form
- Binary relation
- Binary tetrahedral group
- Binary tree
- Binary unit
- Binate group
- Bingham fluid
- Binomial
- Binomial coefficients
- Binomial distribution
- Binomial ring
- Binomial series
- Binormal
- Biorthogonal system
- Bipartite graph
- Biplanar space
- Bipolar coordinates
- Biquadratic equation
- Birational geometry
- Birational mapping
- Birational morphism
- Birational transformation
- Birch-Tate conjecture
- Birch–Tate conjecture
- Birkhoff-Rott equation
- Birkhoff-Witt theorem
- Birkhoff ergodic theorem
- Birkhoff factorization
- Birkhoff normal form
- Birkhoff stratification
- Birkhoff theorem
- Birkhoff–Rott equation
- Birkhoff–Witt theorem
- Birth-and-death process
- Bisector plane
- Bisectrix
- Bishop-Phelps theorem
- Bishop theorem
- Bishop–Phelps theorem
- Bispectrality
- Bit
- Bitsadze-Lavrent'ev problem
- Bitsadze-Samarskii problem
- Bitsadze equation
- Bitsadze–Lavrent'ev problem
- Bitsadze–Samarskii problem
- Bivector
- Bivector space
- Bjorling problem
- Björling problem
- Black-Scholes formula
- Blackwell renewal theorem
- Black–Scholes formula
- Blaschke-Santalo inequality
- Blaschke-Santaló inequality
- Blaschke-Weyl formula
- Blaschke factor
- Blaschke product
- Blaschke selection theorem
- Blaschke–Santaló inequality
- Blaschke–Weyl formula
- Bliedtner-Hansen lemma
- Bliedtner–Hansen lemma
- Bloch constant
- Bloch function
- Bloch wave
- Block
- Block-diagonal operator
- Block design
- Blomqvist coefficient
- Blotto games
- Blow-up algebra
- Blumberg theorem
- Bochner-Martinelli representation formula
- Bochner-Riesz means
- Bochner almost-periodic functions
- Bochner curvature tensor
- Bochner integral
- Bochner–Martinelli representation formula
- Bochner–Riesz means
- Bodenmiller theorem
- Bogolyubov chain of equations
- Bogolyubov inequality