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    MATHEMATICS

       abacus
       ABC conjecture
       Abelian group
       abracadabra
       abscissa
       absolute
       absolute value
       abstract algebra
       abundant number
       Ackermann function
       acre
       acute
       adjacent
       affine geometry
       age puzzles and tricks
       aleph
       Alexander's horned sphere
       algebra
       algebraic curve
       algebraic function
       algebraic geometry
       algebraic number
       algebraic number theory
       algebraic topology
       algorithm
       algorithmic complexity
       Alhambra
       aliquot part
       Allais paradox
       almost perfect number
       alphamagic square
       alphametic
       Altekruse puzzle
       alternate
       altitude
       ambiguous figure
       Ames room
       amicable numbers
       anagram
       anallagmatic curve
       analysis
       analytical geometry
       analytical number theory
       anamorphosis
       angle
       animals' mathematical ability
       annulus
       antigravity houses and hills
       antimagic square
       antiprism
       aperiodic tiling
       Apéry's constant
       apex
       Apollonius problem
       apothem
       apotome
       applied mathematics
       Arabic numerals
       arbelos
       arc
       arch
       Archimedean solid
       Archimedean spiral
       Archimedean tessellation
       Archimedes' cattle problem
       area
       area codes
       Argand diagram
       argument
       Arisitotle's wheel
       arithmetic
       arithmetic mean
       arithmetic sequence
       array
       Arrow paradox
       astroid
       asymptote
       attractor
       Aubel's theorem
       automorphic number
       automorphism
       average
       Avogadro constant
       axiom
       axiom of choice
       axis

       backgammon
       Bakhshali Manuscript
       ball
       Banach-Tarski paradox
       Bang's theorem
       banker's rounding
       Barnsley's fern
       base
       basin of attraction
       Bayesian inference
       Bayes' theorem
       Beal ciphers
       Beast Number
       Beatty sequences
       beauty and mathematics
       bell curve
       Bell number
       Benford's law
       Bernoulli number
       Berry's paradox
       Bertrand's box paradox
       Bertrand's postulate
       beta function
       Betti number
       bicorn
       bicuspid curve
       Bieberbach conjecture
       bifurcation
       bilateral diagram
       bimagic square
       binary
       binary operation
       binomial
       binomial coefficient
       binomial theorem
       birthday paradox
       bisect
       bisecting an angle
       bishop's problem
       bistromathics
       blackjack
       Blanche's dissection
       Boolean
       Boolean algebra
       Borromean rings
       Borsuk-Ulam theorem
       boundary condition
       boundary value problem
       brachistochrone problem
       braid
       Brianchon's theorem
       Bridges of Königsberg
       Brochard problem
       Brouwer fixed-point theorem
       bubbles
       Buffon's needle
       bundle
       Burali-Forti paradox
       Buridan's ass
       burr puzzle
       butterfly theorem
       byte

       caduceus
       Caesar cipher
       cake-cutting
       Calabi-Yau space
       calculus
       calculus of variations
       calendar curiosities
       Caliban puzzle
       cannonball problem
       canonical form
       Cantor dust
       cap
       cardinal number
       cardioid
       cards
       Carmichael number
       Cartesian coordinates
       Cartesian oval
       Cassinian ovals
       casting out nines
       Catalan number
       Catalan solid
       Catalan's conjecture
       Catalan's constant
       catastrophe theory
       category theory
       catenary
       catenoid
       cathetus
       caustic curve
       Cavalieri's principle
       Cayley's mousetrap
       Cayley's sextic
       ceiling
       cellular automaton
       celt
       center of perspective
       central angle
       centroid
       century
       Chaitin's constant
       Champernowne's number
       change ringing
       chaos
       chaotic attractor
       character theory
       chess
       Chinese remainder theorem
       chord
       chronogram
       cipher
       circle
       circle involute
       circular cone
       circular prime
       circumcenter
       circumcircle
       circumference
       cissoid
       classification in mathematics
       clelia
       clock puzzles
       closed
       cochleoid
       codimension
       coding theory
       codomain
       coefficient
       cohomology
       coin paradox
       Collatz problem
       combination
       combinatorics
       commensurable
       common fraction
       commutative
       complement
       complete
       complete graph
       complex adaptive system
       complex analysis
       complex number
       complexity
       complexity theory
       composite number
       compound polyhedron
       computability theorem
       computable number
       conchoid
       cone
       conformal mapping
       congruent
       congruum problem
       conic sections
       conjecture
       conjugate
       connected
       connected graph
       connectionism
       connectivity
       consistency
       constructible
       continued fraction
       continuity
       continuum
       continuum hypothesis
       convergence
       convex
       Conway's chained-arrow notation
       coordinate
       coprime
       countable set
       counterfeir coin problem
       covariance
       cross
       crunode
       cryptarithm
       cryptography
       Császár polyhedron
       cube
       cubic curve
       cubic equation
       cubit
       cuboctahedron
       cuboid
       Cullen number
       Cunningham chain
       cup
       curvature
       curve
       curve of constant width
       cusp
       cute number
       cyclic number
       cyclic polygon
       cycloid
       cylinder

       Dandelin spheres
       dart
       de Malve's theorem
       de Méré's problem
       de Moivre's theorem
       decagon
       decimal
       decimal fraction
       degree
       degree of freedom
       delta curve
       deltahedron
       deltoid
       denominator
       derivative
       determinant
       Devil's curve
       diagonal matrix
       diameter
       dice
       difference equation
       differential
       differential equation
       differential geometry
       differential topology
       digimetic
       digital root
       digraph
       dihedral angle
       dimension
       Diophantine approximation
       Diophantine equation
       Diophantus's riddle
       direct proportion
       directed graph
       directrix
       Dirichlet's theorem
       discontinuity
       discrete
       discriminant
       disk (mathematics)
       disme
       dissection
       distortion illusion
       distributive
       diverge
       division
       dodecagon
       dodecahedron
       domain
       domino
       domino problem
       dual
       Dupin cyclide
       duplicating the cube
       Dürer's shell curve
       dynamical system

       e
       Earthshapes
       economical number
       edge
       edge of chaos
       egg
       Egyptian fraction
       eigenvalue
       eight
       eight curve
       Einstein problem
       elementary function
       eleven
       ellipse
       ellipsoid
       elliptic curve
       elliptic function
       elliptical geometry
       embedding
       emirp
       empty set
       enantiomorph
       enormous theorem
       epicycloid
       epitrochoid
       equichordal point
       equilibrium
       equivalent numbers
       ergodic
       escribed circle
       Eternity puzzle
       Euclidean geometry
       Euclidean space
       Euclid's postulates
       Euler characteristic
       Euler circuit
       Euler line
       Euler path
       Euler square
       Euler-Mascheroni constant
       Euler's conjecture
       Euler's formula
       Euler's formula for polyhedra
       even function
       evolute
       excluded middle law
       existence
       exponent
       exponential

       face
       factor
       factorial
       factorion
       Fagnano's problem
       Farey sequence
       Feigenbaum's constant
       Fermat number
       Fermat's last theorem
       Fermat's little theorem
       Fermat's spiral
       Fibonacci sequence
       field
       Fifteen puzzle
       figurate number
       films and plays involving mathematics
       finite
       finite-state automaton
       Fitchneal
       five
       fixed-point attractor
       Flatland
       flexagon
       floor function
       fly-between-trains problem
       focal chord
       focal radius
       focus
       foliation
       folium
       formal system
       formalism
       Fortune's conjecture
       four
       four coins problem
       four fours problem
       four knights puzzle
       four-color problem
       Fourier series
       fourth dimension
       Fox and Geese
       fractal
       fractal dimension
       fraction
       Fraser spiral
       Freemish crate
       Frogs and Toads
       frustrum
       function
       functional analysis
       fundamental group
       fundamental theorem of algebra
       fundamental theorem of arithmetic
       fuzzy logic

       Gabriel's horn
       Galois theory
       game
       game theory
       games and puzzles
       gamma function
       gauge theory
       Gaussian
       Gelfond's theorem
       genetic algorithm
       genus
       geoboard
       geodesic
       geometric mean
       geometric sequence
       geometry puzzles
       Gergonne point
       Get Off the Earth
       Gettier problem
       Gilbreath's conjecture
       glissette
       gnomon magic square
       Go
       Godel's incompleteness theorem
       Goldbach conjecture
       golden ratio
       golygon
       googol
       Gordian Knot
       graceful graph
       gradient
       Graham's number
       graph
       graph theory
       greatest common divisor
       greatest lower bound
       Green's theorem
       Grelling's paradox
       gross
       group

       Haberdasher's puzzle
       Hadwiger problem
       hailstone sequence
       hairy ball theorem
       halting problem
       ham sandwich theorem
       Hamilton circuit
       Hamilton path
       Hamiltonian
       Hankel matrix
       happy number
       harmonic analysis
       harmonic division
       harmonic function
       harmonic mean
       harmonic sequence
       Harshad number
       hat problem
       Hausdorff dimension
       Heesch number
       helicoid
       helix
       Hermann grid illusion
       Hero's formula
       Herring illusion
       heuristic argument
       Hex
       hexa-
       hexadecimal
       hexagon
       hexahedron
       higher dimensions
       Hilbert space
       hippopede
       Hnefa-Tafl
       hole (topology)
       hole-in-a-postcard problem
       hole-through-a-sphere problem
       hole-through-the-Earth problem
       homeomorphic
       homeomorphism
       homology
       homomorphism
       homotopy
       hundred
       hundred fowls problem
       hyperbola
       hyperbolic geometry
       hyperbolic spiral
       hyperboloid
       hypercube
       hyperfactorial
       hypergeometric function
       hyperreal number
       hypocycloid
       hypotenuse
       hypothesis
       hypotrochoid

       i (imaginary unit number)
       icosahedron
       icosian game
       idempotent
       identity
       imaginary number
       impossible figure
       impossible trident
       impossibilities in mathematics
       incomputable number
       induction
       inequality
       infinite dimensions
       infinite series
       infinitesimal
       infinity
       inflection
       information theory
       injection
       inscribed angle
       inscribed circle
       integer
       integral
       integral equation
       integration
       interesting numbers
       interpolate
       intersection
       invariant
       invariant theory
       inverse
       irradiation illusion
       irrational number
       isochrone
       isogonal conjugate
       isometry
       isomorphism
       isosceles
       isotomic conjugate
       isovolume problem
       iterate
       iteration

       Johnson solid
       Johnson's theorem
       Jordan curve
       Jordan matrix
       Julia set
       jump discontinuity

       Kakeya needle problem
       Kaluza-Klein theory
       kampyle of Eudoxus
       kappa curve
       Kaprekar constant
       Kaprekar number
       Kepler-Poinsot solids
       Khintchine's constant
       kings problem
       kinship puzzles
       kite
       Klein bottle
       knights tour
       knot
       Knuth's up-arrow notation
       Koch snowflake

       lambda calculus
       Lamé curve
       lamination
       Langley's adventitious angles
       Langton's Ant
       Laplace's equation
       large numbers
       Latin square
       lattice
       lattice path
       lattice point
       lattice theory
       latus rectum
       league
       least common multiple
       least upper bound
       Lebombo bone
       Leibniz harmonic triangle
       lemma
       lemniscate of Bernoulli
       Liar paradox
       Lie algebra
       Lie group
       Life game
       limaçon of Pascal
       limit
       limping triangle
       line
       linear
       linear algebra
       linear group
       linear programming
       linear system
       Liouville number
       Lissajous figure
       Lissajous orbit
       lituus
       localized solution
       loculus of Archimedes
       locus
       logarithm
       logarithmic spiral
       logic
       logical depth
       loop
       Lorenz system
       loxodrome
       lozenge
       L-system
       Lucas sequence
       lucky number
       Ludolph's number
       lune
       Lyapunov fractal

       Maclaurin trisectrix
       MacMahon squares
       magic cube
       magic square
       magic tour
       main diagonal
       major axis
       Malfatti circles
       mancala
       Mandelbrot set
       manifold
       Markov chain
       Martingale system
       Mascheroni construction
       mathematical lifespan
       mathematics
       matrix
       maze
       mean
       measure
       measure theory
       measuring and weghing puzzles
       mechanical puzzle
       medial triangle
       median
       Menger sponge
       Mersenne number
       Mersenne prime
       method of exhaustion
       metric
       metric space
       metrizable
       midpoint
       mile
       million
       minimal prime
       minimal surface
       mirror reversal problem
       missing dollar problem
       mixed strategy
       Mobius band
       mode
       model of computation
       model theory
       modulo
       Moiré pattern
       monkeys and typewriters
       monochromatic triangle
       monomial
       monotonic
       Monster group
       Monstrous Moonshine conjecture
       Monte Carlo method
       Monty Hall problem
       Morley's miracle
       moving sofa problem
       Mrs. Perkins' quilt
       Müller-Lyer illusion
       multigrade
       multiple
       multiplication
       myriad

       Nagel point
       narcissistic number
       Nash equilibrium
       natural number
       Necker cube
       negative number
       Neile's parabola
       nephroid
       net
       Neusis construction
       Newcomb's paradox
       Newton's method
       Nim
       nine
       Nine Men's Morris
       nine rooms paradox
       nine-point circle
       Niven number
       non-Abelian
       nonagon
       nonconvex uniform polyhedron
       non-Euclidean geometry
       nonstandard analysis
       normal
       normal number
       nothing
       nucleation
       null hypothesis
       number
       number line
       number system
       number theory
       numeral
       numerator
       numerical analysis

       obelus
       oblate spheroid
       oblique
       oblong
       oblong number
       obtuse
       octa-
       octagon
       octahedron
       octant
       octonion
       odd
       one-to-one
       one
       open
       operator
       optical illusion
       Orbison's illusion
       ordered pair
       ordinal number
       ordinary differential equation
       ordinate
       origami
       origin
       orthic triangle
       orthocenter
       orthogonal
       osculating
       oval
       Ovid's game

       packing
       palindrome
       palindromic number
       pandiagonal magic square
       pandigital number
       pangram
       parabola
       paraboloid
       paradox
       parallel postulate
       parallelepiped
       parallelogram
       parameter
       parity
       Parrondo's paradox
       partial derivative
       partial differential equation
       partition number
       Pascal's mystic hexagon
       Pascal's triangle
       pathological curve
       payoff
       Peano curve
       Pearls of Sluze
       pedal curve
       pedal triangle
       peg solitaire
       Pell equation
       Pell numbers
       Penrose stairway
       Penrose tiling
       Penrose triangle
       penta-
       pentomino
       perfect cube
       perfect number
       perfect power
       perfect square
       perimeter
       period, of a decimal expansion
       periodic
       periodic attractor
       periodic tiling
       permutable prime
       permutation
       perpendicular
       Perrin sequence
       phase space
       Phutball
       pi
       Pick's theorem
       place-value system
       plane
       plane partition
       plastic number
       Plateau curves
       Plateau's problem
       Platonic solid
       Platonism
       pleated surface
       Poggendorff illusion
       Poincaré conjecture
       Poincaré disk
       point-set topology
       Pólya's conjecture
       polycube
       polygon
       polygonal number
       polyhedron
       polyiamond
       polynomial
       polyomino
       polytope
       Poncelet's theorem
       Pony Puzzle
       postage stamp problems
       potential theory
       power
       power law
       power series
       power tower
       powerful number
       practical number
       prime number
       primitive root
       primitive root of unity
       primorial
       Prince Rupert's problem
       prism
       prisoner's dilemma
       probability
       probability theory
       projective geometry
       projective plane
       prolate spheroid
       pronic number
       proof
       proportional
       pseudoprime
       pure mathematics
       pursuit curve
       puzzle jug
       puzzle rings
       pyramid
       pyramidal number
       Pythagoras's theorem
       Pythagorean triangle
       Pythagorean triplet

       quadrangle
       quadrant
       quadratic
       quadratrix of Hippias
       quadrature
       quadric
       quadrilateral
       quartic
       quartile
       quasiperiodic
       quasi-regular polyhedron
       queens problem
       quine
       quintic
       quotient

       radian
       radical
       radical axis
       radius
       Ramsey theory
       random
       random number
       random walk
       range
       ranunculoid
       ratio
       rational number
       raven paradox
       real analysis
       real number
       realm
       reciprocal
       rectangle
       recursion
       recursive function
       recursively enumerable set
       reductio ad absurdum
       redundancy
       reflex angle
       reflexible
       regular expression
       regular polygon
       regular polyhedron
       relatively prime
       renormalization
       repdigit
       representation theory
       rep-tile
       rep-unit
       resultant
       Reuleaux polytope
       Reuleaux triangle
       Rhind papyrus
       rhombus
       Riemann hypothesis
       Riemann integral
       Riemann sphere
       Riemann surface
       Riemann zeta function
       right
       ring
       Rithmomachia
       river-crossing problems
       Roman numerals
       rooks problem
       root
       root of unity
       rope-around-the-Earth puzzle
       rose curve
       rotor
       roulette
       round
       round-off error
       Rubik's cube
       ruled surface
       Russell"s paradox
       Russian multiplication

       saddle
       St. Ives problem
       St. Petersburg paradox
       salinon
       scalar
       scalene triangle
       Schläfli symbol
       schoolgirls problem
       Schröder's reversible staircase
       score
       search space
       secant
       self-enumerating sentence
       self-intersecting
       self-referential sentence
       self-similarity
       semigroup
       semi-magic square
       semi-regular polyhedron
       sensitivity
       sequence
       series
       serpentine
       set
       set theory
       seven
       seventeen
       sexagesimal
       shuffle
       shunting puzzles
       Siegel's paradox
       Sierpinski carpet
       Sierpinski gasket
       Sierpinski number
       sieve of Eratosthenes
       significant digits
       similar
       simple group
       simplex
       simply-connected
       six
       six circles theorem
       skeletal division
       Skewes' number
       slide rule
       slope
       Slothouber-Graatsma puzzle
       Smith number
       smooth
       snowball prime
       Soddy circle
       Soddy's formula
       solidus
       solution
       Soma cube
       Sophie Germain prime
       space-filling curve
       special function
       Sperner's lemma
       sphere
       sphere packing
       sphericon
       spheroid
       Sphinx riddle
       spider-and-fly problem
       spinor
       spiral
       Sprague-Grundy theory
       Sprouts
       square
       square free
       square number
       square root of 2
       squaring the circle
       squaring the square
       standard deviation
       star of Lakshmi
       statistics
       Steiner-Lehmus theorem
       stellation
       strange loop
       strategy
       string puzzle
       strobogrammatic prime
       strophoid
       subgroup
       sublime number
       subspace
       substitution cipher
       Sultan's Dowry
       superegg
       superellipse
       superfactorial
       supplementary angles
       surface
       surreal number
       swastika
       syllogism
       Sylvester's problem of collinear points
       symmedian
       symmetric group
       symmetry
       symmetry group
       Szilassi polyhedron

       TacTix
       Tafl game
       Tait's conjecture
       tally
       tangent
       tangle
       tangled graph
       Tangloids
       Tangrams
       tautochrone problem
       tautology
       ten
       tensor
       tesseract
       tetrahedral number
       tetrahedron
       Tetris
       tetromino
       theorem
       Thiery figure
       thirteen
       Thirty Colored Cubes puzzle
       Thirty-six officers problem
       thousand
       three
       Three Men's Morris
       Thue-Morse constant
       tic-tac-toe
       tie knot
       tiling
       time complexity
       time-reversible
       Tinner's Rabbits
       Tippee Top
       Titchener illusion
       Toeplitz matrix
       topological dimension
       topological group
       topological space
       topology
       torus
       tour
       Tower of Brahma
       Tower of Hanoi
       T-puzzle
       trace
       tractrix
       transcendental number
       transfinite number
       transformation
       transpose
       transposition cipher
       transversal
       trapezium
       trapezoid
       traveling salesman problem
       tree
       trefoil curve
       triangle
       triangular number
       Trick Donkeys puzzle
       trident of Newton
       trigonometric function
       trigonometry
       trillion
       trinomial
       triomino
       trisecting an angle
       trisectrix
       trochoid
       truel
       truncatable prime
       truncate
       Tschirnaus's cubic
       Turing machine
       Turing test
       twelve
       twenty
       twin primes
       twisted cubic
       two
       two-dimensional worlds

       Ulam spiral
       uncountable set
       undulating number
       unduloid
       unexpected hanging
       uniform polyhedron
       unilluminable room problem
       unimodal sequence
       unimodular matrix
       union
       unique number
       unit circle
       unit cube
       unit fraction
       universal approximation
       universal computation
       universal computer
       Universal Library
       universe of discourse
       untouchable number
       utility function

       vampire number
       vanishment puzzle
       vector
       vector space
       Venn diagram
       vertex
       vertex figure
       vertical-horizontal illusion
       vesica piscis
       Vickrey auction
       vigesimal
       vinculum
       Viviani's curve
       Viviani's theorem
       volume
       von Neumann machine
       Voronoi diagram

       walking in the rain problem
       wallpaper group
       Waring's conjecture
       weak inequality
       Weierstrass' nondifferentiable function
       weighted graph
       wff
       What color was the bear?
       wheat and chessboard problem
       Whitney's umbrella
       Wilson's theorem
       winding number
       Wundt illusion
       Wythoff's game

       x
       x-axis
       X-pentomino

       y-axis

       Zeller's formula
       Zeno's paradoxes
       zero
       zero divisors
       zero-sum game
       zeta function
       Zöllner illusion
       zombie
       zone
       zonohedron



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    Encyclopedia of History
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