Timeline of mathematics

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A timeline of pure and applied mathematics

Before 1000 BC

• ca. 70,000 BC - South Africa, ochre rocks adorned with scratched geometric patterns [1]
• ca. 35,000 BC to 20,000 BC - Africa & France, earliest known prehistoric attempts to quantify time (references: [2], [3], [4])
• ca. 20,000 BC - Nile Valley, Ishango Bone: earliest known prime number sequences and also Egyptian multiplication
• ca. 3400 BC - Mesopotamia, the Sumerians invent the first numeral system, and a system of weights and measures
• ca. 3100 BC - Egypt, earliest known decimal system allows indefinite counting by way of introducing new symbols, [5]
• ca. 2800 BC - Indus Valley Civilization on the Indian subcontinent, earliest use of decimal ratios in a uniform system of ancient weights and measures, the smallest unit of measurement used is 1.704 millimetres and the smallest unit of mass used is 28 grams.
• 2800 BC - The Lo Shu Square, the unique normal magic square of order three, was discovered in China.
• 2700 BC - Egypt, precision surveying
• 2600 BC - Indus Valley Civilization - objects, streets, pavements, houses, and multi-storied buildings are constructed at perfect right-angles, with each brick having exactly the same dimensions
• 2400 BC - Mesopotamia, the Babylonians invent the earliest calculator, the Abacus
• 2400 BC - Egypt, precise Astronomical Calendar, used even in the Middle Ages for its mathematical regularity
• ca. 2000 BC - Mesopotamia, the Babylonians use a base-60 decimal system, and compute the first known approximate value of π at 3.125
• 1800 BC - Moscow Mathematical Papyrus, generalized formula for finding volume of frustums, [6]
• 1800 BC - Berlin papyrus, shows that the ancient Egyptians knew how to solve 2nd order algebraic equations: [7].
• ca. 1800 BC - Vedic India - Yajnavalkya writes the Shatapatha Brahmana, in which he describes the motions of the sun and the moon, and advances a 95-year cycle to synchronize the motions of the sun and the moon
• ca. 1800 BC - the Yajur Veda, one of the four Hindu Vedas, contains the earliest concept of infinity, and states that "if you remove a part from infinity or add a part to infinity, still what remains is infinity"
• 1650 BC - Rhind Mathematical Papyrus, copy of a lost scroll from around 1850 BC, the scribe Ahmes presents one of the first known approximate values of π at 3.16, the first attempt at squaring the circle, earliest known use of a sort of cotangent, and knowledge of solving first order linear equations
• 1350 BC - Indian astronomer Lagadha writes the "Vedanga Jyotisha", a Vedic text on astronomy that describes rules for tracking the motions of the sun and the moon, and uses geometry and trigonometry for astronomy

1st millennium BC

• ca 1000 BC - Vulgar fractions used by the Egyptians.
• 800 BC - Baudhayana, author of the Baudhayana Sulba Sutra, a Vedic Sanskrit geometric text, contains the first use of the Pythagorean theorem, quadratic equations, and calculates the square root of 2 correct to five decimal places
• 600 BC - Apastamba, author of the Apastamba Sulba Sutra, another Vedic Sanskrit geometric text, makes an attempt at squaring the circle and also calculates the square root of 2 correct to five decimal places
• ca. 600 BC - the other Vedic "Sulba Sutras" ("rule of chords" in Sanskrit) use Pythagorean triples, contain of a number of geometrical proofs, and approximate π at 3.16
• 530 BC - Pythagoras studies propositional geometry and vibrating lyre strings; his group also discover the irrationality of the square root of two,
• ca. 500 BC - Indian grammarian Pānini, considered the father of computing machines, writes the Astadhyayi, which contains the use of metarules, transformations and recursions, originally for the purpose of systematising the grammar of Sanskrit
• ca. 400 BC - Jaina mathematicians in India write the "Surya Prajinapti", a mathematical text which classifies all numbers into three sets: enumerable, innumerable and infinite. It also recognises five different types of infinity: infinite in one and two directions, infinite in area, infinite everywhere, and infinite perpetually.
• 300s BC - Indian texts use the Sanskrit word "Shunya" to refer to the concept of 'void' (zero)
• 370 BC - Eudoxus states the method of exhaustion for area determination,
• 350 BC - Aristotle discusses logical reasoning in Organon,
• 300 BC - Jaina mathematicians in India write the "Bhagabati Sutra", which contains the earliest information on combinations
• 300 BC - Euclid in his Elements studies geometry as an axiomatic system, proves the infinitude of prime numbers and presents the Euclidean algorithm; he states the law of reflection in Catoptrics, and he proves the fundamental theorem of arithmetic
• ca. 300 BC - Brahmi numerals, is conceived in India
• ca. 300 BC - Indian mathematician Pingala writes the "Chhandah-shastra", which contains the first Indian use of zero as a digit (indicated by a dot) and also presents a description of a binary numeral system, along with the first use of Fibonacci numbers and Pascal's triangle
• 260 BC - Archimedes computes π to two decimal places using inscribed and circumscribed polygons and computes the area under a parabolic segment,
• ca. 250 BC - late Olmecs had already begun to use a true zero (a shell glyph) several centuries before Ptolemy in the New World. See 0 (number).
• 240 BC - Eratosthenes uses his sieve algorithm to quickly isolate prime numbers,
• 225 BC - Apollonius of Perga writes On Conic Sections and names the ellipse, parabola, and hyperbola,
• 150 BC - Jain mathematicians in India write the "Sthananga Sutra", which contains work on the theory of numbers, arithmetical operations, geometry, operations with fractions, simple equations, cubic equations, quartic equations, and permutations and combinations
• 140 BC - Hipparchus develops the bases of trigonometry,
• 50 BC - Indian numerals, the first positional notation base-10 numeral system, begins developing in India

1st millennium

• 1st century - Heron of Alexandria, the earliest fleeting reference to square roots of negative numbers.
• ca. 200s - Ptolemy of Alexandria wrote the Almagest,
• 250 - Diophantus uses symbols for unknown numbers in terms of the syncopated algebra, and he writes Arithmetica, the first systematic treatise on algebra,
• 300 - the earliest known use of zero as a decimal digit is introduced by Indian mathematicians
• 400 - the "Bakhshali manuscript" is written by Jaina mathematicians, which describes a theory of the infinite containing different levels of infinity, shows an understanding of indices, as well as logarithms to base 2, and computes square roots of numbers as large as a million correct to at least 11 decimal places
• 450 - Zu Chongzhi computes π to seven decimal places,
• 500 - Aryabhata writes the "Aryabhata-Siddhanta", which first introduces the trigonometric functions and methods of calculating their approximate numerical values. It defines the concepts of sine and cosine, and also contains the earliest tables of sine and cosine values (in 3.75-degree intervals from 0 to 90 degrees)
• 500s - Aryabhata gives accurate calculations for astronomical constants, such as the solar eclipse and lunar eclipse, computes π to four decimal places, and obtains whole number solutions to linear equations by a method equivalent to the modern method
• 550 - Hindu mathematicians give zero a numeral representation in the positional notation Indian numeral system
• 600s - Bhaskara I gives a rational approximation of the sine function
• 600s - Brahmagupta invents the method of solving indeterminate equations of the second degree and is the first to use algebra to solve astronomical problems. He also develops methods for calculations of the motions and places of various planets, their rising and setting, conjunctions, and the calculation of eclipses of the sun and the moon
• 628 - Brahmagupta writes the Brahma-sphuta-siddhanta, where zero is clearly explained, and where the modern place-value Indian numeral system is fully developed. It also gives rules for manipulating both negative and positive numbers, methods for computing square roots, methods of solving linear and quadratic equations, and rules for summing series, Brahmagupta's identity, and the Brahmagupta theorem
• 700s - Virasena gives explicit rules for the Fibonacci sequence, gives the derivation of the volume of a frustum using an infinite procedure, and also deals with the logarithm to base 2 and knows its laws
• 700s - Shridhara gives the rule for finding the volume of a sphere and also the formula for solving quadratic equations
• 750 - Al-Khawarizmi - Considered father of modern algebra since he was the first to bring Indian mathematics to Europe. First mathematician to work on the details of 'Arithmetic and Algebra of inheritance' besides the systematisation of the theory of linear and quadratic equations.
• 773 - Kanka brings Brahmagupta's Brahma-sphuta-siddhanta to Baghdad to explain the Indian system of arithmetic astronomy and the Indian numeral system
• 773 - Al Fazaii translates the Brahma-sphuta-siddhanta into Arabic upon the request of King Khalif Abbasid Al Mansoor
• 800s - Govindsvamin discovers the Newton-Gauss interpolation formula, and gives the fractional parts of Aryabhata's tabular sines
• 895 - Thabit ibn Qurra - The only surviving fragment of his original work contains a chapter on the solution and properties of cubic equations.
• 953 - Al-Uqlidisi writes the earliest translation on the Indian place-value numeral system
• 975 - Al-Batani - Extended the Indian concepts of sine and cosine to other trigonometrical ratios, like tan­gent, secant and their inverse functions. Derived the formula: sin α = tan α / (1+tan² α) and cos α = 1 / (1 + tan² α).

1000 - 1499

• 1020 - Abul Wáfa - Gave this famous formula: sin (α + β) = sin α cos β + sin β cos α. Also discussed the quadrature of the parabola and the volume of the paraboloid.
• 1030 - Ali Ahmad Nasawi - Divides hours into 60 minutes and minutes into 60 seconds.
• 1070 - Omar Khayyám begins to write Treatise on Demonstration of Problems of Algebra and classifies cubic equations.
• 1100s - Indian numerals have been modified by Arab mathematicians to form the modern Hindu-Arabic numeral system (used universally in the modern world)
• 1100s - the Hindu-Arabic numeral system reaches Europe through the Arabs
• 1100s - Bhaskara Acharya writes the Lilavati, which covers the topics of definitions, arithmetical terms, interest computation, arithmetical and geometrical progressions, plane geometry, solid geometry, the shadow of the gnomon, methods to solve indeterminate equations, and combinations
• 1100s - Bhaskara Acharya writes the "Bijaganita" ("Algebra"), which is the first text to recognize that a positive number has two square roots
• 1100s - Bhaskara Acharya conceives differential calculus, and also develops Rolle's theorem, Pell's equation, a proof for the Pythagorean Theorem, proves that division by zero is infinity, computes π to 5 decimal places, and calculates the time taken for the earth to orbit the sun to 9 decimal places
• 1202 - Leonardo Fibonacci demonstrates the utility of Hindu-Arabic_numerals in his Book of the Abacus,
• 1303 - Zhu Shijie publishes Precious Mirror of the Four Elements, which contains ancient method of arranging binomial coefficients in a triangle.
• 1300s - Madhava is considered the father of mathematical analysis, who also worked on the power series for p and for sine and cosine functions, and along with other Kerala school mathematicians, founded the important concepts of Calculus
• 1300s - Parameshvara, a Kerala school mathematician, presents a series form of the sine function that is equivalent to its Taylor series expansion, states the mean value theorem of differential calculus, and is also the first mathematician to give the radius of circle with inscribed cyclic quadrilateral
• 1400 - Madhava discovers the series expansion for the inverse-tangent function, the infinite series for arctan and sin, and many methods for calculating the circumference of the circle, and uses them to compute π correct to 11 decimal places
• 1424 - Ghiyath al-Kashi - computes π to sixteen decimal places using inscribed and circumscribed polygons,
• 1400s - Nilakantha Somayaji, a Kerala school mathematician, writes the "Aryabhatiya Bhasya", which contains work on infinite-series expansions, problems of algebra, and spherical geometry

16th century

• 1501 - Nilakantha Somayaji writes the "Tantra Samgraha", which lays the foundation for a complete system of fluxions (derivatives), and expands on concepts from his previous text, the "Aryabhatiya Bhasya"
• 1520 - Scipione dal Ferro develops a method for solving "depressed" cubic equations (cubic equations without an x² term), but does not publish,
• 1535 - Niccolo Tartaglia independently develops a method for solving depressed cubic equations but also does not publish,
• 1539 - Gerolamo Cardano learns Tartaglia's method for solving depressed cubics and discovers a method for depressing cubics, thereby creating a method for solving all cubics,
• 1540 - Lodovico Ferrari solves the quartic equation,
• 1544 - Michael Stifel publishes "Arithmetica integra",
• 1550 - Jyeshtadeva, a Kerala school mathematician, writes the "Yuktibhasa", the world's first calculus text, which gives detailed derivations of many calculus theorems and formulae
• 1500s - Jesuit missionaries in India translate many astronomical and mathematical Indian texts and transmit them to Europe
• 1596 - Ludolf van Ceulen computes π to twenty decimal places using inscribed and circumscribed polygons,

17th century

• 1600s - Putumana Somayaji writes the "Paddhati", which presents a detailed discussion of various trigonometric series
• 1614 - John Napier discusses Napierian logarithms in Mirifici Logarithmorum Canonis Descriptio,
• 1617 - Henry Briggs discusses decimal logarithms in Logarithmorum Chilias Prima,
• 1618 - John Napier publishes the first references to e in a work on logarithms.
• 1619 - René Descartes discovers analytic geometry (Pierre de Fermat claimed that he also discovered it independently),
• 1619 - Johannes Kepler discovers two of the Kepler-Poinsot solids.
• 1629 - Pierre de Fermat develops a rudimentary differential calculus,
• 1634 - Gilles de Roberval shows that the area under a cycloid is three times the area of its generating circle,
• 1637 - Pierre de Fermat claims to have proven Fermat's last theorem in his copy of Diophantus' Arithmetica,
• 1637 - First use of the term imaginary number by René Descartes, it was meant to be derogatory.
• 1654 - Blaise Pascal and Pierre de Fermat create the theory of probability,
• 1655 - John Wallis writes Arithmetica Infinitorum,
• 1658 - Christopher Wren shows that the length of a cycloid is four times the diameter of its generating circle,
• 1665 - Isaac Newton works on the fundamental theorem of calculus and develops his version of infinitesimal calculus,
• 1668 - Nicholas Mercator and William Brouncker discover an infinite series for the logarithm while attempting to calculate the area under a hyperbolic segment,
• 1671 - James Gregory develops a series expansion for the inverse-tangent function (originally discovered by Madhava)
• 1673 - Gottfried Leibniz also develops his version of infinitesimal calculus,
• 1675 - Isaac Newton invents an algorithm for the computation of functional roots,
• 1691 - Gottfried Leibniz discovers the technique of separation of variables for ordinary differential equations,
• 1693 - Edmund Halley prepares the first mortality tables statistically relating death rate to age,
• 1696 - Guillaume de L'Hôpital states his rule for the computation of certain limits,
• 1696 - Jakob Bernoulli and Johann Bernoulli solve brachistochrone problem, the first result in the calculus of variations,

18th century

• 1706 - John Machin develops a quickly converging inverse-tangent series for π and computes π to 100 decimal places,
• 1712 - Brook Taylor develops Taylor series,
• 1722 - Abraham De Moivre states De Moivre's theorem connecting trigonometric functions and complex numbers,
• 1724 - Abraham De Moivre studies mortality statistics and the foundation of the theory of annuities in Annuities on Lives,
• 1730 - James Stirling publishes The Differential Method,
• 1733 - Giovanni Gerolamo Saccheri studies what geometry would be like if Euclid's fifth postulate were false,
• 1733 - Abraham de Moivre introduces the normal distribution to approximate the binomial distribution in probability,
• 1734 - Leonhard Euler introduces the integrating factor technique for solving first-order ordinary differential equations,
• 1736 - Leonhard Euler solves the problem of the Seven bridges of Königsberg, in effect creating graph theory,
• 1739 - Leonhard Euler solves the general homogeneous linear ordinary differential equation with constant coefficients,
• 1742 - Christian Goldbach conjectures that every even number greater than two can be expressed as the sum of two primes, now known as Goldbach's conjecture,
• 1748 - Maria Gaetana Agnesi discusses analysis in Instituzioni Analitiche ad Uso della Gioventu Italiana,
• 1761 - Thomas Bayes proves Bayes' theorem,
• 1762 - Joseph Louis Lagrange discovers the divergence theorem,
• 1789 - Jurij Vega improves Machin's formula and computes π to 140 decimal places,
• 1794 - Jurij Vega publishes Thesaurus Logarithmorum Completus,
• 1796 - Carl Friedrich Gauss proves that the regular 17-gon can be constructed using only a compass and straightedge
• 1796 - Adrien-Marie Legendre conjectures the prime number theorem,
• 1797 - Caspar Wessel associates vectors with complex numbers and studies complex number operations in geometrical terms,
• 1799 - Carl Friedrich Gauss proves the fundamental theorem of algebra (every polynomial equation has a solution among the complex numbers),
• 1799 - Paolo Ruffini partially proves the Abel–Ruffini theorem that quintic or higher equations cannot be solved by a general formula,

19th century

• 1801 - Disquisitiones Arithmeticae, Carl Friedrich Gauss's number theory treatise, is published in Latin
• 1805 - Adrien-Marie Legendre introduces the method of least squares for fitting a curve to a given set of observations,
• 1806 - Louis Poinsot discovers the two remaining Kepler-Poinsot solid.
• 1807 - Joseph Fourier announces his discoveries about the trigonometric decomposition of functions,
• 1811 - Carl Friedrich Gauss discusses the meaning of integrals with complex limits and briefly examines the dependence of such integrals on the chosen path of integration,
• 1815 - Siméon-Denis Poisson carries out integrations along paths in the complex plane,
• 1817 - Bernard Bolzano presents the intermediate value theorem---a continuous function which is negative at one point and positive at another point must be zero for at least one point in between,
• 1822 - Augustin-Louis Cauchy presents the Cauchy integral theorem for integration around the boundary of a rectangle in the complex plane,
• 1824 - Niels Henrik Abel partially proves the Abel–Ruffini theorem that the general quintic or higher equations cannot be solved by a general formula involving only arithmetical operations and roots,
• 1825 - Augustin-Louis Cauchy presents the Cauchy integral theorem for general integration paths -- he assumes the function being integrated has a continuous derivative, and he introduces the theory of residues in complex analysis,
• 1825 - Johann Peter Gustav Lejeune Dirichlet and Adrien-Marie Legendre prove Fermat's last theorem for n = 5,
• 1825 - André-Marie Ampère discovers Stokes' theorem,
• 1828 - George Green proves Green's theorem,
• 1829 - Nikolai Ivanovich Lobachevsky publishes his work on hyperbolic non-Euclidean geometry,
• 1831 - Mikhail Vasilievich Ostrogradsky rediscovers and gives the first proof of the divergence theorem earlier described by Lagrange, Gauss and Green,
• 1832 - Évariste Galois presents a general condition for the solvability of algebraic equations, thereby essentially founding group theory and Galois theory,
• 1832 - Peter Dirichlet proves Fermat's last theorem for n = 14,
• 1835 - Peter Dirichlet proves Dirichlet's theorem about prime numbers in arithmetical progressions,
• 1837 - Pierre Wantsel proves that doubling the cube and trisecting the angle are impossible with only a compass and straightedge, as well as the full completion of the problem of constructability of regular polygons
• 1841 - Karl Weierstrass discovers but does not publish the Laurent expansion theorem,
• 1843 - Pierre-Alphonse Laurent discovers and presents the Laurent expansion theorem,
• 1843 - William Hamilton discovers the calculus of quaternions and deduces that they are non-commutative,
• 1847 - George Boole formalizes symbolic logic in The Mathematical Analysis of Logic, defining what are now called Boolean algebras,
• 1849 - George Gabriel Stokes shows that solitary waves can arise from a combination of periodic waves,
• 1850 - Victor Alexandre Puiseux distinguishes between poles and branch points and introduces the concept of essential singular points,
• 1850 - George Gabriel Stokes rediscovers and proves Stokes' theorem,
• 1854 - Bernhard Riemann introduces Riemannian geometry,
• 1854 - Arthur Cayley shows that quaternions can be used to represent rotations in four-dimensional space,
• 1858 - August Ferdinand Möbius invents the Möbius strip,
• 1859 - Bernhard Riemann formulates the Riemann hypothesis which has strong implications about the distribution of prime numbers,
• 1870 - Felix Klein constructs an analytic geometry for Lobachevski's geometry thereby establishing its self-consistency and the logical independence of Euclid's fifth postulate,
• 1873 - Charles Hermite proves that e is transcendental,
• 1873 - Georg Frobenius presents his method for finding series solutions to linear differential equations with regular singular points,
• 1874 - Georg Cantor shows that the set of all real numbers is uncountably infinite but the set of all algebraic numbers is countably infinite. Contrary to widely held beliefs, his method was not his famous diagonal argument, which he published three years later. (Nor did he formulate set theory at this time.)
• 1878 - Charles Hermite solves the general quintic equation by means of elliptic and modular functions
• 1882 - Ferdinand von Lindemann proves that π is transcendental and that therefore the circle cannot be squared with a compass and straightedge,
• 1882 - Felix Klein invents the Klein bottle,
• 1895 - Diederik Korteweg and Gustav de Vries derive the KdV equation to describe the development of long solitary water waves in a canal of rectangular cross section,
• 1895 - Georg Cantor publishes a book about set theory containing the arithmetic of infinite cardinal numbers and the continuum hypothesis,
• 1896 - Jacques Hadamard and Charles de La Vallée-Poussin independently prove the prime number theorem,
• 1896 - Hermann Minkowski presents Geometry of numbers,
• 1899 - Georg Cantor discovers a contradiction in his set theory,
• 1899 - David Hilbert presents a set of self-consistent geometric axioms in Foundations of Geometry,

20th century

• 1900 - David Hilbert states his list of 23 problems which show where some further mathematical work is needed,
• 1901 - Élie Cartan develops the exterior derivative,
• 1903 - Carle David Tolme Runge presents a fast Fourier Transform algorithm,
• 1903 - Edmund Georg Hermann Landau gives considerably simpler proof of the prime number theorem,
• 1908 - Ernst Zermelo axiomizes set theory, thus avoiding Cantor's contradictions,
• 1908 - Josip Plemelj solves the Riemann problem about the existence of a differential equation with a given monodromic group and uses Sokhotsky - Plemelj formulae,
• 1912 - Luitzen Egbertus Jan Brouwer presents the Brouwer fixed-point theorem,
• 1912 - Josip Plemelj publishes simplified proof for the Fermat's last theorem for exponent n = 5,
• 1913 - Srinivasa Aaiyangar Ramanujan sends a long list of complex theorems without proofs to G. H. Hardy,
• 1914 - Srinivasa Aaiyangar Ramanujan publishes Modular Equations and Approximations to π,
• 1910s - Srinivasa Aaiyangar Ramanujan develops over 3000 theorems, including properties of highly composite numbers, the partition function and its asymptotics, and mock theta functions. He also makes major breakthroughs and discoveries in the areas of gamma functions, modular forms, divergent series, hypergeometric series and prime number theory
• 1919 - Viggo Brun defines Brun's constant B₂ for twin primes,
• 1928 - John von Neumann begins devising the principles of game theory and proves the minimax theorem,
• 1930 - Casimir Kuratowski shows that the three cottage problem has no solution,
• 1931 - Kurt Gödel proves his incompleteness theorem which shows that every axiomatic system for mathematics is either incomplete or inconsistent,
• 1931 - Georges de Rham develops theorems in cohomology and characteristic classes,
• 1933 - Karol Borsuk and Stanislaw Ulam present the Borsuk-Ulam antipodal-point theorem,
• 1933 - Andrey Nikolaevich Kolmogorov publishes his book Basic notions of the calculus of probability (Grundbegriffe der Wahrscheinlichkeitsrechnung) which contains an axiomatization of probability based on measure theory,
• 1940 - Kurt Gödel shows that neither the continuum hypothesis nor the axiom of choice can be disproven from the standard axioms of set theory,
• 1942 - G.C. Danielson and Cornelius Lanczos develop a Fast Fourier Transform algorithm,
• 1943 - Kenneth Levenberg proposes a method for nonlinear least squares fitting,
• 1948 - John von Neumann mathematically studies self-reproducing machines,
• 1949 - John von Neumann computes π to 2,037 decimal places using ENIAC,
• 1950 - Stanislaw Ulam and John von Neumann present cellular automata dynamical systems,
• 1953 - Nicholas Metropolis introduces the idea of thermodynamic simulated annealing algorithms,
• 1955 - H. S. M. Coxeter et al. publish the complete list of uniform polyhedron,
• 1955 - Enrico Fermi, John Pasta, and Stanislaw Ulam numerically study a nonlinear spring model of heat conduction and discover solitary wave type behavior,
• 1960 - C. A. R. Hoare invents the quicksort algorithm,
• 1960 - Irving Reed and Gustave Solomon present the Reed-Solomon error-correcting code,
• 1961 - Daniel Shanks and John Wrench compute π to 100,000 decimal places using an inverse-tangent identity and an IBM-7090 computer,
• 1962 - Donald Marquardt proposes the Levenberg-Marquardt nonlinear least squares fitting algorithm,
• 1963 - Paul Cohen uses his technique of forcing to show that neither the continuum hypothesis nor the axiom of choice can be proven from the standard axioms of set theory,
• 1963 - Martin Kruskal and Norman Zabusky analytically study the Fermi-Pasta-Ulam heat conduction problem in the continuum limit and find that the KdV equation governs this system,
• 1965 - Martin Kruskal and Norman Zabusky numerically study colliding solitary waves in plasmas and find that they do not disperse after collisions,
• 1965 - James Cooley and John Tukey present an influential Fast Fourier Transform algorithm,
• 1966 - E.J. Putzer presents two methods for computing the exponential of a matrix in terms of a polynomial in that matrix,
• 1967 - Robert Langlands formulates the influential Langlands program of conjectures relating number theory and representation theory,
• 1968 - Michael Atiyah and Isadore Singer prove the Atiyah-Singer index theorem about the index of elliptic operators,
• 1975 - Benoit Mandelbrot published Les objets fractals, forme, hasard et dimension,
• 1976 - Kenneth Appel and Wolfgang Haken use a computer to prove the Four color theorem,
• 1983 - Gerd Faltings proves the Mordell conjecture and thereby shows that there are only finitely many whole number solutions for each exponent of Fermat's last theorem,
• 1983 - the classification of finite simple groups, a collaborative work involving some hundred mathematicians and spanning thirty years, is completed,
• 1985 - Louis de Branges de Bourcia proves the Bieberbach conjecture,
• 1987 - Yasumasa Kanada, David Bailey, Jonathan Borwein, and Peter Borwein use iterative modular equation approximations to elliptic integrals and a NEC SX-2 supercomputer to compute π to 134 million decimal places,
• 1991 - Alain Connes and John W. Lott develop non-commutative geometry,
• 1994 - Andrew Wiles proves part of the Taniyama-Shimura conjecture and thereby proves Fermat's last theorem,
• 1998 - Thomas Hales (almost certainly) proves the Kepler conjecture,
• 1999 - the full Taniyama-Shimura conjecture is proved.

21st century

• 2000 - the Clay Mathematics Institute establishes the seven Millennium Prize Problems of unsolved important classic mathematical questions,
• 2002 - Manindra Agrawal, Nitin Saxena, and Neeraj Kayal of IIT Kanpur present an unconditional deterministic polynomial time algorithm to determine whether a given number is prime,
• 2002 - Yasumasa Kanada, Y. Ushiro, Hisayasu Kuroda, Makoto Kudoh and a team of nine more compute π to 1241 billion digits using a Hitachi 64-node supercomputer,

Note

1. This article is based on a timeline developed by Niel Brandt (1994) who has given permission for its use in Wikipedia. (See Talk:Timeline of mathematics.)it:Cronologia della matematica

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