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century were the two main precursors of algebra 29 30 diophantus solved some equations involving unknown natural numbers by deducing new relations until he obtained the solution 31 al khwarizmi introduced systematic methods for transforming equations such as moving a term from one side of an equation into the other side 32 the term algebra is derived from the arabic word al jabr meaning the reunion of broken parts that he used for naming one of these methods in the title of his main treatise 33 34 algebra became an area in its own right only with françois viète 1540 1603 who introduced the use of variables for representing unknown or unspecified numbers 35 variables allow mathematicians to describe the operations that have to be done on the numbers represented using mathematical formulas 36 until the 19th century algebra consisted mainly of the study of linear equations presently linear algebra and polynomial equations in a single unknown which were called algebraic equations a term still in use although it may be ambiguous during the 19th century mathematicians began to use variables to represent things other than numbers such as matrices modular integers and geometric transformations on which generalizations of arithmetic operations are often valid 37 the concept of algebraic structure addresses this consisting of a set whose elements are unspecified of operations acting on the elements of the set and rules that these operations must follow the scope of algebra thus grew to include the study of algebraic structures this object of algebra was called modern algebra or abstract algebra as established by the influence and works of emmy noether 38 and popularized by van der waerden s book moderne algebra some types of algebraic structures have useful and often fundamental properties in many areas of mathematics their study became autonomous parts of algebra and include 9 group theory field theory vector spaces whose study is essentially the same as linear algebra ring theory commutative algebra which is the study of commutative rings includes the study of polynomials and is a foundational part of algebraic geometry homological algebra lie algebra and lie group theory boolean algebra which is widely used for the study of the logical structure of computers the study of types of algebraic structures as mathematical objects is the purpose of universal algebra and category theory 39 the latter applies to every mathematical structure not only algebraic ones at its origin it was introduced together with homological algebra for allowing the algebraic study of non algebraic objects such as topological spaces this particular area of application is called algebraic topology 40 calculus and analysis main articles calculus and mathematical analysis a cauchy sequence consists of elements such that all subsequent terms of a term become arbitrarily close to each other as the sequence progresses from left to right calculus formerly called infinitesimal calculus was introduced independently and simultaneously by 17th century mathematicians newton and leibniz 41 it is fundamentally the study of the relationship between variables that depend continuously on each other calculus was expanded in the 18th century by euler with the introduction of the concept of a function and many other results 42 presently calculus refers mainly to the elementary part of this theory and analysis is commonly used for advanced parts 43 analysis is further subdivided into real analysis where variables represent real numbers and complex analysis where variables represent complex numbers analysis includes many subareas shared by other areas of mathematics which include 9 multivariable calculus functional analysis where variables represent varying functions integration measure theory and potential theory all strongly related with probability theory on a continuum ordinary differential equations partial differential equations numerical analysis mainly devoted to the computation of solutions of ordinary and partial differential equations that arise in many applications discrete mathematics main article discrete mathematics a diagram representing a two state markov chain the states are represented by a and e the numbers are the probability of flipping the state discrete mathematics broadly speaking is the study of individual countable mathematical objects an example is the set of all integers 44 because the objects of study here are discrete the methods of calculus and mathematical analysis do not directly apply c algorithms especially their implementation and computational complexity play a major role in discrete mathematics 45 the four color theorem and optimal sphere packing were two major problems of discrete mathematics solved in the second half of the 20th century 46 the p versus np problem which remains open to this day is also important for discrete mathematics since its solution would potentially impact a large number of computationally difficult problems 47 discrete mathematics includes 9 combinatorics the art of enumerating mathematical objects that satisfy some given constraints originally these objects were elements or subsets of a given set this has been extended to various objects which establishes a strong link between combinatorics and other parts of discrete mathematics for example discrete geometry includes counting configurations of geometric shapes graph theory and hypergraphs coding theory including error correcting codes and a part of cryptography matroid theory discrete geometry discrete probability distributions game theory although continuous games are also studied most common games such as chess and poker are discrete discrete optimization including combinatorial optimization integer programming constraint programming mathematical logic and set theory main articles mathematical logic and set theory the venn diagram is a commonly used method to illustrate the relations between sets the two subjects of mathematical logic and set theory have belonged to mathematics since the end of the 19th century 48 49 before this period sets were not considered to be mathematical objects and logic although used for mathematical proofs belonged to philosophy and was not specifically studied by mathematicians 50 before cantor s study of infinite sets mathematicians were reluctant to consider actually infinite collections and considered infinity to be the result of endless enumeration cantor s work offended many mathematicians not only by considering actually infinite sets 51 but by showing that this implies different sizes of infinity per cantor s diagonal argument this led to the controversy over cantor s set theory 52 in the same period various areas of mathematics concluded the former intuitive definitions of the basic mathematical objects were insufficient for ensuring mathematical rigor 53 this became the foundational crisis of mathematics 54 it was eventually solved in mainstream mathematics by systematizing the axiomatic method inside a formalized set theory roughly speaking each mathematical object is defined by the set of all similar objects and the properties that these objects must have 16 for example in peano arithmetic the natural numbers are defined by zero is a number each number has a unique successor each number but zero has a unique predecessor and some rules of reasoning 55 this mathematical abstraction from reality is embodied in the modern philosophy of formalism as founded by david hilbert around 1910 56 the nature of the objects defined this way is a philosophical problem that mathematicians leave to philosophers even if many mathematicians have opinions on this nature and use their opinion sometimes called intuition to guide their study and proofs the approach allows considering logics that is sets of allowed deducing rules theorems proofs etc as mathematical objects and to prove theorems about them for example gödel s incompleteness theorems assert roughly speaking that in every consistent formal system that contains the natural numbers there are theorems that are true that is provable in a stronger system but not provable inside the system 57 this approach to the foundations of mathematics was challenged during the first half of the 20th century by mathematicians led by brouwer who promoted intuitionistic logic which explicitly lacks the law of excluded middle 58 59 these problems and debates led to a wide expansion of mathematical logic with subareas such as model theory modeling some logical theories inside other theories proof theory type theory computability theory and computational complexity theory 9 although these aspects of mathematical logic were introduced before the rise of computers their use in compiler design formal verification program analysis proof assistants and other aspects of computer science contributed in turn to the expansion of these logical theories 60 computational mathematics main article computational mathematics computational mathematics is the study of mathematical problems that are typically too large for human computing capacity 61 62 part of computational mathematics involves numerical analysis which is devoted to computation with approximations of real numbers floating point arithmetic numerical analysis provides methods for problems in analysis using functional analysis and approximation theory numerical analysis broadly includes the study of approximation and discretization with special focus on rounding errors 63 numerical analysis and more broadly scientific computing also study non analytic topics of mathematical science especially algorithmic matrix and graph theory another area of computational mathematics is computer algebra which consists mainly of the manipulation of mathematical formulas on a computer automated theorem proving which include proof assistants and proof checkers is another area of computational mathematics that is used for formal verification and allowed formal proof of difficult theorems of mathematics such feit thompson theorem on finite groups algorithmics a large part of discrete mathematics and public key cryptography are also often considered as a part of computational mathematics history main article history of mathematics etymology the word mathematics comes from the ancient greek word máthēma μάθημα meaning something learned knowledge mathematics and the derived expression mathēmatikḗ tékhnē μαθηματικὴ τέχνη meaning mathematical science it entered the english language during the late middle english period through french and latin 64 traditionally one of the two main schools of thought in pythagoreanism was known as the mathēmatikoi μαθηματικοί which at the time meant learners rather than mathematicians in the modern sense the pythagoreans were likely the first to constrain the use of the word to just the study of arithmetic and geometry by the time of aristotle 384 322 bc this meaning was fully established 65 in latin and english until around 1700 the term mathematics more commonly meant astrology or sometimes astronomy rather than mathematics the meaning gradually changed to its present one from about 1500 to 1800 this change has resulted in several mistranslations for example saint augustine s warning that christians should beware of mathematici meaning astrologers is sometimes mistranslated as a condemnation of mathematicians 66 the apparent plural form in english goes back to the latin neuter plural mathematica cicero based on the greek plural ta mathēmatiká τὰ μαθηματικά and means roughly all things mathematical although it is plausible that english borrowed only the adjective mathematic al and formed the noun mathematics anew after the pattern of physics and metaphysics inherited from greek 67 in english the noun mathematics takes a singular verb it is often shortened to maths 68 or in north america math 69 ancient in addition to recognizing how to count physical objects prehistoric peoples may have also known how to count abstract quantities like time days seasons or years 70 71 image of problem 14 from the egyptian moscow mathematical papyrus the problem includes a diagram indicating the dimensions of the truncated pyramid archaeological evidence has suggested that the ancient egyptian counting system had origins in sub saharan africa 72 also fractal geometry designs which are widespread among sub saharan african cultures are also found in egyptian architecture and cosmological signs 73 the ishango bone according to scholar alexander marshack may have influenced the later development of mathematics in egypt as like some entries on the ishango bone egyptian arithmetic also made use of multiplication by 2 this however is disputed 74 megalithic structures located in nabta playa upper egypt featured astronomy calendar arrangements in alignment with the heliacal rising of sirius and supported calibration of the yearly calendar for the annual nile flood 75 ancient nubians established a system of geometric rules which served as the basis for initial sunclocks nubians also exercised a trigonometric methodology comparable to their egyptian counterparts 76 77 78 79 the babylonian mathematical tablet plimpton 322 dated to 1800 bc evidence for more complex mathematics does not appear until around 3000 bc when the babylonians and egyptians began using arithmetic algebra and geometry for taxation and other financial calculations for building and construction and for astronomy 80 the oldest mathematical texts from mesopotamia and egypt are from 2000 to 1800 bc 81 many early texts mention pythagorean triples and so by inference the pythagorean theorem seems to be the most ancient and widespread mathematical concept after basic arithmetic and geometry it is in babylonian mathematics that elementary arithmetic addition subtraction multiplication and division first appear in the archaeological record the babylonians also possessed a place value system and used a sexagesimal numeral system which is still in use today for measuring angles and time 82 by the 5th century bc greek mathematics began to emerge as a distinct discipline and some ancient greeks such as the pythagoreans appeared to have considered it a subject in its own right 83 around 300 bc euclid organized mathematical knowledge by way of postulates and first principles which evolved into the axiomatic method that is used in mathematics today consisting of definition axiom theorem and proof 84 his book elements covers geometry and number theory and is widely considered the most successful and influential textbook of all time 85 another notable mathematician of antiquity is archimedes of syracuse c 287 c 212 bc 86 he developed methods for calculating the surface area and volume of solids of revolution including using the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series in a manner reminiscent of modern calculus 87 other notable achievements of greek m...
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