### History of mathematics (Islamic mathematics&Medieval European mathematics)

## Islamic mathematics[edit]

Main article: Mathematics in medieval Islam

The Islamic Empire established across Persia, the Middle East, Central Asia, North Africa, Iberia, and in parts of India in the 8th century made significant contributions towards mathematics. Although most Islamic texts on mathematics were written in Arabic, most of them were not written byArabs, since much like the status of Greek in the Hellenistic world, Arabic was used as the written language of non-Arab scholars throughout the Islamic world at the time. Persians contributed to the world of Mathematics alongside Arabs.

In the 9th century, the Persian mathematician Muḥammad ibn Mūsā al-Khwārizmī wrote several important books on the Hindu-Arabic numerals and on methods for solving equations. His book

*On the Calculation with Hindu Numerals*, written about 825, along with the work of Al-Kindi, were instrumental in spreading Indian mathematics and Indian numerals to the West. The word*algorithm*is derived from the Latinization of his name, Algoritmi, and the word*algebra*from the title of one of his works,*Al-Kitāb al-mukhtaṣar fī hīsāb al-ğabr wa’l-muqābala*(*The Compendious Book on Calculation by Completion and Balancing*). He gave an exhaustive explanation for the algebraic solution of quadratic equations with positive roots,^{[107]}and he was the first to teach algebra in an elementary form and for its own sake.^{[108]}He also discussed the fundamental method of "reduction" and "balancing", referring to the transposition of subtracted terms to the other side of an equation, that is, the cancellation of like terms on opposite sides of the equation. This is the operation which al-Khwārizmī originally described as*al-jabr*.^{[109]}His algebra was also no longer concerned "with a series ofproblems to be resolved, but an exposition which starts with primitive terms in which the combinations must give all possible prototypes for equations, which henceforward explicitly constitute the true object of study." He also studied an equation for its own sake and "in a generic manner, insofar as it does not simply emerge in the course of solving a problem, but is specifically called on to define an infinite class of problems."^{[110]}
Further developments in algebra were made by Al-Karaji in his treatise

*al-Fakhri*, where he extends the methodology to incorporate integer powers and integer roots of unknown quantities. Something close to a proof by mathematical induction appears in a book written by Al-Karaji around 1000 AD, who used it to prove the binomial theorem, Pascal's triangle, and the sum of integral cubes.^{[111]}The historian of mathematics, F. Woepcke,^{[112]}praised Al-Karaji for being "the first who introduced the theory of algebraic calculus." Also in the 10th century, Abul Wafa translated the works ofDiophantus into Arabic. Ibn al-Haytham was the first mathematician to derive the formula for the sum of the fourth powers, using a method that is readily generalizable for determining the general formula for the sum of any integral powers. He performed an integration in order to find the volume of aparaboloid, and was able to generalize his result for the integrals of polynomials up to the fourth degree. He thus came close to finding a general formula for the integrals of polynomials, but he was not concerned with any polynomials higher than the fourth degree.^{[113]}
In the late 11th century, Omar Khayyam wrote

*Discussions of the Difficulties in Euclid*, a book about what he perceived as flaws in Euclid's*Elements*, especially the parallel postulate. He was also the first to find the general geometric solution to cubic equations. He was also very influential in calendar reform.^{[citation needed]}
In the 13th century, Nasir al-Din Tusi (Nasireddin) made advances in spherical trigonometry. He also wrote influential work on Euclid's parallel postulate. In the 15th century, Ghiyath al-Kashicomputed the value of π to the 16th decimal place. Kashi also had an algorithm for calculating

*n*th roots, which was a special case of the methods given many centuries later by Ruffini andHorner.
Other achievements of Muslim mathematicians during this period include the addition of the decimal point notation to the Arabic numerals, the discovery of all the modern trigonometric functionsbesides the sine, al-Kindi's introduction of cryptanalysis and frequency analysis, the development of analytic geometry by Ibn al-Haytham, the beginning of algebraic geometry by Omar Khayyam and the development of an algebraic notation by al-Qalasādī.

^{[114]}
During the time of the Ottoman Empire and Safavid Empire from the 15th century, the development of Islamic mathematics became stagnant.

## Medieval European mathematics[edit]

Medieval European interest in mathematics was driven by concerns quite different from those of modern mathematicians. One driving element was the belief that mathematics provided the key to understanding the created order of nature, frequently justified by Plato's

*Timaeus*and the biblical passage (in the*Book of Wisdom*) that God had*ordered all things in measure, and number, and weight*.^{[115]}
Boethius provided a place for mathematics in the curriculum in the 6th century when he coined the term

*quadrivium*to describe the study of arithmetic, geometry, astronomy, and music. He wrote*De institutione arithmetica*, a free translation from the Greek of Nicomachus's*Introduction to Arithmetic*;*De institutione musica*, also derived from Greek sources; and a series of excerpts from Euclid's*Elements*. His works were theoretical, rather than practical, and were the basis of mathematical study until the recovery of Greek and Arabic mathematical works.^{[116]}^{[117]}
In the 12th century, European scholars traveled to Spain and Sicily seeking scientific Arabic texts, including al-Khwārizmī's

*The Compendious Book on Calculation by Completion and Balancing*, translated into Latin by Robert of Chester, and the complete text of Euclid's*Elements*, translated in various versions by Adelard of Bath, Herman of Carinthia, and Gerard of Cremona.^{[118]}^{[119]}
See also: Latin translations of the 12th century

These new sources sparked a renewal of mathematics. Fibonacci, writing in the

*Liber Abaci*, in 1202 and updated in 1254, produced the first significant mathematics in Europe since the time ofEratosthenes, a gap of more than a thousand years. The work introduced Hindu-Arabic numerals to Europe, and discussed many other mathematical problems.
The 14th century saw the development of new mathematical concepts to investigate a wide range of problems.

^{[120]}One important contribution was development of mathematics of local motion.
Thomas Bradwardine proposed that speed (V) increases in arithmetic proportion as the ratio of force (F) to resistance (R) increases in geometric proportion. Bradwardine expressed this by a series of specific examples, but although the logarithm had not yet been conceived, we can express his conclusion anachronistically by writing: V = log (F/R).

^{[121]}Bradwardine's analysis is an example of transferring a mathematical technique used by al-Kindi and Arnald of Villanova to quantify the nature of compound medicines to a different physical problem.^{[122]}
One of the 14th-century Oxford Calculators, William Heytesbury, lacking differential calculus and the concept of limits, proposed to measure instantaneous speed "by the path that

**would**be described by [a body]**if**... it were moved uniformly at the same degree of speed with which it is moved in that given instant".^{[123]}
Heytesbury and others mathematically determined the distance covered by a body undergoing uniformly accelerated motion (today solved by integration), stating that "a moving body uniformly acquiring or losing that increment [of speed] will traverse in some given time a [distance] completely equal to that which it would traverse if it were moving continuously through the same time with the mean degree [of speed]".

^{[124]}
Nicole Oresme at the University of Paris and the Italian Giovanni di Casali independently provided graphical demonstrations of this relationship, asserting that the area under the line depicting the constant acceleration, represented the total distance traveled.

^{[125]}In a later mathematical commentary on Euclid's*Elements*, Oresme made a more detailed general analysis in which he demonstrated that a body will acquire in each successive increment of time an increment of any quality that increases as the odd numbers. Since Euclid had demonstrated the sum of the odd numbers are the square numbers, the total quality acquired by the body increases as the square of the time.^{[126]}
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