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Ibn alBanna is also known as Abu'lAbbas Ahmad ibn Muhammad ibn Uthman alAzdi. It is a little unclear whether alBanna was born in the city of Marrakesh or whether it was the region of Marrakesh which was named Morocco by Europeans. There is a claim that alBanna was born in Granada in Spain and moved to North Africa for his education. What is certain is that he spent most of his life in Morocco.
The Marinids tribe were allies of the Umayyad caliphs of Córdoba. The tribe lived in eastern Morocco then, under their ruler Abu Yahya, they began to conquer the region. The Marinids captured Fez in 1248 and made it their capital. They captured Marrakesh from the ruling Almohads tribe in 1269, thus taking control of the whole of Morocco. Having conquered Morocco, the Marinids tried to help Granada to prevent the Christian advance through their country. The strong link between Granada and Morocco may account for the confusion as to which country alBanna was a native.
Morocco was certainly the country that alBanna was educated in, learning the leading mathematical skills of the period. He studied geometry in general, and Euclid's Elements in particular. He also studied fractional numbers and learnt much of the impressive contributions that the Arabs had made to mathematics over the preceding 400 years. The Marinids had a strong culture for learning and Fez became their centre of learning. At the university in Fez AlBanna taught all branches of mathematics, which at this time included arithmetic, algebra, geometry and astronomy. Fez was a thriving city with a new quarter being built housing the Royal Palace and the adjoining Great Mosque. Many students studied under alBanna in this thriving academic community.
It is clear that alBanna wrote a large number of works, in fact 82 are listed by Renaud (see for example [9]). Not all are on mathematics, but the mathematical texts included an introduction to Euclid's Elements, an algebra text and various works on astronomy. One difficulty with the works on mathematics is knowing how much of the material which alBanna presents is original and how much is simply his version of work by earlier Arab mathematicians which has been lost. We should certainly say that alBanna does not claim any originality and, indeed, the style of his writing would suggest that he is collecting together ideas that he has learnt from other mathematicians.
Two "firsts" for alBanna are that he seems to have been the first to consider a fraction as a ratio between two numbers (see [12] for more details) and he is the first to use the expression almanakc (in Arabic almanakh meaning weather) in a work containing astronomical and meteorological data.
Perhaps alBanna's most famous work is Talkhis amal alhisab (Summary of arithmetical operations) and the Raf alHijab which is alBanna's own commentary on the Talkhis amal alhisab. It is in this work that alBanna introduces some mathematical notation which has led certain authors to believe that algebraic symbolism was first developed in Islam by ibn alBanna and alQalasadi (see for example [6]). We refer the reader to the biography of alQalasadi where we present arguments to show that neither alBanna nor alQalasadi were the inventors of mathematical notation.
There are, however, many interesting mathematical ideas and results which appear in the Raf alHijab. For example it contains continued fractions and they are used to compute approximate square roots. Other interesting results on summing series are the results
1^{3} + 3^{3} + 5^{3} + ... + (2n1)^{3} = n^{2}(2n^{2}  1) and
1^{2} + 3^{2} + 5^{2} + ... + (2n1)^{2} = (2n + 1)2n(2n  1)/6.
Perhaps the most interesting of all is the work on binomial coefficients which is described in detail in [2] and [3]. If we denote the binomial coefficient p choose k by _{p}C_{k} then alBanna shows that
_{p}C_{2} = p(p1)/2
and then that
_{p}C_{3} = _{p}C_{2}(p2)/3.
He writes (see for example [2] or [3]):
... the ternary combination is thus obtained by multiplying the third of the third term preceding the given number; and so we always multiply the combination that precedes the combination sought by the number that precedes the given number, and whose distance to it is equal to the number of combinations sought. From the product, we take the part that names the number of combinations.
Although this is a little difficult to interpret, what alBanna is stating here is that
_{p}C_{k} = _{p}C_{k1}(p  (k  1) )/k.
He then goes on to give the familiar (to us) result
_{p}C_{k} = p(p  1)(p  2)...(p  k + 1)/(k !)
As Rashed points out in [2], this is only a small step from the Pascal triangle results given three hundred years earlier by alKaraji, then still one hundred years before alBanna by alSamawal. However Rashed writes:
... in our opinion, there is something more fundamental than [the Pascal triangle] results; it is precisely the combinatorial appearance of ibn alBanna's exposition, together with the relation he partially establishes between polygonal numbers and combinations. It concern, in the first place, triangular numbers and combinations of p objects in twos, and then polygonal numbers of order 4 and combinations of p objects in threes.
Article by: J J O'Connor and E F Robertson
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List of References (12 books/articles)
 
Mathematicians born in the same country

Crossreferences in MacTutor
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