Ibn al-Yasamin al-Ishbilli

Abu Muhammad ‘Abdallah ibn Muhammad ibn Hajjaj al-Adrini, more commonly known as Ibn al-Yasamin. As his name indicates, he was originally from a Berber tribe from the Maghreb (North Africa). Although his exact date of birth is unknown, we can reasonably place it in the second half of the twelfth century. His education was not restricted to mathematics, he also became famous in the fields of law and literature, particularly in the Andalusian poetry of the Muwashshahat. Ibn al-Yasamin’s famous algebraic poem was drafted in Seville and that, in 1190 also in Seville, he was using it in his teaching.

The best-known work of Ibn al-Yasamin is a poem of fifty three verses in rajaz metre entitled al-Urjuza al-yasminiyya fi al-jabr wa’l-muqabala (Poem on Algebra and Restoration). In it the author defines the algebra known in his time – number, root, and sequence, then the six canonical equations of al-Khwarizmi with the processes of solving them, and finally, the operations of algebra – the restoration, comparison, multiplication, and division of monomials.

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