# Ibn al-Banna' al-Marrakushi

Ibn al‐Bannāʾ al‐Marrākushī | |
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Born | 29 or 30 December 1256 |

Died | 31 July 1321 |

Residence | Islamic civilization |

Academic background | |

Influences | Al-Zarqali, Ibn Isḥāq al‐Tūnisī |

Academic work | |

Era | Islamic Golden Age |

Main interests | Mathematics, Astronomy |

Moroccan literature |
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Moroccan writers |

Forms |

Criticism and awards |

See also |

**Ibn al‐Bannāʾ al‐Marrākushī**, also known as **Abu'l-Abbas Ahmad ibn Muhammad ibn Uthman** (Arabic: ابن البنّاء)
(29 December 1256 – c. 1321), was a Moroccan-berber^{[1]} mathematician, astronomer, Islamic scholar, Sufi, and a one-time astrologer.

## Biography[edit]

Ibn al-Banna' (lit. the son of the architect) was born in Marrakesh in 1256; he is named al‐Marrākushī after that city.^{[2]} Having learned basic mathematical and geometrical skills, he translated Euclid's Elements into Arabic.^{[2]}^{[3]}^{[4]}^{[5]}^{[6]}

## Works[edit]

Ibn al-Banna' wrote between 51 and 74 treatises, encompassing such varied topics as Algebra, Astronomy, Linguistics, Rhetoric, and Logic. One of his works, called *Talkhīṣ ʿamal al-ḥisāb* (Arabic: تلخيص أعمال الحساب) (Summary of arithmetical operations), includes topics such as fractions, sums of squares and cubes etc. Another, called *Tanbīh al-Albāb*,^{[7]} covers topics related to:

- calculations regarding the drop in irrigation canal levels,
- arithmetical explanation of the Muslim laws of inheritance
- determination of the hour of the Asr prayer,
- explanation of frauds linked to instruments of measurement,
- enumeration of delayed prayers which have to be said in a precise order, and
- calculation of legal tax in the case of a delayed payment

He also wrote *Rafʿ al-Ḥijāb (Lifting the Veil)* which covered topics such as computing square roots of a number and the theory of continued fractions;^{[2]} this was the first mathematical work since Brahmagupta to use an algebraic notation, further developed by Abū al-Hasan ibn Alī al-Qalasādī two centuries later.^{[8]}

## Legacy[edit]

The crater Al-Marrakushi on the Moon is named after him.

## See also[edit]

## References[edit]

**^**Humez, Alexander; Humez, Nicholas; Maguire, Joseph (1994).*Zero to Lazy Eight: The Romance Numbers*. Simon and Schuster. ISBN 9780671742812.- ^
^{a}^{b}^{c}G. Sarton: Introduction to the History of Science; The Carnegie Institution; Washington; 1927; vol 2; p. 998. **^**O'Connor, John J.; Robertson, Edmund F., "al-Marrakushi ibn Al-Banna",*MacTutor History of Mathematics archive*, University of St Andrews.**^**Jabbar, Ahmed; Ablagh, Mohammed (2001).*Life and Works of Ibn al-Banaa al-Murrakushi*. Rabat: Faculty of Letters.**^**Samsó, Julio (2007). "Ibn al‐Bannāʾ: Abū al‐ʿAbbās Aḥmad ibn Muḥammad ibn ʿUthmān al‐Azdī al‐Marrākushī". In Hockey, Thomas; et al. (eds.).*The Biographical Encyclopedia of Astronomers*. New York: Springer. pp. 551–2. ISBN 978-0-387-31022-0. (PDF version)**^**Vernet, J. (2008) [1970–1980]. "Ibn Al-Bannā Al Marrākushī".*Complete Dictionary of Scientific Biography*. Encyclopedia.com.**^**A Djebbar: Mathematics in medieval Maghreb; AMUCHMA-Newsletter 15; Universidade Pedagógico (UP), Maputo (Mozambique), 15.9.1995.**^**O'Connor, John J.; Robertson, Edmund F., "al-Marrakushi ibn Al-Banna",*MacTutor History of Mathematics archive*, University of St Andrews.

## External links[edit]

- 1256 births
- 1321 deaths
- 13th-century mathematicians
- 14th-century mathematicians
- 13th-century Muslims
- 14th-century Muslims
- Astronomers of medieval Islam
- Mathematicians of medieval Islam
- Moroccan writers
- Medieval Moroccan astronomers
- Medieval Moroccan mathematicians
- Medieval Arab astronomers
- Medieval Arab mathematicians
- Algebraists
- Geometers
- People from Marrakesh
- Mathematicians who worked on Islamic inheritance
- Scientists who worked on Qibla determination
- 13th-century astronomers
- 13th-century Moroccan people
- 14th-century Moroccan people
- Azd