9th-century mathematicians

The 9th century was a significant period for mathematics, particularly in the Islamic world, where scholars made substantial contributions that influenced both the development of mathematics and its transmission to Europe. Here are some notable mathematicians and contributions from the 9th century: 1. **Al-Khwarizmi**: Perhaps the most famous mathematician of the 9th century, Al-Khwarizmi is often referred to as the "father of algebra.

Al-Abbās ibn Said al-Jawharī is not a widely recognized figure in historical texts or contemporary sources. It is possible that you may be referring to a more obscure individual, or perhaps there is a typographical error or confusion in the name. The name "al-Jawharī" typically appears in historical and literary contexts, including as a surname or title relating to various scholars, poets, or figures in Arabic history.

Al-Ḥajjāj ibn Yūsuf ibn Maṭar is not a widely recognized historical figure, and it is possible that you might be referring to Al-Ḥajjāj ibn Yūsuf, a prominent figure in early Islamic history. Al-Ḥajjāj ibn Yūsuf al-Thaqafī (circa 661–714 CE) was a governor of Iraq during the Umayyad Caliphate.

Hunayn ibn Ishaq (809–873 AD) was a prominent Nestorian physician, translator, and scholar during the Islamic Golden Age. He is best known for his contributions to the translation movement in the Abbasid Caliphate, where he played a significant role in translating Greek philosophical and medical texts into Arabic. His work helped preserve and disseminate the knowledge of ancient Greek philosophers and scientists, making it accessible to the Arabic-speaking world and later influencing European scholarship during the Middle Ages.

Leo the Mathematician, also known as Leo the Philosopher, was a Byzantine scholar and mathematician who lived during the 9th century. He is often recognized for his contributions to the fields of mathematics and philosophy, particularly within the context of the Byzantine Empire. He is credited with preserving and commenting on ancient Greek mathematical works and is known to have made advances in areas like geometry and number theory.

Na'im ibn Musa is not a widely recognized figure in historical texts or contemporary discourse. There may be individuals or references related to this name in specific cultural or religious contexts, but without more specific details, it is difficult to provide a comprehensive answer.

Tuotilo, also known as Tuotilo of St. Gall, was an important figure in the early medieval period, particularly in the context of monastic life in Switzerland. He was a monk and is often associated with the Abbey of Saint Gall, a significant center of learning and culture during the Carolingian era. Tuotilo was known for his abilities as a musician and artist and is credited with various contributions to the monastic community, including possibly creating illuminated manuscripts and other artistic works.

Yusuf al-Khuri, also known as Joseph al-Khuri, could refer to an individual or a specific context, but as of my last update in October 2023, there is no widely recognized public figure or notable event associated with that name. It's possible that he may be a lesser-known individual, a contemporary figure emerging after my last knowledge update, or a character from a specific cultural, literary, or media context.