Question: What subject was studied where Jean-Sélim Kanaan died?

full_context: Document 1: Mesopotamia: Mesopotamia is a historical region in West Asia situated within the Tigris -- Euphrates river system, in modern days roughly corresponding to most of Iraq plus Kuwait, the eastern parts of Syria, Southeastern Turkey, and regions along the Turkish -- Syrian and Iran -- Iraq borders.
Document 2: History of science: From their beginnings in Sumer (now Iraq) around 3500 BC, the Mesopotamian people began to attempt to record some observations of the world with numerical data. But their observations and measurements were seemingly taken for purposes other than for elucidating scientific laws. A concrete instance of Pythagoras' law was recorded, as early as the 18th century BC: the Mesopotamian cuneiform tablet Plimpton 322 records a number of Pythagorean triplets (3,4,5) (5,12,13). ..., dated 1900 BC, possibly millennia before Pythagoras,  but an abstract formulation of the Pythagorean theorem was not.
Document 3: Ancient Near East: The ancient Near East was the home of early civilizations within a region roughly corresponding to the modern Middle East: Mesopotamia (modern Iraq, southeast Turkey, southwest Iran, northeastern Syria and Kuwait), ancient Egypt, ancient Iran (Elam, Media, Parthia and Persia), Anatolia / Asia Minor and Armenian Highlands (Turkey's Eastern Anatolia Region, Armenia, northwestern Iran, southern Georgia, and western Azerbaijan), the Levant (modern Syria, Lebanon, Palestine, Israel, and Jordan), Cyprus and the Arabian Peninsula. The ancient Near East is studied in the fields of Near Eastern archaeology and ancient history.
Document 4: Yahya Kanu: Colonel Yahya Kanu (born in Magburaka, Tonkolili District, Sierra Leone, died 29 December 1992) Kanu was a loyalist to president Joseph Saidu Momoh, and his position in the coup is unclear. He was first reported by Reuters to have led the coup, but that same day he went onto the BBC's "Focus on Africa" to deny that role, claiming instead that he was attempting to negotiate with the mutineers. He was imprisoned by Valentine Strasser, who eventually took power in the coup. Kanu was later executed by Valentine Strasser, Solomon Musa and Idriss Kamara on a beach near Freetown, after being accused of organizing a counter-coup with All People's Congress supporter Bambay Kamara. The pair were at the time interred in the Pademba Road jail in Freetown.
Document 5: Jamal Akal: A Canadian citizen, Jamal Akal (جمال عكل) was arrested by Israeli security forces in 2003, and accused of conspiring with Hamas leaders to target and assassinate an Israeli politician travelling to the United States.
Document 6: History of mathematics: Babylonian mathematics refers to any mathematics of the peoples of Mesopotamia (modern Iraq) from the days of the early Sumerians through the Hellenistic period almost to the dawn of Christianity. The majority of Babylonian mathematical work comes from two widely separated periods: The first few hundred years of the second millennium BC (Old Babylonian period), and the last few centuries of the first millennium BC (Seleucid period). It is named Babylonian mathematics due to the central role of Babylon as a place of study. Later under the Arab Empire, Mesopotamia, especially Baghdad, once again became an important center of study for Islamic mathematics.
Document 7: Hilal Al-Ahmadi: Hilal Al-Ahmadi (1954? – 17 February 2011), who was an Iraqi veteran journalist with over 30 years of experience and well known for his reports about corruption, was assassinated in front of his home east of Mosul, Iraq.
Document 8: History of science: In Babylonian astronomy, records of the motions of the stars, planets, and the moon are left on thousands of clay tablets created by scribes. Even today, astronomical periods identified by Mesopotamian proto-scientists are still widely used in Western calendars such as the solar year and the lunar month. Using these data they developed arithmetical methods to compute the changing length of daylight in the course of the year and to predict the appearances and disappearances of the Moon and planets and eclipses of the Sun and Moon. Only a few astronomers' names are known, such as that of Kidinnu, a Chaldean astronomer and mathematician. Kiddinu's value for the solar year is in use for today's calendars. Babylonian astronomy was "the first and highly successful attempt at giving a refined mathematical description of astronomical phenomena." According to the historian A. Aaboe, "all subsequent varieties of scientific astronomy, in the Hellenistic world, in India, in Islam, and in the West—if not indeed all subsequent endeavour in the exact sciences—depend upon Babylonian astronomy in decisive and fundamental ways."
Document 9: Hannibal Muammar Gaddafi: Gaddafi was the first consultant to the Management Committee of the General National Maritime Transport Company (GNMTC) of Libya. He was appointed to this position in 2007, upon earning his MBA degree in Shipping Economics and Logistics from Copenhagen Business School.Gaddafi is married to Aline Skaf, a Lebanese Christian former lingerie model, with whom he has three children. Another child, Carthage Hannibal (b. 2 August 2008), was killed in the bombing raid of the family compound on 30 April 2011
Document 10: History of science: In mathematics, the Persian mathematician Muhammad ibn Musa al-Khwarizmi gave his name to the concept of the algorithm, while the term algebra is derived from al-jabr, the beginning of the title of one of his publications. What is now known as Arabic numerals originally came from India, but Muslim mathematicians did make several refinements to the number system, such as the introduction of decimal point notation. Sabian mathematician Al-Battani (850-929) contributed to astronomy and mathematics, while Persian scholar Al-Razi contributed to chemistry and medicine.
Document 11: Ghazi Kanaan: Ghazi Kanaan (1942 – 12 October 2005) (; transliterations vary), also known as Abu Yo'roub, was Syria's Interior Minister from 2004 to 2005, and long-time head of Syria's security apparatus in Lebanon. His violent death during an investigation into the assassination of Rafik Hariri drew international attention.
Document 12: Jean-Sélim Kanaan: Jean-Sélim Kanaan (July 28, 1970 – August 19, 2003) was a United Nations (UN) diplomat, Egyptian, Italian and French national, who was killed in the Canal Hotel bombing in Baghdad, Iraq, along with Sérgio Vieira de Mello and other members of his staff. Born in Rome, Italy, he was the son of an Egyptian UN diplomat, and he spoke seven languages.
Document 13: Abu Hamza Rabia: According to American intelligence officials, Rabia was al-Qaeda's third in command. Few details have been made available about his background, although CNN reports confirmed his Egyptian origins and indicated that he was in his thirties. He and four other men, two of them also Arabs, were killed in the village of Asoray, near Miranshah, the capital of North Waziristan. His death stirred controversy because it was Pakistani policy that US forces were not allowed in the country.
Document 14: Citizen of the World: The Sergio Vieira de Mello Citizen of the World award is given out by the United Nations Correspondents Association to those deemed to have made a significant contribution. It was initiated in 2003, in honour of Brazilian diplomat Sergio Vieira de Mello, the UN High Commissioner for Human Rights, who was killed in the 2003 bombing of the UN headquarters in Iraq. Recipients of this award include Oscar-winning actress Nicole Kidman, actress and UNHCR Goodwill Ambassador Angelina Jolie, and former UN weapons inspector Hans Blix.
Document 15: Muslim world: The Islamic Golden Age coincided with the Middle Ages in the Muslim world, starting with the rise of Islam and establishment of the first Islamic state in 622. The end of the age is variously given as 1258 with the Mongolian Sack of Baghdad, or 1492 with the completion of the Christian Reconquista of the Emirate of Granada in Al-Andalus, Iberian Peninsula. During the reign of the Abbasid caliph Harun ar-Rashid (786 to 809), the legendary House of Wisdom was inaugurated in Baghdad where scholars from various parts of the world sought to translate and gather all the known world's knowledge into Arabic. The Abbasids were influenced by the Quranic injunctions and hadiths, such as "the ink of a scholar is more holy than the blood of a martyr," that stressed the value of knowledge. The major Islamic capital cities of Baghdad, Cairo, and Córdoba became the main intellectual centers for science, philosophy, medicine, and education. During this period, the Muslim world was a collection of cultures; they drew together and advanced the knowledge gained from the ancient Greek, Roman, Persian, Chinese, Indian, Egyptian, and Phoenician civilizations.
ground_truth: Islamic mathematics
sub_queries: In what place did Jean-Sélim Kanaan die? Answer: Baghdad
What subject was studied in Baghdad ? Answer: Islamic mathematics