Question: What subject was studied in the city where Hadi al-Mahdi died?

full_context: Document 1: 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 2: Ayat Al-Qurmezi: Al-Qurmezi became famous in Bahrain and internationally after reading out a poem criticising Bahraini government policies to the Pearl Roundabout gathering of pro-democracy protesters. After the poem was widely circulated via social media she and her family were subjected to harassment and death threats.
Document 3: Naji al-Ali: He drew over 40,000 cartoons, which often reflected Palestinian and Arab public opinion and were sharply critical commentaries on Palestinian and Arab politics and political leaders. He is perhaps best known as creator of the character Handala, pictured in his cartoons as a young witness of the satirized policy or event depicted, and who has since become an icon of Palestinian defiance. On 22 July 1987, while outside the London offices of "al-Qabas", a Kuwaiti newspaper for which he drew political caricatures, al-Ali was shot in the neck and mortally wounded. Naji al-Ali died five weeks later in Charing Cross Hospital.
Document 4: State of the Union: What began as a communication between president and Congress has become a communication between the president and the people of the United States. Since the advent of radio, and then television, the speech has been broadcast live on most networks, preempting scheduled programming. To reach the largest audience, the speech, once given during the day, is now typically given in the evening, after 9pm ET (UTC - 5).
Document 5: 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 6: Muammar Gaddafi: Biographers Blundy and Lycett believed that he was "a populist at heart." Throughout Libya, crowds of supporters would turn up to public events at which he appeared; described as "spontaneous demonstrations" by the government, there are recorded instances of groups being coerced or paid to attend. He was typically late to public events, and would sometimes not show up at all. Although Bianco thought he had a "gift for oratory", he was considered a poor orator by biographers Blundy and Lycett. Biographer Daniel Kawczynski noted that Gaddafi was famed for his "lengthy, wandering" speeches, which typically involved criticising Israel and the U.S.
Document 7: Hadi al-Mahdi: "The New York Times", which wrote a profile on him one year before he was killed, compared him to Rush Limbaugh in his visibility and impact: "arguably the most breathtaking exercise of free speech in a place where its limits are still being established. It is, by some accounts, one of the most popular programs on the air in Baghdad. It is, without question, immensely entertaining."
Document 8: 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.
Document 9: 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 10: 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 11: 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 12: 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 13: Communications in Somalia: Other radio stations based in Mogadishu include Mustaqbal Media corporation and the Shabelle Media Network, the latter of which was in 2010 awarded the Media of the Year prize by the Paris-based journalism organisation, Reporters Without Borders (RSF). In total, about one short-wave and ten private FM radio stations broadcast from the capital, with several radio stations broadcasting from the central and southern regions.
Document 14: 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 15: 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.
ground_truth: Islamic mathematics
sub_queries: Hadi al-Mahdi >> place of death Answer: Baghdad
What subject was studied in Baghdad ? Answer: Islamic mathematics