Saya mau tau Al-Baghdadi dari Matematik pada zaman pertengahan Islam. Jelaskan dalam bahasa melayu

Arab mathematician al-Baghdadi (b. 980) looked at a slight variant of Thabit ibn Qurra's theorem of amicable numbers. There were three different types of arithmetic used around this period and, by the end of the 10th century, authors such as al-Baghdadi were writing texts comparing the three numeral systems: Finger-reckoning arithmetic (a system derived from counting on the fingers with the numerals written entirely in words), the sexagesimal numeral system (developed by the Babylonians), and the Indo-Arabic numerals. This third system of calculating allowed most of the advances in numerical methods. Al-Baghdadi also contributed to improvements in the Indo-Arabic decimal system.