Arithmetics: Dixit algorizmi...

• Kitāb al-Jam‘ wat-Tafrīq bi-Ḥisāb al-Hi("The Book of Addition and Subtraction According to the Hindu Calculation")
• Arabic original of the book has been lost
• 12th century translation by Adelard of Bath (starting with "so said alKhwarizmi") introduced Hindu numerals in the west
• Hindu numerals: position-based and including 0