False position method ibn Luqa (10th century), an Arab mathematician from Baalbek, Lebanon. He justified the technique by a formal, Euclidean-style geometric proof. Within the tradition of medieval Muslim mathematics, double false position was known as "hisāb al-khaṭāʾayn" ("reckoning by two errors"). It was used for centuries to solve practical problems such as commercial and juridical questions (estate partitions according to rules of Quranic inheritance), as well as purely recreational problems. The algorithm was often memorized with the aid of mnemonics, such as a verse attributed to Ibn al-Yasamin and balance-scale diagrams explained by al-Hassar and Ibn al-Banna, all three being mathematicians of
Midfielder attack. The holding midfielder may also have responsibilities when their team has the ball. This player will make mostly short and simple passes to more attacking members of their team but may try some more difficult passes depending on the team's strategy. Marcelo Bielsa is considered as a pioneer for the use of a holding midfielder in defence. This position may be seen in the 4–2–3–1 and 4–4–2 diamond formations. Initially, a defensive midfielder, or "destroyer", and a playmaker, or "creator", were often fielded alongside each other as a team's two holding central midfielders. The destroyer was usually responsible for