Abu l-Hasan Kūshyār ibn Labbān ibn Bashahrī al-Jīlī (Arabic: أبو الحسن كوشياربن لبّان بن باشهري الجيلي) (971–1029), also known as Kushyar ibn Labban, was an Iranian mathematician, geographer, and astronomer from Gilan, south of the Caspian Sea, Iran. Author of Principles of Hindu Reckoning.
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