What about Omar Khayyam?

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Omar Khayyam

According to many historians, Omar Khayyam was born shortly before the death of Sultan Mahmud. Omar Khayyam spent some of his childhood in Balkh, present-day Afghanistan. There he accepted the discipleship of Imam Moafefak Nishapuri, considered one of the best teachers of Khorasan. Teaching geometry and algebra during the day, consulting at Malik-Shahr Darbar in the evening and practicing astronomy at night, besides correcting the Jalali calendar, his devotion was never lacking. Omar’s reputation during his lifetime was as a mathematician. He first solved the trinomial equation using the intersection of the ellipse and the circle. Another major contribution of Omar was his critique of Euclid’s postulate of parallelism, which led to later non-Euclidean geometry. In 1070 AD, his book Maqalat fi al-Zarb al-Muqabila was published. In this book he classifies equations as exponents and prescribes rules for solving quadratic equations. Omar Khayyam was also known as an astronomer.