He should also suspect himself as he performs his critical examination of it so that he may avoid falling into either prejudice or leniency. And now another very famous poet, philosopher, mathematician, polymath of the time was Omar Khayyam. And in the West, he is most famous for his poetry, most famously the work of the Rubaiyat, the translation by Fitzgerald. But he was also a significant philosopher, mathematician. This is a picture of some of his work right over here. You can see that he did his work in the 11th and the 12th centuries. And he did it from Bukhara.