By the help of God and with His precious assistance, I say that Algebra is a scientific art. The objects with which it deals are absolute numbers and measurable quantities which, though themselves unknown, are related to "things" which are known, whereby the determination of the unknown quantities is possible.
Omar KhayyamAlgebras (jabbre and maqabeleh) are geometric facts which are proved by propositions five and six of Book two of Elements.
Omar KhayyamOld Khayyรกm, say you, is a debauchee;If only you were half so good as he!He sins no sins but gentle drunkenness,Great-hearted mirth, and kind adultery.But yours the cold heart, and the murderous tongue,The wintry soul that hates to hear a song,The close-shut fist, the mean and measuring eye,And all the little poisoned ways of wrong.
Omar Khayyam