Autores:
  • Whoever thinks algebra is a trick in obtaining unknowns has thought it in vain. No attention should be paid to the fact that algebra and geometry are different in appearance. Algebras (jabbre and maqabeleh) are geometric facts which are proved by propositions five and six of Book two of Elements.

    As quoted in "A Paper of Omar Khayyam" by A.R. Amir-Moez in "Scripta Mathematica", 26, 1963.