Liber Algebræ et Almucabola

  • book about solving quadratic equations
  • principial mathematical text-book of European Universities until 16th century
  • al-ğabr ("forcing", "restoring") operation :: moving a deficient quantity from one side of the equation to the other side
  • al-Muqabala ("balancing" or "corresponding") operation :: subtraction of the same positive quantity from both sides
  • presented in ordinary text
    Al-kitāb al-mukhtaṣar fī ḥisāb al-ğabr wa’l-muqābala, The Compendious Book on Calculation by Completion and Balancing
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