TAG di Manoscritti Washington (D.C.) Library of Congress Manuscripts, Arabic digital collection World Digital Library Ma?m?d al-Im?m Man??r? Early works to 1800 Mathematics, Arab Astronomy, Arab Arithmetic early works to 1900 A?mad ibn Mu?ammad Ibn al-H??im ibn al-h??im, a?mad ibn mu?ammad Badr al-D?n Mu?ammad ibn Mu?ammad Sib? al-M?rid?n? Algebra ??h? Y?suf