I am interested in studying one of the mathematical compositions of the Ibn Ezra. Is anyone familiar with the easiest book that he wrote? Thanks
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Wikipedia lists the mathematical works as:
Sefer ha-Ekhad, on the peculiarities of the numbers 1–9. 77 pages.
Sefer ha-Mispar or Yesod Mispar, arithmetic. 218 pages. This sefer is also available with a German translation.
Luchot, astronomical tables.
Sefer ha-Ibbur, on the calendar (ed. Halberstam, 1874).
Keli ha-Nechoshet, on the astrolabe (ed. Edelmann, 1845).
Shalosh She'elot, in answer to three chronological questions of David Narboni.
I am not familiar with the easiest one. You may choose Sefer ha-Ekhad because it is only 77 pages or Sefer ha-Mispar because it has been translated into German.