Abraham Lincoln | Abraham | F. Murray Abraham | Battle of the Plains of Abraham | Abraham Ortelius | Abraham Maslow | Erich Kästner | Arthur Abraham | Abraham Laboriel | Abraham Joshua Heschel | Abraham ben David | Spencer Abraham | Abraham ibn Ezra | Plains of Abraham | John Abraham | Abraham Zapruder | Abraham Lincoln (1920 statue) | Abraham Darby | Stephen Abraham | John Abraham (actor) | Abraham Foxman | Abraham Flexner | Abraham Clark | Abraham Chasanow | Abraham Buford | Abraham Beame | Samuel Abraham | Ralph Abraham | Malouf Abraham, Sr. | Lynne Abraham |
On 23 October 1791 Bartels studied mathematics under Johann Friedrich Pfaff in Helmstedt and Abraham Gotthelf Kästner in Göttingen.