epagomenic

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• epagomenic — Days which are omitted from a calendar, either in ancient times or with modern obscure holidays …   Grandiloquent dictionary

• Omar Khayyam — (c. 1048–c. 1122) Persian astronomer, mathematician, and poet Omar Khayyam, who was born at Nishapur (now in Iran), produced a work on algebra that was used as a textbook in Persia until this century. He gave a rule for solving quadratic… …   Scientists