Ash (1998) includes the following areas in his definition of abstract algebra: logic and foundations, counting, elementary number theory, informal set theory, linear algebra, and the theory of linear operators.
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The Ten Days of Repentance (Hebrew: ×¢×©×¨×ª ××× ×ª×©××× â, Aseret Yemei Teshuva) are the first ten days of the Hebrew month of Tishrei, usually sometime in the month of September, beginning with the Jewish holiday of Rosh Hashanah and ending with the conclusion of Yom Kippur