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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Purchasing Spring Festival Couplets. The Chinese New Year, or Spring Festival as it is sometimes called, is a 15-day festival in traditional custom. It can be generally divided into three periods, the days preceding the festival, the festival days and the days after the Spring Festival Day.