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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New Year's Day falls on Jan.1, and people can have one day off. Spring Festival, the Chinese New Year's Day, falls on the eve of the Lunar New Year, and people can have three days off. The stretch of holidays is longer if weekends before and after are included. Tomb-Sweeping Day falls on April 5 or 6, and people can have one day off.