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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Both traditional and some year-round school calendars can have 180 days of instruction. The traditional calendar, of course, is divided into nine months of instruction and three months of vacation during the summer. Year-round calendars break these long instructional/vacation blocks into shorter units.