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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Four and a few days. Since each week has 7 days but a month has 28 (February), 30 (April, June, September and November) and 31 (January, March, May, July, August, October and December) days. Even the whole year has 365 days that is 52 weeks and a day. A leap year has one more day, so 52 weeks and 2 days.