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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If you include the end date of Apr 1, 2015 which is a Wednesday, then there would be 65 weekdays and 26 weekend days including both the starting Thursday and the ending Wednesday. 90 days is equal to 12 weeks and 6 days. The total time span from 2015-01-01 to 2015-04-01 is 2,160 hours.