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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There is a common nursery rhyme used to teach children the days in the months. The first line reminds you how many months contain 30 days. The first line goes, 30 days have September, April, June, and November. You can remember, based off this line, that September, April, June, and November each have 30 days.