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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30 days has September, April, June and November. All the rest have 31 Except February alone, Which has 28 days clear And 29 in each leap year. Or you can use the knuckle method: A knuckle is 31 days, and in between each knuckle it isn't.