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 hath September, April, June and November, All the rest have 31, Excepting February alone. Which only has but 28 days clear And 29 in each leap year. 30 days hath September, April, June and November, All the rest have 31, Excepting February alone. Which only has but 28 days clear And 29 in each leap year.