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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31. A good way to remember days of the month is this mnemonic  rhyme: 30 days hath September, April, June and November, all the  rest have 31, except February alone, and th â¦ at has 28 days clear and  29 in a leap year.. 3 people found this useful.Don Dfoofnik.1,118,693 Contributions.ow many more days till 1st day of summer? The first day of summer is June 21st and as of today there are 112 days until the first day of summer.