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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Weeks and Weeks of Flowers. As the name Daylily suggests, individual Daylily blossoms last only a day, but a given plant produces new flowering stems over some weeks, and if early bloomers are matched with midseason and late Daylilies, as in our Unique 50  mix, the result is a summer of unceasing bloom.