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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Bloom Time. Blooms appear for approximately one week in the late spring or early summer. Gardeners can extend the blooming season up to six weeks by selecting varieties that bloom early, midseason and late in the season. The large blossoms come in many colors except blue.