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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Daylilies are grown for their flowers in a rainbow of colors, and many shapes and sizes. There are daylilies in bloom from late spring until autumn. Individual flowers last only one day but since each plant produces many buds, the total blooming time of a well-established clump may be 30 to 40 days. Many varieties have more than one flowering period. 'Stella de Oro' is one of the best known reblooming daylilies.