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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Daylight Savings Time, or DST, in 2016 begins on the second Sunday of March and ends on the first Sunday of November. In March, clocks are moved forward one hour from 2am standard time to 3am DST, and in November, clocks are moved back one hour from 2am DST to 1am standard time. The phrase spring forward, fall back is a helpful reminder of these time changes.