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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When local standard time was about to reach. Sunday, April 5, 2015, 2:00:00 AM clocks were turned forward 1 hour to. Sunday, April 5, 2015, 3:00:00 AM local daylight time instead. Sunrise and sunset was about 1 hour later on Apr 5, 2015 than the day before. There was more light in the evening. Also called Spring Forward, summer time, and Daylight Savings Time.