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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With a mnemonic word play referring to seasons, clocks spring forward, fall backâthat is, in springtime the clocks are moved forward from 2:00 a.m. to 3:00 a.m., and in fall they are moved back from 2:00 a.m. to 1:00 a.m. Daylight saving time lasts for a total of 34 weeks (238 days) every year, about 65% of the entire year (including leap years).