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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Today'sDate365 is a day calendar which allows you to view the current date quickly and for free. The date is an indication of time defining a single day. The Gregorian calendar used by most countries cut the year in 12 months, 365 days (366 in leap year) and 28, 30 or 31 days per month (29 in leap year).