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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The Gregorian calendar consists of the following 12 months: January - 31 days. February - 28 days in a common year and 29 days in leap years. March - 31 days. April - 30 days. May - 31 days. June - 30 days. July - 31 days.