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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Other months have thirty-one days. And sometimes February has twenty-eight days and sometimes it has twenty-nine! If you want to remember how many days each month has, memorize the poem below. MonthsThirty days has September,April, June, and November.All the rest have thirty-one,Except February,Which has twenty-eight (most of the time),But in a Leap Year has 29. Super Teacher Worksheets-www.superteacherworksheets.com.