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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365 days a calendar at hand! (Week 41). This website shows every (annual) calendar including 2015, 2016 and 2017. This can be very useful if you are looking for a specific date (When there's a holiday / vacation for example) or maybe you want to know what the week number of a date in 2016 is.65 days a calendar at hand! (Week 41). This website shows every (annual) calendar including 2015, 2016 and 2017. This can be very useful if you are looking for a specific date (When there's a holiday / vacation for example) or maybe you want to know what the week number of a date in 2016 is.