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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Posted. Day 20-35 everytime in sandbox, then 20 days and winter again. I wish spring was 20, summer was 20, No Fall, and then winter 20. The game could start in summer, but I hate winter coming again so soon after the first.