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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It doesnât have to be that way: You should have peace of mind to enjoy springtime. This year, the individual 2015 tax return deadline is April 18, 2016 (April 19, 2016 if you live in Maine or Massachusetts), and a six-month extension is available until Oct. 17, 2016. Six-month extension of time to file.