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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âºâº Date difference from Jan 1, 2015 to Apr 1, 2015. The total number of days between Thursday, January 1st, 2015 and Wednesday, April 1st, 2015 is 90 days.