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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The spring equilux occurs about four days before the spring equinox, which means it occurred on March 17. According to the Pine River Observatory, an equilux is âthe day that has equal hours and minutes of sun above and below the horizon.â Happy spring!