{\bf{Remarks on Problem Sets}}

As well as lecturing, I set aside large blocks
of time in class for the students to work on
problems from the problem sets listed here.
Most of the exercises are from the textbook. In
the earlier sets, when we were reviewing
material familiar to many of the students, it
was necessary to supplemement these with 
some more challenging/unusual exercises for
the  students with better backgrounds. Later,
when we moved to less familiar 
material (quadratic reciprocity, elliptic
curves etc) there was sufficent range in
diversity and difficulty of  exercises in the
book for all students.  
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