  This paper gives additional background in algebraic geometry as an
accompaniment to the article, ``Formal Groups, Elliptic Curves, and some
Theorems of Couveignes'' [arXiv:math.NT/9708215]. Section 1 discusses the
addition law on elliptic curves, and Sections 2 and 3 explain about function
fields, uniformizers, and power series expansions with respect to a
uniformizer.
