Glossary
abscissa the first coordinate of a point in the Cartesian plane
arithmetic progression a sequence in which the difference between ad-
jacent entries is always the same
closed interval a set of reals of the form {t : a < t 5 b} denoted by [a, b]
closed unit disc the set {z : IzI 5 1) in the complex plane
composite not prime
coprime with greatest common divisor 1
dilatation central similarity, homothety; a transformation which reduces
the scale about a fixed center
even function a function f satisfying f(-x) = f(x)
factored written as a product
fraction in lowest terms fraction for which the numerator and denom-
inator are coprime
geometric progression a sequence in which the ratio of adjacent entries
is always the same
harmonic progression a sequence of numbers whose reciprocals form an
arithmetic progression
identity equation valid for all values of the variable
iff if and only if
locus of an equation: the set of points in the plane or more generally in
n-dimensional space whose coordinates satisfy the equation
lower bound of a set of numbers: a number which does not exceed any
number in the set
negative strictly less than 0
nonnegative greater than or equal to 0
nonpositive less than or equal to 0