id -package:invertible package:numeric-prelude

Identity function.
id x = x
Abstract concept of a Monoid. Will be used in order to generate type classes for generic algebras. An algebra is a vector space that also is a monoid. Should we use the Monoid class from base library despite its unfortunate method name mappend?
Abstraction of normed vector spaces
Works always but simply puts the product into the last fraction.
Divide two series where the absolute term of the divisor is non-zero. That is, power series with leading non-zero terms are the units in the ring of power series. Knuth: Seminumerical algorithms
Divide two series also if the divisor has leading zeros.