.initOps                Initialize operators
can.operator            can.operator
fun2name                Convert between a function and its name and
                        vice versa.
inverse                 Invert an R operator
is.operator             Utilities for operators
notin                   NOT IN
operator.type           Return the type for an operator.
operators               Return the _names_ of defined operators.
rel.type                Get the relational type of a relational
                        operator.
removeOperator          Unregister a an operator.
setOperator             Registers an operator for use with
                        operator.tools package.
