7.2.4.2 poly expressions (plural)

A polynomial expression is (optional parts in square brackets):

1. a monomial (there are NO spaces allowed inside a monomial)

   [coefficient] ring_variable [exponent] [ring_variable [exponent] ...]

   monomials which contain an indexed ring variable must be built from ring_variable and coefficient with the operations * and ^
2. an identifier of type poly
3. a function returning poly
4. polynomial expressions combined by the arithmetic operations +, -, *, /, or ^.
5. a type cast to poly

Example: