# ** -- a binary operator, usually used for tensor product or Cartesian product

• ^** -- a binary operator, usually used for tensor or Cartesian power

## For the programmer

The object ** is .

This operator may be used as a binary operator in an expression like x**y. The user may install binary methods for handling such expressions with code such as

         X ** Y := (x,y) -> ...

where X is the class of x and Y is the class of y.