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

See also

Ways to use symbol ** :

For the programmer

The object ** is a keyword.

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.