### 4.6.9 Unassigning variables

The VARS() command will list the variables to which you have
assigned values or assumptions. If you begin by entering

a := 1

and

anothervar := 2

then

VARS()

will return

[a, anothervar]

The purge command will clear the values and
assumptions you make on variables. You can clear the values and
assumptions you have made on all variables with

or

command.