Function: remvalue (<name_1>, ..., <name_n>)
Function: remvalue (all) Removes the values of user variables <name_1>, ..., <name_n> (which can be subscripted) from the system.
remvalue (all) removes the values of all variables in
values, the list of all variables given names by the user (as opposed to those which are automatically assigned by Maxima).
(%o1) true (%i2)