Maxima Function
remfunction (f_1, ..., f_n)
remfunction(all)
Unbinds the function definitions of the symbols f_1, ..., f_n.
The arguments may be the names of ordinary functions (created by := or define)
or macro functions (created by ::=).
remfunction (all) unbinds all function definitions.
remfunction quotes its arguments.
remfunction returns a list of the symbols for which the function definition was unbound.
false is returned in place of any symbol for which there is no function definition.