It would be helpful if there were a way to detect if a user defined symbol has been used before because often i want to kill certain symbols that i have used before because of the bugs in function definitions in Maxima and can't remember exactly what all i have defined prior and I don't want to have to kill(all) or restart maxima. And for example if i use command for i thru 5 kill(ket[i]) and it so happens that i have not yet defined the symbol it comes back with error when it should just ignore it and not give an error. Right now there is no way to get around this because for one the atom command also does not work as it should. As I put in command is(ket,atom) and instead of coming back as no if i have not yet defined it it comes back unknown.
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