Erase saved Values ?

Questions
,
1

Hi,
in a Notebook, I defined some constants by numerical values. But I cannot erase that definition. Neither by opening a new Notebook, nor by using the command “Clear”. Does someone know how to do that?

2

What did you do exactly with Clear? This way works for me:

a = 1;
Clear[a]

Another way:

a = 1;
a =.

A more drastic Clear, that wipes out all symbols in the Global context:

Clear["Global`*"]
3

Perhaps you are troubled that the symbol a remains even after you use Clear on it:

    Names["Global`*"]
{}
    a = 1;
    Clear[a]
    Names["Global`*"]
{a}

In that case, you could use Remove instead of Clear:

    Remove[a]
    Names["Global`*"]
{}
4

Thank you very much, the “Remove” Command works very well. Have a nice day.