When I open a new Mathematica session, the symbol x
doesn't appear in the list of symbols in the Global
context.
Now I run the following command in this notebook:
Manipulate[x, {x, 1, 2, 1}]
and now x
indeed appears in the list of symbols:
Names["Global`*"]
as one can check:
MemberQ[ Names["Global`*"] , "x" ]
(* True *)
And together with x
the symbol x$$
appears there too.
Why is that? What is this x
with the double dollar sign? Should I be worried about these two x
s?
EDIT:
Table[t, {t, 0, 2}]
adds t
into the Global
symbols list, too. But t$$
is not there, for some reason.