Date: May 18, 2012 5:27 AM
Author: André Hautot
Subject: clearing a variable with a dummy subscript


Hi !
Here is something very simple I don't understand :

f[x_] := x; f[2]    (*A function*)
 2

Clear[f]; f[2]       (*The same perfectly cleared as expected*)
f[2]


Subscript[u, k_] := k; Subscript[u, 2]        (*u with subscript k_ 
entered via the palette*)
 2

Clear[u]; Subscript[u, 2]          (*I found no way to clear u; a 
suggestion ?)
2

Thanks in advance,

ahautot