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1.10.6 Subscripts, Bars and Other Modifiers
Here is a typical palette of modifiers.
Mathematica allows you to use any expression as a subscript.
In[1]:= 
Out[1]= 
Unless you specifically tell it otherwise, Mathematica will interpret a superscript as a power.
In[2]:= 
Out[2]= 
Special input forms based on control characters. The second forms given should work on any keyboard.
This enters a subscript using control keys.
In[3]:= Expand[(1 + x  _ 1+n )^4]
Out[3]= 
Just as ^ and _ go to superscript and subscript positions, so also & and = can be used to go to positions directly above and below. With the layout of a standard English-language keyboard & is directly to the right of ^ while = is directly to the right of _.
Ways to enter some common modifiers using control keys.
Here is  .
In[4]:= x &_ 
Out[4]= 
You can use  as a variable.
In[5]:= Solve[a^2 == %, a]
Out[5]= 
Ways to enter modifiers without control keys. All these forms can be used only inside \!\( ... \).
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