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Mathematica HowTo
How to | Change the Form of Input and Output
The user interface for Mathematica provides many options for formatting input and output.
The sum of from n=1 to n=infty is :
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Out[1]=
While correct, this does not look like traditional mathematics. Select the cell group, then choose the menu item Cell ► Convert To ► TraditionalForm:
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Out[2]=
Alternatively, if you want to automatically format the answer, apply TraditionalForm:
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Out[3]//TraditionalForm=
    
InputForm and StandardForm work in reverse.
Use InputForm to find out how to type an expression into Mathematica:
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Out[4]//InputForm=
StandardForm is more compact than InputForm and is unambiguous to Mathematica:
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Out[5]//StandardForm=
TraditionalForm is sometimes ambiguous; in this case Mathematica treats f first as a number and then as a function:
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Out[6]//StandardForm=
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