Head
 Usage
• Head[expr] 给出expr的头。
Notes
 Further Examples
Here are the heads of various numbers in Mathematica.
In[1]:=
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Out[1]=
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Looking at the heads of these expressions gives some insight into their internal representation. For the whole story, use FullForm.
In[2]:=
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Out[2]=
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In[3]:=
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Out[3]=
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; 
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