This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)

BlankSequence (__)

__ (two _ characters) or BlankSequence[]
is a pattern object that can stand for any sequence of one or more Mathematica expressions.
__h or BlankSequence[h]
can stand for any sequence of one or more expressions, all of which have head h.
A function definition that works with any nonzero number of arguments:
A function definition that works with any nonzero number of real arguments:
A function definition for a symbol followed by any nonzero number of integer arguments:
A function definition that works with any nonzero number of arguments:
In[1]:=
Click for copyable input
In[2]:=
Click for copyable input
Out[2]=
 
A function definition that works with any nonzero number of real arguments:
In[1]:=
Click for copyable input
In[2]:=
Click for copyable input
Out[2]=
 
A function definition for a symbol followed by any nonzero number of integer arguments:
In[1]:=
Click for copyable input
In[2]:=
Click for copyable input
Out[2]=
New in 1