David W. Lambert <[email protected]> added the comment:
Mathematica indicates for the user to define it later. An error.
In[3]:= Permutations[{1,2},{-2}]
Permutations::nninfseq:
Position 2 of Permutations[{1, 2}, {-2}]
must be All, Infinity, a non-negative integer, or a List whose
first
element (required) is a non-negative integer, second element
(optional)
is a non-negative integer or Infinity, and third element (optional)
is a
nonzero integer.
Out[4]= Permutations[{1, 2}, {-2}]
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<http://bugs.python.org/issue4816>
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