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Question on pattern matching


Hi,

I am a very newbie in Mathematica so sorry for possibly stupid question.

In the following Mathematica's output
In[1]:= SetAttributes[k, Orderless]
In[2]:= k[a, b, b] /. k[x_, x_, y_] -> 0
Out[2]= 0
In[3]:= k[a, b, b] /. k_[x_, x_, y_] -> 0
Out[3]= k[a, b, b]

I can't understand why Mathematica can find match when applying pattern 
k[x_, x_, y_], but is unable with more general pattern k_[x_, x_, y_].

Thanks in advance.

---

R. Green



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