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What does a ramification point mean in combinatorics? Is it the same as a branching point?

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I don't know about combinatorics, but in geometry, ramification/branching is defined with respect to a map $f : X \to Y$; a ramification point is a certain kind of point in $X$, and a branch point is by definition the image in $Y$ of a ramification point under $f$. –  Zhen Lin Mar 12 '13 at 13:41
    
Where did you see the word "ramification" being used in combinatorics? –  Qiaochu Yuan Mar 13 '13 at 2:07

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