[seqfan] Re: Hetero-labeled trees

[Eric Angelini]

Thank you Franklin -- yes, "weights" is the right word.
I'll correct in a minute. 
Best,
É.
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[FAW]:
 (...)
> It is IMO better to describe these as "weights" rather than "labels". 
So what you are defining are "hetero-weighted trees", the requirement 
is that each node has a distinct positive integer weight, and the 
weight of any non-leaf node is the sum of the weights of its children.