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Steiner tree

by Natasha1
Tags: steiner, tree
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Natasha1
#1
Apr24-06, 10:40 AM
P: 269
I just stumbled across this earlier and cannot understand it...

For example, every Steiner point will have degree exactly three in a minimum Steiner tree, and the angles formed between any two of these edges will be exactly 120 degrees.

What does 'will have degree exactly three' mean here?

Thanks
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