I'm searching for solution of euclidean minimum spanning tree if solution has create add-on-nodes between given data points which e.g. https://en.wikipedia.org/wiki/Euclidean_minimum_spanning_tree doesn't mention. these add-on-nodes would connect three edges at angles of 120 degres...
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Do you mean a Euclidian Steiner Tree?
Yes, exactly... thanks
I'd want online demo of it, but