Hello,

I do have a collection of trees (mind maps, actually) and want to formally describe this collection of trees.

My first question: how can I describe a tree? Are there any metrics to express how a tree looks like? Of course, it has a height and it might be balanced or not. But are there any other metrics (e.g. to say how balanced a tree is)?

The second question: How can I describe a collection of different trees. Do you know of any metrics that make sense? Of course I could calculate the mean height etc. but are there some more sophisticated metrics?

Best, Thomas