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math.CO2017
Locally finite trees and the topological minor relation
Jorge Bruno, Paul J. Szeptycki
A well-known theorem of Nash-Williams shows that the collection of locally finite trees under the topological minor relation results in a BQO. Set theoretically, two very natural q…
math.CO2016
A family of many topological types of locally finite trees
J. Bruno
Two rooted locally finite trees are considered equivalent if both can be embedded into each other as topological minors by means of tree-order preserving mappings. By exploiting Na…