Plane tree
= Plane tree
A <tree> together with an embedding in an oriented plane, considered up to deformation preserving the cyclic order of incident edges. For a rooted plane tree, the embedding orders the children of each vertex.
= Plane tree
A <tree> together with an embedding in an oriented plane, considered up to deformation preserving the cyclic order of incident edges. For a rooted plane tree, the embedding orders the children of each vertex.