A structure H will be a substructure of a series-parallel construct if and only if all of these things for H do not include the wheel designated by W-sub-four.
A structure H will be a substructure of a series-parallel construct if and only if all of these things for H do not include the wheel designated by W-sub-four. Tutte hypothesized that a structure K with the bridgeless property will have a nowhere zero four-畔low if its underlying Petersen family is not one of these things for K. A theorem by Tutte states that every mathematical snark will have a Petersen graph as one of these things. Graphs have the property that they are well-quasi-ordered with respect to the embedding of these constructs according to the Robertson-Seymour theorem. Wagner's theorem, and not Kuratowski's theorem, states that a graph is planar if and only if the original graph and all of these constructs do not include K-sub-炬ve and K-sub-three-three. For 10 points, name these structures which are formed by contracting and deleting edges of a source graph.
A structure H will be a substructure of a series-parallel construct if and only if all of these things for H do not include the wheel designated by W-sub-four.
graph minor [do not accept or prompt on "graph" or "subgraph"]