| The Characteristic Polynomial of a Graph is Reconstructible from the Characteristic Polynomials of its Vertex-Deleted Subgraphs Recent countries visiting this post |  |
 | 6 | United States |
| The Characteristic Polynomial of a Graph is Reconstructible from the Characteristic Polynomials of its Vertex-Deleted Subgraphs Recent countries visiting this post | |
| 6 | United States |