例文
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- However, there exist linklessly embeddable graphs that are not apex graphs.
- Robertson's apex graph is shown in the figure.
- However, Neil Robertson provided an example of an apex graph that is not Y?Y-reducible.
- The null graph is also counted as an apex graph even though it has no vertex to remove.
- Because the rhombic dodecahedron's graph is planar, Robertson's graph is an apex graph.