## Rank numbers for bent ladders.(English)Zbl 1290.05127

Summary: A ranking on a graph is an assignment of positive integers to its vertices such that any path between two vertices with the same label contains a vertex with a larger label. The rank number of a graph is the fewest number of labels that can be used in a ranking. The rank number of a graph is known for many families, including the ladder graph $$P_{2}\times P_{n}$$. We consider how “bending” a ladder affects the rank number. We prove that in certain cases the rank number does not change, and in others the rank number differs by only 1. We investigate the rank number of a ladder with an arbitrary number of bends.

### MSC:

 05C78 Graph labelling (graceful graphs, bandwidth, etc.) 05C15 Coloring of graphs and hypergraphs 05C76 Graph operations (line graphs, products, etc.)
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### References:

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