In presenting these problems, Chung and Graham include exposition of the background needed to understand them, summarising earlier work by Erdös and others. Footnotes give references into the mathematical literature for those who want the full details. And some lighter reading is provided by a preface introducing Erdös and an afterword by Andrew Vázsonyi with twenty pages of "Erdös stories" (and a brief foray into projective geometry).
The mathematics is fairly dense, but the dependencies between results are not deep and a superficial grasp of a section won't prevent further reading. Graph theory also lends itself to relatively easy visualisation, and the only essential background is a good grasp of combinatorics and basic number theory and algebra. Erdös on Graphs should be within the reach of talented undergraduates.
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