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* '''[[Adjacency matrix]]''' - there is an N by N matrix, where N is the number of vertices in the graph. If there is an edge from some vertex x to some ve * The [[Erdős-Faber-Lovász conjecture]] (unsolved)

..., and its results. Although the questions are diverse and never-ending, a number of recurrent themes can be recognized: ...unit square was incommensurable with its (unit-length) edge: There was no number that represented how much longer the diagonal was than an edge. This caused

..., and its results. Although the questions are diverse and never-ending, a number of recurrent themes can be recognized: ...unit square was incommensurable with its (unit-length) edge: There was no number that represented how much longer the diagonal was than an edge. This caused