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I am struggling with the question: Is it possible to have a graph in which a single node represents a group of similar objects? For example, if we have two sets X and Y of multiple objects, and a relation R between X and Y, can X and Y be represented as two nodes of a graph with R being the edge joining them?

Thanks for your help !

Cheers

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    You can certainly draw that graph and say it represents your situation. Whether that is a _useful_ thing to do depends on what it is you're trying to achieve. – 2017-02-06
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    @HenningMakholm Thanks for your reply. I found that this idea is similar to granularity in graphs. – 2017-02-07

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