How do vertices of a graph form a ring

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An article by I. Beck, JOURNAL OF ALGEBRA 116, 208-226(1988) considers all the elements of the ring are vertices of the graph. How do we prove that the vertices of the graph/graphs form a ring? What are the additive and multiplicative operations here? Can a set of the vertices of arbitrarily different graphs also form ring or semiring? Edit: the statements of the above cited article goes like this, ' Let $R$ be a commutative ring. We consider $R$ as a simple graph whose vertices are the elements of $R$...

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The second paragraph of the paper states:

Let $R$ be a commutative ring. We consider $R$ as a simple graph whose vertices are the elements of $R$, such that two different elements $x$ and $y$ are adjacent iff $xy = 0$.

You ask, "How do we prove that the vertices of the graph/graphs form a ring?" The vertices of the graph do not form a ring; they are merely vertices. The author is not claiming that graphs can be turned into rings; he is starting with a ring and constructing a graph based on its properties.