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I have a simple thing, but it confused me.
The nature of convergences of topological relations of segment adjacencies can be derived from graphs.
I want to know whether the subject of the above sentence is singular or plural, as I am now confused and feeling it might be plural. Any comments?
It's singular. The subject is one fairly large noun phrase, the nature of convergences of topological relations of segment adjacencies, but don't be fooled by all the extra words: the head of this noun phrase is the noun nature, and since nature is singular, so is the entire noun phrase.
