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I was reading a powerpoint for one of my classes and came across this sentence:

It allows us to assert that exactly one of two propositions is true

When I first read it, I thought that it should have said:

It allows us to assert that exactly one of two propositions are true

Since propositions is plural I would argue that are is the better fit in this sentence, but it is possible that is fits grammatically as well?

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We are asserting that only one proposition is true, not that both are.

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I think you are deconstructing the sentence a little too myopically.

The subject of the verb "is" is the phrase "exactly one of two propositions", which is singular.

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  • I've made a correction, please check to see that you agree.
    – James K
    Jan 16 '18 at 6:43

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