I would like to say something like

"One of (the)important facts in mathematics is ABC theorem."

I am wondering if I need "the" or not. The reason I am confusing is that the importance of facts is personal and could be non-definitive.

So I guess I don't need "the". Please correct me if I am wrong.

  • 1
    One of the important theorems in mathematics is ABC.
    – Peter
    Dec 31, 2016 at 10:07
  • One of several of any noun (facts in your example) will always be countable (1) so an article is needed. important modifies facts only to say that "ABC theorem" is important. There is no general importance stated.
    – user3169
    Dec 31, 2016 at 20:39

1 Answer 1


I would say, "One of the most important theorems..."

...if you want to emphasize this theorem, or...

"One important theorem..." or "An important theorem..."

...if you do not need to emphasize this theorem.

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