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I understand you can say either

I'm president of the United States.


I'm the president of the United States.

I also know of a rule that you may omit "the" in front of a title, position, etc.

Since the omission does not seem to depend on the style of the text, I'd like to know what is the reasoning behind such a usage and rule.

Is it because you tend to consider a title something like a proper noun?

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If "President" is used as a proper noun, the "P" should be capitalized, though. – SingerOfTheFall Dec 5 '12 at 7:55

When a predicative noun phrase names a unique role or job, either a zero article or the is used.

‘Longman Student Grammar of Spoken and Written English'

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I asked about the reasoning behind the rule, not the rule itself. And no one here seems to know any such reasoning or bother to think about it. – JK2 Dec 10 '12 at 6:33

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