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Old May 18 2013, 09:39 PM   #49
Kommander
Commodore
 
Location: Detroit
Re: Capitalisation of I

The personal pronoun I is capitalized to differentiate from the math symbol i.[citation needed]

Back when the Rules of Etiquette were established, it was considered socially unacceptable to refer to oneself as being a number or imaginary, rude to refer to oneself as the square root of anything, and extremely rude to refer to oneself as the square root of a negative number. Also, people were offended by math in general back then.
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