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Assuming "Information retrieval" is an official term describing a research domain, should it be capitalized in the middle of a sentence? that is, what is/are the correct form/s:
If it's the name of a department or a company, then yes, both words need to be capitalized.
If not (i.e. if you're simply interested in information retrieval as a phenomenon - the act itself of retrieving information), neither needs to be capitalized.
