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What’s the difference between \mathrm and \operatorname?

I am a beginner of latex, and am always having a hard time differentiate these commands since they seem always produce the same result in math mode. So I am wondering what is the difference between them?

marked as duplicate by Qrrbrbirlbel, Guido, Werner, Mensch, egreg Jan 1 '13 at 10:07

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    No, they don’t. \text picks up the text-font settings outside of the math-mode it is used in. Everything else: What's the difference between \mathrm and \operatorname? – Qrrbrbirlbel Jan 1 '13 at 6:54
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    Besides that, \mathrm (and \text) do not understand the concept of limits (\limits/\nolimits). Further Reference: Is there a preference of when to use \text and \mathrm? – Qrrbrbirlbel Jan 1 '13 at 7:05
  • As suggested by @Qrrbrbirlbel the first sentence of your question isn't correct. Please consider correcting it because it may give the wrong impression to starting users. – user10274 Jan 1 '13 at 7:29
  • @marc sentencing changed! – minimax Jan 1 '13 at 7:55
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