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I've seen this photo in many websites but I couldn't figure out what is the meaning of it. It looks it might in involve fisher information and those sigmas might represent uncertainties.

What do you think?


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closed as too localized by William, rschwieb, Steve D, Pedro Tamaroff, Nate Eldredge Sep 8 '12 at 1:00

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

It looks like something to do with maximum likelihood estimation of a parameter in a Gaussian distribution, with mean $a$ and variance $\sigma^2$. Not sure exactly what though... –  Clive Newstead Sep 7 '12 at 18:09
Are you asking what is the subject of these equations or you asking what are those symbols in mathematics? –  Sigur Sep 7 '12 at 18:15
i guess both for example is that T some kind of operator? –  user39714 Sep 7 '12 at 18:25
It seems that $\mathrm{M}T$ denotes the expectation of $T$; this notation is very common in Russia but I've never seen it in modern math literature in English... –  Yury Sep 7 '12 at 21:10
I don't think this question is too localised as is evidenced by 7 upvotes. Just because one is not interested in the question does not mean it is so for others. Please don't close this thread. –  Makoto Kato Sep 8 '12 at 1:32