# What is written on this photo? [closed]

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 EldredgeSep 8 '12 at 1:00

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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