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I am writing my thesis on latex but I do not know how to write Itô's in latex with the symbol on the 'o' . Could someone tell me how can I do it? Do I need a special package?

Stefán Valdimarsson
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user3503589
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    ito, what do you mean??? – David Carlisle Feb 13 '16 at 16:04
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    You mean the ô as in Itô? – sodd Feb 13 '16 at 16:04
  • yes thats exactly what I mean. How did you do it? – user3503589 Feb 13 '16 at 16:06
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    how could anyone guess that's what you meant from the question? there are thousands of uses of ô and Itô (or ito) isn't a word anyone reading in english is likely to recognise!!! you can use \^{o} or simply type ô if you have specified \usepackage[utf8]{inputenc} – David Carlisle Feb 13 '16 at 16:09
  • @DavidCarlisle my bad, I thought it was quite obvious. I will be careful next time – user3503589 Feb 13 '16 at 16:13
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    it's completely unclear to me how hooy managed to answer even now. I have no idea what ito or Itô mean so there was no hint in the question that you needed ô it could have been º or ó or anything that you were looking for:-) – David Carlisle Feb 13 '16 at 16:18
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    Just so you know, that symbol is usually called a circumflex. At least, it is when it's used in words, names, etc. Mathematicians may simply call it a hat or a roof, when it is used as part of a mathematical symbol, such as the unit vector î – Au101 Feb 13 '16 at 16:22
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    @DavidCarlisle probably a Thesis in mathematical finance or at least stochastic processes. –  Feb 13 '16 at 16:25
  • @DavidCarlisle I totally understand. It^{o} is a very famous guy and is known to everybody in my circle so I was careless. My apologies, I should have been more precise. I won't make the same mistake again. – user3503589 Feb 13 '16 at 16:33
  • no harm done, actually I have been to lectures on Itô's work (but clearly didn't have a lasting impression on me:-) – David Carlisle Feb 13 '16 at 16:38
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    @NajibIdrissi: Assuming that this is a reference to the late mathematician Kiyosi Itô, it seems he wrote his name in an unusual way. Wikipedia suggests that although standard romanization would call for a macron, the man himself specifically preferred it to be written with a circumflex, in accordance with a different romanization system. – Nate Eldredge Feb 13 '16 at 17:55
  • @NateEldredge I see. Well, in any case it's a duplicate (cf. my previous comment). – Najib Idrissi Feb 13 '16 at 17:57
  • @DavidCarlisle, something like dB^2=dt, in some way you get a square root of infinitesimal time increment. Now called stochastic differential equations. Useful to get a high paid job at running Monte Carlo simulations and for programming micro-second trading (or is it nanosecond now ?), with the result of making the people/institutions who have the (now numeric) info and the (soon numeric) money richer every day. –  Feb 13 '16 at 18:09

1 Answers1

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You can make the ô character with \^{o}:

\documentclass[border=10pt]{standalone}
\begin{document}
It\^{o}
\end{document}

Or you can load inputenc package with utf8 option and give the character as a unicode character:

\documentclass[border=10pt]{standalone}
\usepackage[utf8]{inputenc}
\begin{document}
Itô
\end{document}

Output

sodd
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    @NajibIdrissi It depends who's transliterating. To quote wikipedia "Although the standard Hepburn romanization of his name is Itō, he used the spelling Itô (Kunrei-shiki romanization). The alternative spellings Itoh and Ito are also sometimes seen in the West." Which just about says it all. The spelling is really up to the individual, in the way that some Russians prefer traditional -ff to modern -v, e.g. Poliakoff/Polyakov. But yeah across languages macrons are more common for long vowels now, but the circumflex was often used for long vowels in the past, e.g. Sanskrit Kâlidâsa, now Kālidāsa – Au101 Feb 13 '16 at 17:54
  • @NajibIdrissi I just used the same spelling as Kyoto University's page about Kiyosi Itô. – sodd Feb 13 '16 at 17:57