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I couldn't figure out the command for Capital Nu as shown in the picture. I tried \Nu but it doesn't work.enter image description here

I googled but found nothing helpful.

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  • 3
    It's not a capital nu… because this is a capital: N. It is probably a large-size lowercase nu or a math calligraphic V.
    – Bernard
    Mar 13, 2015 at 2:52
  • Could you show me the latex commands? Because I am new to LaTeX and don't understand a bunch of words you just use.
    – TBBT
    Mar 13, 2015 at 2:54
  • math calligraphic means try this: \mathcal{V}
    – Sohail Si
    May 11, 2018 at 20:02

2 Answers 2

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Some Greek capital letters look the same as Latin capitals and therefore don't have unique commands. Nu is one of them. The list of these Greek capitals is available from several sources, including

http://www.mathworks.com/matlabcentral/answers/14751-greek-alphabet-and-latex-commands-not-a-question and https://tex.stackexchange.com/a/49602/61108

From the linked TeX.SX answer the list is

Α α alpha
Β β beta
Ε ε epsilon
Ζ ζ zeta
Η η eta
Ι ι iota
Κ κ kappa
Μ μ mu
Ν ν nu
Ο ο omicron
Ρ ρ rho
Τ τ tau
Υ υ upsilon
Χ χ chi

Just use N for capital nu.

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  • Thank you. Let suppose that I want to enlarge $\nu$, what command should I use?
    – TBBT
    Mar 13, 2015 at 3:12
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    $\tilde{\mathcal{V}}$
    – onewhaleid
    Mar 13, 2015 at 3:15
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    I think my question is miss leading. I should be asking what is the command for Script V?
    – TBBT
    Mar 13, 2015 at 3:18
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It is certainly a math calligraphic V. Here is the formula, reproduced as faithfully as possible:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\newcommand\I{\mathrm i}
\newcommand\E{\mathrm e}

\begin{document}

\begin{alignat*}{2}
& \widetilde{\mathcal{V}} &{} = -\hbar \Omega \Bigl\{ &\sigma_ + \E^{-\I(\Delta t-\varphi)}\bigl[1 + \I\eta(b\E^{-\I\nu t} + b^{\dagger}\E^{\I\nu t})\bigr]\Bigr. \\
  & & \Bigl. {}+{} &\sigma_ -\E^{\I(\Delta t-\varphi)}\bigl[1 - \I\eta(b\E^{-\I\nu t} + b^{\dagger}\E^{\I\nu t})\bigr]\Bigr\}. 
 \end{alignat*}%

\end{document} 

enter image description here

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    ...and $\tilde{\mathcal{V}}$ would give you the tilde above the V
    – onewhaleid
    Mar 13, 2015 at 3:25
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    Yes, I've just seen (and corrected) that.
    – Bernard
    Mar 13, 2015 at 3:27
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    Your \widetilde looks better. Interestingly the original seems to have just used a narrow tilde though.
    – onewhaleid
    Mar 13, 2015 at 3:29
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    Many people think \widetilde is for a group of several letters, but actually it is better, in my opinion, for single wide letters (m or capital letters).
    – Bernard
    Mar 13, 2015 at 3:32

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