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How do you write this in LaTeX:

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Start here: How to look up a math symbol – Alan Munn Aug 5 '11 at 20:01

I suggest to google for "actuarial" symbols and, of course, "LaTeX". You will find lots of examples, e.g. Annuity or Angle Operation Symbol in LaTeX.

I solved that problem some years ago, if I only remembered the context. . .

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+1 for the lifecon package mentioned there. – mbork Aug 5 '11 at 23:15
@Keks: But how do you do it on sites like this? – annuitt Aug 6 '11 at 6:56
How do you do what? On which sites? Sorry, I do not understand the question. – Keks Dose Aug 6 '11 at 15:06

In the thread Actuarial & Annuity notation in LaTeX from text.comp.tex, Donald Arseneau provided the following \annu command:

  \vbox{\hrule height .2pt 
    \kern 1pt 
    \hbox{$\scriptstyle {#1}\kern 1pt$}% 
  \vrule width .2pt 

with the additional comment:

Tweak ".2pt" and "1pt" for appearance.

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But you cant do it on this site? – annuitt Aug 6 '11 at 6:56
@ annuitt Can't do what on this site? You now have two solutions to your problem on this site. (Or do you mean why LaTeX markup isn't converted on this site? If that's your question, it's because this site is mainly about the markup language (TeX/LaTeX) and having automatic conversion would defeat the purpose.) See this question Can we turn off math-tex for reasons. – Alan Munn Aug 6 '11 at 16:47

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