20

I came across this symbol (the one looks like 3) when I read a book this afternoon. I never saw such a symbol before. Is it a Greek letter? What is its LaTeX code?

enter image description here

  • 2
    Looks like the cyrillic zemlja (the equivalent of the Z for the Latin alphabet). – Bernard Jul 5 '17 at 23:44
  • 2
    Did you try detexify ? – Paul Gaborit Jul 5 '17 at 23:44
  • @PaulGaborit Yes, I did. Detexify doesn't give the right one. – jwyao Jul 5 '17 at 23:45
  • Context from the rest of the book? – ShreevatsaR Jul 5 '17 at 23:45
  • 5
    looks like a fraktur Z to me -- \frak{Z}. – barbara beeton Jul 6 '17 at 1:34
33

It is \mathfrak{Z} from the STIX font.

\documentclass{article}
\usepackage{amsmath}
\usepackage{stix}
\begin{document}

$\sqrt{n} ( \mathscr{K}_n - \mathscr{K} ) \xrightarrow{d} \mathfrak{Z}$

\end{document}

enter image description here

| improve this answer | |
19

this is almost certainly a fraktur Z --$\frak{Z}$.

while the letter does look quite like the cyrillic Ze, in western math there is a very long history of using the fraktur alphabet, but the only "common" cyrillic letter i know of that has made its way into western math is the Sha (first letter of the name shafarevich, and also used for the shuffle product).

| improve this answer | |
  • 1
    \frak_Z+ should be \frak{Z}, I presume. – Henri Menke Jul 6 '17 at 2:40
  • Also, why is there so little space between ) and \xrightarrow in my answer? – Henri Menke Jul 6 '17 at 2:42
  • @HenriMenke -- thanks for noticing typo -- fixed. (could have sworn i checked that, but machines here have been behaving unpredictably for the past week.) regarding bad spacing in your answer re stix font, there are still a lot of niceties that have to be sorted out there. i'll put that on our list. – barbara beeton Jul 6 '17 at 12:13
  • @HenriMenke -- on testing your example here, the bad positioning of the arrow is confirmed, but only with stix 1; stix 2 isn't yet fully available, but i will test this when it is. (so i have a different question -- how did whoever created the example shown in the original question get it right?) – barbara beeton Jul 6 '17 at 12:43
  • 1
    @StevenB.Segletes -- no need to sleuth, actually. i learned to read fraktur in my childhood. didn't learn to read cyrillic until i was in college. so for me, this was a no-brainer. – barbara beeton Jul 6 '17 at 13:30

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.