This is nothing but just a question about greek letters in the notation of III.1.9 in Jacod and Shirayeav (2003):

enter image description here

In here, what is the letter enter image description here? and how can I write in LaTeX?

It would be very appreciated if you let me know.


  • 5
    It is not a greek letter. Looks like a calligraphic lowercase s.
    – Bernard
    Commented May 13, 2021 at 17:58
  • Thank you very much! Commented May 13, 2021 at 18:33

2 Answers 2


Using pdfLaTeX with the package calligra:


$\mbox{{\calligra s}}\,(\mathscr{H},\mu\mid P_H,\nu)(abc)$

enter image description here


Like @Bernard said, its calligraphic lowercase s \mathscr{s}.

With TeX Gyre Schola Math font

$\mathscr{s}(\mathscr{H}, μ \big|\mathit{P_{H}}, ν)$

looks like this:


% !TEX TS-program = xelatex
% !TEX encoding = UTF-8 Unicode
\documentclass[12pt, a4paper]{article}
\setmainfont{TeX Gyre Heros}
\setmathfont{TeX Gyre Schola Math}


$\mathscr{s}(\mathscr{H}, μ \big|\mathit{P_{H}}, ν)$


Greeks letter can be set also with $\mu \nu$.

  • 4
    I think the last letter is \nu instead of v.
    – SebGlav
    Commented May 13, 2021 at 18:43
  • $v \nu$ (v and ν)
    – Oni
    Commented May 13, 2021 at 18:58
  • Yet, in OP's picture, if you have a close look, i really think it's a \nu, but one can choose what he wants ;)
    – SebGlav
    Commented May 13, 2021 at 19:00

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