News What is the name for a scripted letter in a paper?

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The discussion centers on identifying a specific scripted letter in a mathematical paper, which appears in equation (3). Initially thought to be a scripted T, it is clarified that the letter is actually an I, denoting the imaginary part, represented by the LaTeX command \Im. The conversation highlights the challenges of rendering this correctly in MathJax and suggests using LaTeX for proper formatting. Various font styles in LaTeX are mentioned, including \mathbb{} for double lines, \mathcal{} for a handwritten look, and \mathfrak{} for Fraktur script. Resources for LaTeX symbols and character references are also provided to assist users in identifying and using different mathematical fonts.
Afonso Campos
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I was wondering if someone could help me figure out what a scripted letter in a paper I'm reading is called.

The scripted letter is in equation (3). It looks like some kind of a scripted T.

10335c10db.png
 
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Fightfish said:
It looks like a J in Fraktur script to me (i.e. the mathfrak command in LaTeX).
It is actually an I, representing the imaginary part, obtained using \Im:
$$
\Im \omega_0 \leq \pi T_\mathrm{BH}\, .
$$
 
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Arrrgg! MathJax doesn't render that with the right font. Here is how it will look in ##\LaTeX##:
image-493.jpg
 
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Afonso Campos said:
The scripted letter is in equation (3). It looks like some kind of a scripted T.
You can test it in the editor section: type something included in ##\textrm{## \mathfrak{something} ##}## and see what it looks like - ## \mathfrak{something} ## - by the editor function "preview".

Frequently used fonts are:
\mathbb{} for double lines as in ##\mathbb{R}##
\mathcal{} for a look similar to hand writing ##\mathcal{G}##
\mathfrak{} fraktura for "old" letters like in ##\mathfrak{su}(2)##

Here's an overview of LaTeX symbols: http://detexify.kirelabs.org/symbols.html
 
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DrClaude said:
It is actually an I, representing the imaginary part, obtained using \Im:
$$
\Im \omega_0 \leq \pi T_\mathrm{BH}\, .
$$

Makes sense! Thanks!
 
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