I'm trying to denote the letter K that appear in notation Krylov Space
I've already tried to use \mathcal and \kappa but it's not the same.
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Sign up to join this communityIt's the standard \mathcal{K}
.
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\mathcal{K}(r_0;k)=\operatorname{span}\{r_0,Ar_0,\dots,A^kr_0\}
\]
\end{document}
I guess that your document uses mathptmx
. Do like this:
\documentclass{article}
\usepackage{amsmath}
\usepackage{mathptmx}
\DeclareMathAlphabet{\mathcal}{OMS}{cmsy}{m}{n}
\begin{document}
\[
\mathcal{K}(r_0;k)=\operatorname{span}\{r_0,Ar_0,\dots,A^kr_0\}
\]
\end{document}
If you're using newtx
, the code should be
\documentclass{article}
\usepackage{amsmath}
\usepackage{newtxtext,newtxmath}
\usepackage{fix-cm}
\DeclareMathAlphabet{\mathcal}{OMS}{cmsy}{m}{n}
\begin{document}
\[
\mathcal{K}(r_0;k)=\operatorname{span}\{r_0,Ar_0,\dots,A^kr_0\}
\]
\end{document}
looks a bit like kappa from txfonts
, just a bit bigger:
\documentclass{article}
\usepackage{graphicx}
\usepackage{mathtools}
\usepackage{txfonts}
\begin{document}
\[
\text{\scalebox{1.4}{$\kappa$}}(r_0)
\]
\end{document}
K
of your picture is the same of\mathcal{K}
.\usepackage{mathptmx}
, Look at my edited answer.