Fonte do sinal de soma

Question

Atualização 1: 2024/05/03

O \sumsímbolo é retirado do pacote txfonts(ou você pode tirar de Libertinus Math): veja MWE curto e da figura.

%% Compile and read me!
\documentclass[a4paper,12pt]{article}
\usepackage{txfonts}
\usepackage[T1]{fontenc}
\begin{document}
\[\sum^{n}_{i=1}{xcv}\]
\end{document}

Com o motor XeLaTeX: Na minha humilde opinião, \sumum símbolo muito próximo é dado deSTIX Dois Matemática. Tentei também Cambria Math(ver 2º código) mas é grande: mas é possível esticar verticalmente o símbolo com scalerelpacote (não tentei). Se você conhece a fonte comum, cancele STIX Two Mathe coloque o nome da fonte.

\documentclass[12pt]{article}
\usepackage{unicode-math}
\setmathfont{Latin Modern Math}
\setmathfont[range={\sum}, Scale=MatchUppercase]{STIX Two Math}
\let\mathbb\relax % remove the definition by unicode-math
\DeclareMathAlphabet{\mathbb}{U}{msb}{m}{n}
\begin{document}
The range of matrix $A\in\mathbb{K}^{I\times J}$ is
\[
\operatorname{range}(A)=\{Ax\colon x\in\mathbb{K}^{J}\}=\operatorname{span}\{A_{(j)},i\in J\}.
\]

Hence, the range of a matrix is a vector space spanned by its columns. The Euclidean scalar product in $\mathbb{K}^I$ is given by.
\[\langle x,y\rangle=y^Hx=\sum_{i\in I}x_i\bar{y}_i,\]
 
where for $\mathbb{K}=\mathbb{R}$ the conjugate sign can be ignored. It is often useful and very

\end{document}

ou com Cambria Math:

\documentclass[12pt]{article}
\usepackage{unicode-math}
\setmathfont{Latin Modern Math}
\setmathfont[range={\sum}, Scale=MatchUppercase]{Cambria Math}
\let\mathbb\relax % remove the definition by unicode-math
\DeclareMathAlphabet{\mathbb}{U}{msb}{m}{n}
\begin{document}
The range of matrix $A\in\mathbb{K}^{I\times J}$ is
\[
\operatorname{range}(A)=\{Ax\colon x\in\mathbb{K}^{J}\}=\operatorname{span}\{A_{(j)},i\in J\}.
\]

Hence, the range of a matrix is a vector space spanned by its columns. The Euclidean scalar product in $\mathbb{K}^I$ is given by.
\[\langle x,y\rangle=y^Hx=\sum_{i\in I}x_i\bar{y}_i,\]
 
where for $\mathbb{K}=\mathbb{R}$ the conjugate sign can be ignored. It is often useful and very

\end{document}

Você também pode ver isso TeX Gyre Pagella Math(bom):

\documentclass[12pt]{article}
\usepackage{unicode-math}
\setmathfont{Latin Modern Math}
\setmathfont[range={\sum}, Scale=MatchUppercase]{TeX Gyre Pagella Math}
\let\mathbb\relax % remove the definition by unicode-math
\DeclareMathAlphabet{\mathbb}{U}{msb}{m}{n}
\begin{document}
The range of matrix $A\in\mathbb{K}^{I\times J}$ is
\[
\operatorname{range}(A)=\{Ax\colon x\in\mathbb{K}^{J}\}=\operatorname{span}\{A_{(j)},i\in J\}.
\]
Hence, the range of a matrix is a vector space spanned by its colunns. The Euclidean scalar product in $\mathbb{K}^I$ is given by.
\[\langle x,y\rangle=y^Hx=\sum_{i\in I}x_i\bar{y}_i,\]
where for $\mathbb{K}=\mathbb{R}$ the conjugate sign can be ignored. It is often useful and very
\end{document}

com TeX Gyre Termes Mathbom):

Answer 1