amsmath
i want to change the Summation Sign so thats as big as the text i wrote after.
\documentclass[a4paper, 12pt,fleqn]{article}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[fleqn]{amsmath}
\usepackage{mathptmx}
\begin{document}
$\sum C_i$
\end{document}
How can i change it like in the following picture ?
why the rest of my code is not in the right code sample???
This is a version of \big that's a bit smaller at 10pt size, but scales with em and with \scriptsize.
\documentclass{article}
%\def\big#1{{\hbox{$\left#1\vbox to8.5\p@{}\right.\n@space$}}}
%\def\bigl{\mathopen\big}
%\def\bigr{\mathclose\big}
\makeatletter
\def\myl{\mathopen\mybig}
\def\myr{\mathclose\mybig}
\def\mybigx#1{\dimen@#1\relax
\mathchoice
{\vbox to \dimen@{}}%
{\vbox to \dimen@{}}%
{\vbox to .7\dimen@{}}%
{\vbox to .5\dimen@{}}}%
\def\mybig#1{{\hbox{$\left#1\mybigx{.8em}\right.\n@space$}}}
\makeatother
\begin{document}
\[ x^{\sum_{i=1}^{N} \myl(\frac{a_i + 1}{2b_i} + c_i\myr)} \]
\[\textstyle x^{\sum_{i=1}^{N} \myl(\frac{a_i + 1}{2b_i} + c_i\myr)} \]
\[\scriptstyle x^{\sum_{i=1}^{N} \myl(\frac{a_i + 1}{2b_i} + c_i\myr)} \]
\[\scriptscriptstyle x^{\sum_{i=1}^{N} \myl(\frac{a_i + 1}{2b_i} + c_i\myr)} \]
\end{document}
Don't use align. Use gather instead.
\documentclass[fleqn]{article}
\usepackage{amsmath}
\begin{document}
\begin{gather}
b := (a \oplus s_1) \oplus s_2 \\
e := 0
\end{gather}
\end{document}
Best Answer
You can require
\displaystylefor the formula, but this will probably change the interlining locally, especially if there are bounds for the sum. Another solution would be to use\medopfromnccmath, which defines a bunch of medium-sized commands for formulae (~80 % ofdisplaystyle):