[Tex/LaTex] Display inline sums

displaystyleinline()math-mode

I am writing my thesis and I have some sums which are inline, and others which are part of equations.

My questions is: is there a convention, an unwritten rule about how inline equations should be displayed? Which of the following is the "right" one for this kind of situation?

$T=\{\sum\nolimits_{i:e_{i} \in S_{j}} y_{i} = w_{j}\}$
$T=\{\displaystyle\sum\limits_{i:e_{i} \in S_{j}} y_{i} = w_{j}\}$

In a book I have seen that all the inline sums are written with the first code, while the ones from equations with the second. Is this the correct way?

Best Answer

It is the correct way, because inline formulas shouldn't be too high. Theoretically, the distance between lines should be constant, which is impossible, when formulas are in the display style.

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P.R Halmo's How to Write Mathematics is also good, although not concentrating on typography but more on style and exposition, as he says This is a subjective essay, and its title is misleading; a more honest title might be 'How I write Mathematics' . There is a copy here.

[Tex/LaTex] Typesetting inline Penrose/Cvitanovic tensor diagrams (birdtracks)

I figured out enough about tikz to produce the following:

tensors written in birdtracks notation with tikz

My code is below. Comments would be appreciated, since I don't really know what I'm doing with tikz. Is there a good way to avoid hardcoding the distances between nodes and the size of the circle?

\documentclass{article}
\RequirePackage{tikz}
\begin{document}

\pgfdeclarelayer{nodelayer}
\pgfdeclarelayer{edgelayer}
\pgfsetlayers{edgelayer,nodelayer,main}
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        \begin{pgfonlayer}{nodelayer}
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                \node [style=plain] (n1) at +(2.3em, 0) {$v$};
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\end{tikzpicture}
means the inner product $u_a v^a$.

The following displayed picture represents the tensor expression $u^a_{abc}\nabla_d v^{bc}$:

\begin{tikzpicture}[thick]
        \begin{pgfonlayer}{nodelayer}
                \node [style=plain] (n0) at (0, 0) {$u$};
                \node [style=plain] (n1) at (3.1em, 0) {$v$};
                \node [style=circle,draw=black,minimum size=2.1\baselineskip] (c1) at (n1) {};
        \end{pgfonlayer}
        \begin{pgfonlayer}{edgelayer}
                \draw [style=arrow,out=10,in=170] (n0) to (n1);
                \draw [style=arrow,out=-10,in=190] (n0) to (n1);
                \draw [style=arrow,out=30,in=150, distance=1.8\baselineskip, loop] (n0) to ();
                \draw [style=arrow] (c1.east) to +(1.4em,0);
        \end{pgfonlayer}
\end{tikzpicture}

\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Beyond Bringhurst: mathematical typesetting

[Tex/LaTex] Typesetting inline Penrose/Cvitanovic tensor diagrams (birdtracks)

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