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Just remove the white space in \begin{equation} [x_i,x_j]=\sum_{m< a\leqslant n}c_{ij}^ax_a,[x_a,x_i]=\sum_jc_{a,i}^ix_j \end{equation}


This is a code that demonstrates two solutions: the psmatrix environment from pst-node (based on pstricks) and the tikz-cd environment from the homonymous package (based on tikz-pgf): \documentclass[pdf]{article} \usepackage{mathtools} \usepackage{pst-node} \usepackage{tikz-cd} \begin{document} \texttt{psmatrix solution: } \[ \psset{arrows=->, ...


The default with the standard classes are paragraphs, whose first lines are indented and without additional space inbetween: \documentclass{article} \usepackage{lipsum} \begin{document} \lipsum[2-4] \end{document} Package parskip adds space between paragraphs and the paragraphs start without indentation: \documentclass{article} \usepackage{lipsum} ...


One advantage of \verb is that underscores are typeset better. For example in \documentclass{article} \usepackage{verbatim} \begin{document} \texttt{foo\_bar} \verb|foo_bar| \end{document} the first foo_bar has a thinner underscore. See Underscores in words (text) for more details.

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