2

The vertical space before and after equation (1) is greater than the vertical space before and after equation (2).

Which is the rule/reason for that?

\documentclass{book}
\usepackage{amsmath,amsfonts}
\usepackage{setspace}
\usepackage{mwe}
\begin{document}
\doublespacing
Is it normal that the vertical space before and after this equation:
\begin{equation}
a = b + c
\end{equation}
is more than the space before and after this other equation?
\begin{equation}
d=\sum_{i=1}^{k}e_i
\end{equation}
\blindtext
\end{document}

enter image description here

  • 2
    Yes, it is normal. Measure the distance between the baselines. – egreg 2 days ago
  • 2
    The spaces are exactly the same -- compare the gaps between the surrounding text, not the distance from the highest/lowest elements of the displayed material. The difference you observe is the fact that there is a large operator with limits in the second display; that is not part of the defined measurement, which is correctly described by @egreg. – barbara beeton 2 days ago
  • @egreg Thank you! Would you like to add an answer? – CarLaTeX 2 days ago
  • @barbarabeeton idem ^^^ – CarLaTeX 2 days ago
2

The spaces are exactly the same -- compare the gaps between the surrounding text, not the distance from the highest/lowest elements of the displayed material.

The difference you observe is the fact that there is a large operator with limits in the second display; that is not part of the defined measurement, which is correctly described by @egreg (in a comment) as the distance between baselines.

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