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Sorry for the lame question. \left and \right are not resulting in upsizing of parentheses all through my document, and I don’t know what’s breaking them problem

The code for the bottom equaition is as follows:

\begin{equation}
\frac{1}{λ} = R_H \left(\frac{1}{n_f^2} - \frac{1}{n_i^2}\right)
\label{eqn:rydberg relation}
\end{equation}

I am using

\usepackage{amsmath,amssymb}
\usepackage{unicode-math}
\usepackage{fontspec}
\usepackage{tikz}
...

with MacTeX. I’ve wasted a lot of time trying to figure out why this isn’t working. What could be the cause? How should I start to debug it?

Solution:

Don’t begin an abstract with \abstract. Use \begin{abstract} ... \end{abstract}. The former is not delimited and will make the whole document the abstract.

(I had always thought \abstract was similar to \section{Title}.)

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9
  • 1
    To find the cause and to start to debug make a MWE and add it to your question.
    – Schweinebacke
    May 16, 2017 at 6:09
  • 4
    I tried with XeLaTeX and LuaLaTeX and got the expected size (which is too large, by the way, because of the subscript f; \bigg size would be better).
    – egreg
    May 16, 2017 at 6:18
  • The problem is ‘fixed’ when I delete my abstract. I still don’t know why removing that would affect the very end of the document (from which the screenshot was taken). Is there anything wrong with starting the abstract with \abstract?
    – Jollywatt
    May 16, 2017 at 6:28
  • (I should add that the problem persists even when the abstract is empty…)
    – Jollywatt
    May 16, 2017 at 6:28
  • 3
    \abstract is wrong and will put the entire document in to the abstract as there is no \end{abstract} but it is unlikely to affect \left \right. But whatever the problem is it is in the part of the document you showed as .... so no one can really help you. the posted example should make it possible for people to replicate the problem and debug it.
    – David Carlisle
    May 16, 2017 at 6:44

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