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I wish to get larger parens than \Biggl(\Biggr) with NewTX fonts. However, following https://tex.stackexchange.com/a/387592 and feeding pdflatex with

\documentclass{standalone}
\usepackage{newtxtext}
\usepackage[slantedGreek,subscriptcorrection]{newtxmath}
\makeatletter
\newcommand{\biggg}{\bBigg@\thr@@}
\newcommand{\Biggg}{\bBigg@{3.5}}
\def\bigggl{\mathopen\biggg}
\def\bigggm{\mathrel\biggg}
\def\bigggr{\mathclose\biggg}
\def\Bigggl{\mathopen\Biggg}
\def\Bigggm{\mathrel\Biggg}
\def\Bigggr{\mathclose\Biggg}
\makeatother
\begin{document}
\(\bigggl(\Biggl(\biggl(\Bigl(\bigl(()\bigr)\Bigr)\biggr)\Biggr)\bigggr)\)
\end{document}

we get

output

As you see, there is no difference between \bigggl( and \Biggl(, and there is no difference between \Biggr) and \bigggr). The parens do not get larger. Why? What to do?

1 Answers1

3
\documentclass{standalone}
\usepackage{newtxtext,newtxmath}

\makeatletter
\def\biggg{\bBigg@{3.5}} % I changed \thr@@ to {3.5}
\def\Biggg{\bBigg@{4}}   % I changed {3.5} to {4}
\makeatother
\def\bigggl{\mathopen\biggg}
\def\bigggm{\mathrel\biggg}
\def\bigggr{\mathclose\biggg}
\def\Bigggl{\mathopen\Biggg}
\def\Bigggm{\mathrel\Biggg}
\def\Bigggr{\mathclose\Biggg}

\begin{document}

\(
\Bigggl(\bigggl(\Biggl(\biggl(\Bigl(\bigl((
)\bigr)\Bigr)\biggr)\Biggr)\bigggr)\Bigggr)
\)

\end{document}

enter image description here

hair-splitter
  • 2,741
  • Thx, got it. Even \newcommand{\biggg}{\bBigg@{3.07766}} and \newcommand{\Biggg}{\bBigg@{3.56997}} would do. However, why does this happen in first place? Given that the constants \@ne, 1.5, \tw@, and 2.5 are used in amsmath.sty to define \big, \Big, \bigg, and \Bigg, shouldn't the next constant to be used be \thr@@? –  Jul 08 '22 at 11:48
  • After all, \thr@@ for \biggg and 3.5 for \Biggg work for standard Computer Modern. They also work with lualatex and TeX Gyre Termes (Math). –  Jul 08 '22 at 12:21
  • @GeekestGeek Internally, the various \big macros use \left and \right, which in turn choose which delimiter to use based on the font's size and parameters. Clearly, for newtx a vertical span of 3.5 (in units of \big@size, which itself is based on the size of \Mathstrutbox@) isn't enough to trigger the larger size. See e.g. https://tex.stackexchange.com/a/385914/82917 for a similar issue with tgheros. – campa Jul 08 '22 at 16:36