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I'm using Lyx editor and have added the amsmath environment. And in the editor, I can input the \biggg{ to show a slightly bigger { than the \bigg{. But it has errors when compiling the document. So, is there a bigger { than the \bigg{ or \Bigg{?

For example, in the following equation, I want the pair {} should be one level larger than the pair [] for better view. The {} for the equation is using \Bigg{ and \Bigg}.

equation

mining
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1 Answers1

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Personally, I wouldn't make larger braces in the example you posted, but rather smaller brackets. However, you can easily extend the predefined sizes of amsmath. The latex.ltx format defines

\def\bigl{\mathopen\big}
\def\bigm{\mathrel\big}
\def\bigr{\mathclose\big}
\def\Bigl{\mathopen\Big}
\def\Bigm{\mathrel\Big}
\def\Bigr{\mathclose\Big}
\def\biggl{\mathopen\bigg}
\def\biggm{\mathrel\bigg}
\def\biggr{\mathclose\bigg}
\def\Biggl{\mathopen\Bigg}
\def\Biggm{\mathrel\Bigg}
\def\Biggr{\mathclose\Bigg}

and the original definition of \big & Co. is overwritten by amsmath, which replaces them by

\renewcommand{\big}{\bBigg@\@ne}
\renewcommand{\Big}{\bBigg@{1.5}}
\renewcommand{\bigg}{\bBigg@\tw@}
\renewcommand{\Bigg}{\bBigg@{2.5}}

Here \bBigg@ is the macro which actually does the scaling job: it takes an argument (the height in a length called \big@size). So you can use the following lines

\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
campa
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