formattingmath-mode
I would like to make an inner-product symbol for my math paper. I would like it to work along the lines of \frac{arg1}{arg2}. Specifically, I would like to make a function, so that I could say
\inner{arg1}{arg2},
and get something that looked like
\langle arg1, arg2 \rangle. If someone could guide me through how to do this, it would be appreciated.
Scott Pakin's Comprehensive LaTeX Symbol List identifies the structure of extensible delimiters in section 8.2 Resizing symbols (p 100-102):
All variable-sized delimiters are defined (by the corresponding
.tfmfile) in terms of up to five segments, as illustrated by Figure 1 on page 102. The top, middle, and bottom segments are of a fixed size. The top-middle and middle-bottom segments (which are constrained to be the same character) are repeated as many times as necessary to achieve the desired height.
This is merely informative since I am unfamiliar with the procedure of how to create these things in a .tfm file.
Conveniently, scalerel provides \scaleleftright[<max width>]{<left obj>}{<stuff>}{<right obj>} (and a comparable \stretchleftright) for scaling/stretching both <left obj> and <right obj> to the height of <stuff> (constrained, if required and optional, to a width of <max width>). Here's a quick example:
\documentclass{article}
\usepackage{scalerel}% http://ctan.org/pkg/scalerel
\begin{document}
\[ \stretchleftright{\dagger}{\displaystyle\sum_{i=1}^n i}{\dagger} \]
\[ \scaleleftright{\dagger}{\displaystyle\sum_{i=1}^n i}{\dagger} \]
\end{document}
Here is a suggestion using scrlayer to define an layer page style for these pages:
\usepackage{scrlayer}
\DeclareNewLayer[
foreground,
%textarea,% use only the textarea
contents={%
\parbox[b][\layerheight][c]{\layerwidth}
{\centering The space above and below the message
intentionally is left blank.}%
}
]{blankpage.fg}
\DeclarePageStyleByLayers{blank}{blankpage.fg}
Note that you can still use a package of your choice for the other headers and footers of the other pages. In the example below fancyhdr is used.
\documentclass[12pt,letterpaper]{article}
\usepackage{scrlayer}
\DeclareNewLayer[
foreground,
%textarea,% use only the textarea
contents={%
\parbox[b][\layerheight][c]{\layerwidth}
{\centering The space above and below the message
intentionally is left blank.}%
}
]{blankpage.fg}
\DeclarePageStyleByLayers{blank}{blankpage.fg}
\usepackage{fancyhdr}
\pagestyle{fancy}
\usepackage{blindtext}
\begin{document}
\begin{titlepage}
\Huge Titlepage
\end{titlepage}
\newpage\null\thispagestyle{blank}\newpage
\setcounter{page}{1}
\tableofcontents
\newpage
\listoffigures
\newpage\null\thispagestyle{blank}\newpage
\blinddocument
\end{document}
Best Answer
Using
mathtoolsyou can make a definition that allows resizing of the brackets when necessary.In this version
\inpjust prints standard sized brackets and\inp*uses\left...\rightto scale the brackets to enclose the material. Often\inp*will produce brackets that are too big, and manual scaling can be provided by\inp[\big],\inp[\Big],\inp[\bigg],\inp[\Bigg]etc.