The command \rightrightarrows (from amssymb) draws two arrows, one on top of another. How do I get three arrows arranged in a similar fashion? An example of this (and other fancy arrow stackings) appears on page 3 of this paper, for which a source file unfortunately does not seem to be available. Commands like \stackrel and \overset do not size or space things properly.
[Tex/LaTex] How to stack more than two arrows in math mode
arrowsmath-modesymbols
Related Solutions
The problem is that the tikz definition you gave doesn't scale with the smaller math styles. To overcome that, we use the scalerel package to scale (on the fly) the good normal-sized arrow to the same vertical extent as the original arrow that you are replacing, in the current math style.
\documentclass{minimal}
\usepackage{scalerel}
\usepackage{tikz}
\usetikzlibrary{arrows}
\let\svrightarrow\rightarrow
\newcommand{\TSrightarrow}{\mathbin{\tikz[baseline]\draw[arrows={-angle 90},yshift=0.75ex] (0,0) -- (.95em,0);}}
\renewcommand\rightarrow{\mathrel{\scalerel*{\TSrightarrow}{\svrightarrow}}}
\parindent 0pt
\begin{document}
$x^2 - 2x + 1 = 0 \svrightarrow (x-1)^2 = 0 \svrightarrow x = 1$\\~\\
$x^2 - 2x + 1 = 0 \rightarrow (x-1)^2 = 0 \rightarrow x = 1$\\~\\
\( \lim_{h\svrightarrow0}\frac{f(x+h)-f(x)}{h} \)\\~\\
\( \lim_{h\rightarrow0}\frac{f(x+h)-f(x)}{h} \)
\end{document}
chemfig allows to add explizit node names to either bonds or atoms in its formulae by using the @{<name>} syntax. These names can be used in a tikzpicture with the options remember picture, overlay to draw the curved arrows. chemfig provides the wrapper \chemmove for this. So a combination of chemfig and TikZ can be used to draw the schemes. (BTW: the chemfig manual actually has quite a few examples of such schemes...)
Here is something that might get you started:
\documentclass{article}
\usepackage{chemfig}
\tikzset{
elmove/.style={->,shorten >=3pt, shorten <=3pt}
}
\begin{document}
\schemestart
\chemfig{*8(-[@{sb1}]=[@{db1}]-[@{sb2}]=[@{db2}]-[@{sb3}]=[@{db3}]-[@{sb4}]=[@{db4}])}
\arrow{<->}
\chemfig{*8(=-=-=-=-)}
\schemestop
\chemmove[red,elmove]{
\draw (db1) .. controls +(90:5mm) and +(45:5mm) .. (sb1) ;
\draw (db2) .. controls +(180:5mm) and +(135:5mm) .. (sb2) ;
\draw (db3) .. controls +(270:5mm) and +(225:5mm) .. (sb3) ;
\draw (db4) .. controls +(0:5mm) and +(315:5mm) .. (sb4) ;
% similar the others
}
\bigskip
\schemestart
\chemfig{**6(----[@{b}]--)}
\arrow(benzene.base east--.base west){->[][][15pt]}
\chemfig{**[120,420,dashed]6(---(-[,-1,,,draw=none]{+})-(-[:120]H)(-[:60]NO_2)--)}
\arrow(@benzene.45--){0}[45,.2]
\chemfig{@{N}\chemabove{N}{+}O_2}
\schemestop
\chemmove[blue,elmove]{
\draw[shorten <=-5pt] (b) .. controls +(30:5mm) and +(-90:1cm) .. (N) ;
}
\end{document}
My package modiagram can be used to draw the electronic state diagram. IMHO It doesn't fit perfectly and a TikZ-only solution may be preferable. On the other hand the code is rather easy:
\documentclass[11pt]{book}
\usepackage[utf8]{inputenc}
\usepackage{chemformula,modiagram,chemfig}
% necessary due to stupid bug in `modiagram':
\newcommand*\makecolonother{\catcode`\:=12 }
\begin{document}
\ch{_4Be}: 1s$^2$~2s$^2$
ground state:
\begin{MOdiagram}[style=square,AO-width=8pt]
\AO(0pt){s}{0;pair}
\AO(12pt){s}{0;pair}
\AO(24pt){s}{0;}
\AO(34pt){s}{0;}
\AO(44pt){s}{0;}
\draw[overlay,red,->]
(AO2.north) .. controls +(0,.5) and +(0,.5) .. (AO3.north) ;
\end{MOdiagram}
excited state:
\begin{MOdiagram}[style=square,AO-width=8pt]
\AO(0pt){s}{0;pair}
\AO(12pt){s}{0;up}
\AO(24pt){s}{0;up}
\AO(34pt){s}{0;}
\AO(44pt){s}{0;}
\makecolonother
\draw[<-,overlay]
(AO2.south) -- ++(-100:3mm) node[below] {Cl} ;
\draw[<-,overlay]
(AO3.south) -- ++(-80:3mm) node[below] {Cl} ;
\end{MOdiagram}
\end{document}
Best Answer
Use
\substackyou can change
[-1em]to be any value as you want.(Added by Hendrik Vogt:) With
you get something quite close to
\rightrightarrows.