Could you help me with search of such arrow symbol in latex, please?
I know that there is \hookrightarrow. But it's not what I want to use in my article.
[Tex/LaTex] Bent Arrow Symbol
arrowssymbols
Related Solutions
Another option would be to use TikZ to define an \xrightarrowtail macro:
\documentclass{amsart}
\usepackage{tikz}
\makeatletter
\newbox\xrat@below
\newbox\xrat@above
\newcommand{\xrightarrowtail}[2][]{%
\setbox\xrat@below=\hbox{\ensuremath{\scriptstyle #1}}%
\setbox\xrat@above=\hbox{\ensuremath{\scriptstyle #2}}%
\pgfmathsetlengthmacro{\xrat@len}{max(\wd\xrat@below,\wd\xrat@above)+.6em}%
\mathrel{\tikz [>->,baseline=-.75ex]
\draw (0,0) -- node[below=-2pt] {\box\xrat@below}
node[above=-2pt] {\box\xrat@above}
(\xrat@len,0) ;}}
\makeatother
\begin{document}
\[ f : G \xrightarrowtail[{\star}]{\text{\textbf{Grp}}} H \]
\end{document}
This produces the output
(The amsart document class is only used to get \text, and not used in the macro definition.)
Edit: I realize I should probably explain what's going on here. It's not too complicated: we allocate boxes \xrat@below and \xrat@above to store the text we're going to place above and below, and we fill them with our arguments set as script-style math. We then set \xrat@len, which will be the arrow length, to the larger of the two widths plus .6 ems for padding on either side. We then simply draw the arrow, placing the below box below and above box below. It's worth noting that the values in +.6em, baseline=.75ex, below=-2pt, and above=-2pt are all completely arbitrary, and result from me tinkering briefly; changing them might give better results for your use case. The baseline option moved the arrow up to the middle, instead of having it trail along the ground, and the below and above options set the text closer to the arrow, which is desired in this context.
A better solution would probably be to figure out how to use Strike that, this would require the missing amsmath's \ext@arrow command (which it uses to define \xleftarrow and \xrightarrow, and which other packages for similar commands seem to use as well), but I can't figure out how it works.\arrowtail (>--) macro which you were asking about in the first place (since extpfeil uses \ext@arrow under the hood as well). I suppose the best bet might be to create such a character in Metafont or some such, but I'm not sure how to do that.
The mathtools package gives you extansible hook-arrows which some authors use for inclusions:
\documentclass{article}
\usepackage{mathtools}
\begin{document}
\[
A\xhookrightarrow{} B\qquad A\xhookrightarrow{f\circ g} B\qquad
A \xhookrightarrow[(f\circ g)\circ h]{} B
\]
\end{document}
You can also use \xrightarrow from amsmath if you want an extensible "standard" arrow with super/subscripts:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
A\rightarrow{} B\qquad A\xrightarrow{f\circ g} B\qquad
A \xrightarrow[(f\circ g)\circ h]{} B
\]
\end{document}
Best Answer
A TikZ answer; you could personalize the appeareance passing TikZ style commands in the optional argument.