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How can I give shape to some arrow in tikz, to draw the inclusion arrow?

I read a similar question How to typeset inclusion arrow? with given answer, but the answer didn't really used TikZ, which I really need in order to produce nice large diagrams.

For instance, in this diagram (taken from here ), I want, say, A to be included in A' :

matrix (m) [matrix of math nodes, row sep=3em, column sep=3em]

{ 0 & A  & B  & C  & 0 \

  0 & A' & B' & C' & 0 \ };

 { [start chain] chainin (m-1-1);

chainin (m-1-2);

{ [start branch=A] chainin (m-2-2)

    [join={node[right,labeled] {eta_1}}];}

chainin (m-1-3) [join={node[above,labeled] {varphi}}];

{ [start branch=B] chainin (m-2-3)

    [join={node[right,labeled] {eta_2}}];}

chainin (m-1-4) [join={node[above,labeled] {psi}}];

{ [start branch=C] chainin (m-2-4)

    [join={node[right,labeled] {eta_3}}];}

chainin (m-1-5); }

 { [start chain] chainin (m-2-1);

chainin (m-2-2);

chainin (m-2-3) [join={node[above,labeled] {varphi'}}];

chainin (m-2-4) [join={node[above,labeled] {psi'}}];

chainin (m-2-5); }

For commutative diagrams I suggest using the tikz-cd package; it uses TikZ to facilitate the drawing of commutative diagrams (it has its own arrows library designed for diagrams and the arrow you are looking for is already buil-in); a little example with the requested inclusion (and some others just for illustration):

documentclass{article}

usepackage{tikz-cd}



begin{document}



begin{tikzcd}

0 arrow[hookrightarrow]{r} 

  & Aarrow[hookrightarrow]{r}{varphi}arrow[hookrightarrow]{d}{eta_1} 

  & Barrow{r}{psi}arrow{d}{eta_2} 

  & Carrow{r}arrow{d}{eta_3} 

  & 0 \

0 arrow[hookrightarrow]{r} 

  & A'arrow[hookrightarrow]{r}[swap]{varphi'} 

  & B'arrow{r}[swap]{psi'} 

  & C'arrow{r}

  & 0 

end{tikzcd}

end{document}

You can use the arrows library from TikZ, so for example, to use the -latex style from TikZ, you can say

documentclass{article}

usepackage{tikz-cd}

usetikzlibrary{arrows}



tikzset{

commutative diagrams/.cd,

arrow style=tikz,

diagrams={>=latex}}



begin{document}





begin{tikzcd}

0 arrow[hookrightarrow]{r} 

  & Aarrow[hookrightarrow]{r}{varphi}arrow[hookrightarrow]{d}{eta_1} 

  & Barrow{r}{psi}arrow{d}{eta_2} 

  & Carrow{r}arrow{d}{eta_3} 

  & 0 \

0 arrow[hookrightarrow]{r} 

  & A'arrow[hookrightarrow]{r}[swap]{varphi'} 

  & B'arrow{r}[swap]{psi'} 

  & C'arrow{r}

  & 0 

end{tikzcd}

end{document}

The above code changes the tip arrow style for all the diagrams, but you can select the -latex arrow tip just for some arrows (perhaps not really desirable to have two different arrow tips on the same diagram):

arrow[hookrightarrow,-latex]{d}{eta_1}

You can use the right hook-latex , or right hook-> arrow (depending on the arrow type you want on the other side) from the arrows library:

Code:

documentclass{article}

usepackage{tikz}

usetikzlibrary{arrows}

begin{document}

begin{tikzpicture}

  draw [ultra thick, right hook-latex, red] (0, 0) -- (3, 0);     

  draw [ultra thick, right hook->,    blue] (0,-1) -- (3,-1);

end{tikzpicture}

end{document}