% \documentclass{book}
\documentclass{book}
\usepackage{pstricks,pst-node,amssymb,amsmath,graphics,latexsym,tabularx,shapepar}
\usepackage[all,cmtip,2cell,line]{xypic}
\UseAllTwocells\SilentMatrices


\begin{document}


\baselineskip=.6cm
$\xymatrix{A&B\ltwocell_f^g{`\alpha}}$

$$\xymatrix {A\ar[r]^G&\sin(\tan(\cos x))}\qquad\xymatrix{A\ar[r]^-G&\sin(\tan(\cos x))}$$

$$\xymatrix@C=2cm{A\ar[r]^G&B}$$
$$\xymatrix@C=2cm{A\ar[r]^(.25)G&B}$$
$$\xymatrix@C=2cm{A\ar[r]^(.75)G&B}$$
$$\xymatrix@C=2cm{A\ar[r]^(-.25)G&B}$$
$$\xymatrix@C=2cm{A\times B\times C\ar[r]^f\ar[d]&B\ar[d]\\
A\ar[r]_g&A\times B\times C}$$
$$\xymatrix@!=2cm{A\ar[r]^f\ar[d]&B\ar[d]\\
A\ar[r]_g&C}$$
$$\xymatrix@R=2cm{A\ar[r]^f\ar[d]&B\ar[d]\\
A\ar[r]_g&C}$$
$$\xymatrix@C=2cm{A\ar[r]^f\ar[d]&B\ar[d]\\
A\ar[r]_g&C}$$
$$\xymatrix@C=2cm @R=3cm{A\ar[r]^f\ar[d]&B\ar[d]\\
A\ar[r]_g&C}$$
$$\xymatrix@C=2cm{A\ar@<3mm>[r]^G&B}$$
$$\xymatrix@C=2cm{A\ar@<-3mm>[r]^G&B}$$
$$\xymatrix@C=2cm{A\ar@<2mm>[r]^f\ar@<-2mm>[r]_g&B}$$
 $$\underset{ali}{Shahram}$$
 $$\xymatrix@C=2cm{A\ar@<-1mm>@{-->}[r]_f&B}$$

 $$\xymatrix@C=2cm{A\ar@<-1mm>@3{-->}[r]_f&B}$$
 $$\xymatrix@C=2cm{A\ar@/^5mm/@<-1mm>@{-->}[r]_f&B}$$
 $$\xymatrix@C=2cm{A\ar@/_5mm/@<-1mm>@{-->}[r]_f&B}$$
 $$\xymatrix@C=2cm{A\ar@*{[red]}[r]_f&B}$$
\newdir{|>}{%
 !/4.5pt/@{|}*:(1,-.2)@^{>}*:(1,+.2)@_{>}}
 \newdir{ |>}{{}*!/-1pt/@{|}*!/-6pt/:(1,-.2)@^{>}*!/-6pt/:(1,+.2)@_{>}}

 $$\xymatrix@C=2cm{A\ar@{|>}[r]_f&B}$$


$$\xymatrix @!=2pc {
**[l] A\times B
\ar[r]^{A} \ar[d]_{B}
& B \ar[d]^{\times A}
\\
A \ar[r]_{B\times}
& **[r] B\times A
}$$

$$\xymatrix @W=1pc @H=1pc @R=3pc  @!=4pc @L=.31pc{
**[l] A\times B
\ar[r]^{A} \ar[d]_{B}
& B \ar[d]^{\times A}
\\
A \ar[r]_{B\times}
& **[r] B\times A 
}$$

$$\xymatrix{
A\ar[d]_\alpha \ar[r]^f & B\ar[d]^\beta\\
C \ar[r]_g  &D}$$

\UseCrayolaColors
\SelectTips {lu}{12}
\newdir{|>}{!/4.5pt/\dir{|}
*:(1,-.2)\dir^{>}
*:(1,+.2)\dir_{>}}$$\xy\xymatrix{
P \ar @{=|>}[r]^{\pi_i} &A_i\\
B \ar[u]^\phi\ar[ur]_{\phi_i}  &}\endxy$$

%\begin{scriptsize}

%\end{scriptsize}
\SelectTips {cm}{12}
%\SelectTips {eu}{12}\SelectTips {lu}{12}
%\SelectTips {xy}{12}
\xymatrixrowsep{2cm}
\xymatrixcolsep{5pc}%\rtwocell<10>
$$
 %\xy
\xymatrix{
P \ar [r]^{\pi_i} &A_i\\
B \ar[u]^\phi\ar[ur]_{\phi_i}  &}
 %\endxy
$$

\xymatrixrowsep{1cm}
\xymatrixcolsep{2pc}
$$\xy
\xymatrix{
A \POS[];[d]**\dir{~},
[];[dr]**\dir{-} \\
B & C \POS[];[l]**\dir{.} }
\endxy$$






$$\xymatrix @M=1pc @!=1cm @=2cm{
**[l] A\times B
\ar[r]^{A} \ar[d]_{B}
& B \ar[d]^{\times A}
\\
A \ar[r]_{B\times}
& **[r] B\times A 
}$$

$$\xymatrix @*[F] {
 **[l]A\times B
\ar[r]^{A} \ar[d]_{B}
& B \ar[d]^{\times A}
\\
A \ar[r]_{B\times}
&**[r] B\times A 
}$$



$$\everyentry={{\the\Row,\the\Col}}
\xymatrix @*[F]@*[o] {
{} \POS[];[r]**\dir{..} & \\
{} \POS[];[ur]**\dir{--}
}$$

$$\xymatrix{
C\ar@{.>}@/_6mm/[rr]_{\bar fg^{-1}}\ar[r]^>>>>>>{g^{-1}}&{B\over  ker\psi}= {B\over  Im\phi}\ar[r]^<<<<{\bar f}&D
}$$

$$\xymatrix {
 A\times B
\ar@/^23mm/[rd]^{A} \ar[d]
& B \ar[d]
\\
A \ar@/u3ex/[r]_{B\times}
&  B\times A 
}$$

$$\xymatrix {
 A\ar[r]^{A} \ar@/l3mm/[d]
& B \ar@/r3ex/[d]
\\  A \ar@/d3ex/[r]_{B\times}
% A \ar@*{[red]}@*{[|<4pt>]}[r]_{B\times}
&  B
}$$


$$\xymatrix {
    &&\\
 A\ar[rr]^\Downarrow_\Downarrow  \ar@/u8mm/[rr]\ar@/u-8mm/[rr]&& C \\
   & &
}$$
\\




\xy/r8pc/:*++\txt\huge{C}="c"
,0*++\txt\huge{P}="p",
,"p",{\ar@*{[|(1)]}"p";"c"<20pt>}
,"p",{\ar@*{[|(4)]}"p";"c"<14pt>}
,"p",{\ar@*{[|(10)]}"p";"c"<4pt>}
,"p",{\ar@*{[|(20)]}"p";"c"<-16pt>}
\endxy







\end{document}