I am trying to make something that looks like enter image description here

I am trying to go from here (works):

A \arrow{r}\arrow{rd}
&B \arrow{d}\arrow[leftarrow]{r}
&C \arrow{ld}\\

to here (doesn't work):

A \arrow{r}\arrow{rd} \arrow{rdd}
&B \arrow{d}\arrow[leftarrow]{r}
&C \arrow{ld} \arrow{ldd} \\

I try many combinations but don't see how the tikz@x-y-z values work. Any help is appreciated.




You have to use three columns.



\begin{tikzcd}[row sep=4em]
X_{i} \arrow[rr,"f_{ij}"] \arrow[dr,"\phi_{i}"]
  \arrow[ddr,swap,end anchor={[xshift=0.2em]north west},"\psi_{i}"]
X_{j} \arrow[dl,swap,"\phi_{j}"] 
  \arrow[ddl,end anchor={[xshift=-0.2em]north east},"\psi_{j}"]
& X \arrow[d,"u"]
& Y


The end anchor are just to avoid the arrow ends to be too near to each other.

enter image description here

  • 1
    For inverse limit, just dualize, of course. ;-) – egreg Jul 25 '14 at 20:49

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