I wanted to start a meta question, but I don’t see a point of that after viewing some related posts listed at the end of the next subsection.
Intended question
You may vote on your preferred way.
| Ways | Advantages | Disadvantages |
|---|---|---|
| AMScd | supported on Math.SE for a long time |
|
array |
|
|
| ASCIIFlow | WYSIWYG interface | lines are rendered as slashes in code |
| TikZ |
|
not supported on SE, need to import as picture |
| others? |
Related questions:
- https://math.meta.stackexchange.com/q/9632/290189
- https://math.meta.stackexchange.com/q/30580/290189
AMScd
Adapted from MathJax tutorial for commutative diagrams.
$$ \require{AMScd} \require{enclose} \begin{CD} \Large{\enclose{circle}{A}} @>a» \Large{\enclose{circle}{B}} \ @V b V V @V 1-c \uparrow V c V \ \Large{\enclose{circle}{C}} @»d> \Large{\enclose{circle}{D}} \end{CD} $$
$$
\require{AMScd}
\require{enclose}
\begin{CD}
\Large{\enclose{circle}{A}} @>a>> \Large{\enclose{circle}{B}} \\
@V b V V @V 1-c \uparrow V c V \\
\Large{\enclose{circle}{C}} @>>d> \Large{\enclose{circle}{D}}
\end{CD}
$$
$\rm\LaTeX$’s array environment
Thanks to AMScd. The diagram below is modified from the MathJax tutorial’s answer
$$
\require{enclose}
\begin{array}{ccccccccc}
&&& \curvearrowleft\tfrac13 &\
\Large{\enclose{circle}{A}} & \xrightarrow{0.1} & \Large{\enclose{circle}{B}} & \xrightarrow{0.2} & \Large{\enclose{circle}{C}} & \xleftarrow{0.3} & \Large{\enclose{circle}{D}} & \xleftarrow{0.4} & \Large{\enclose{circle}{E}}\\
\scriptsize{0.5}\large{\downarrow} & \scriptsize{0.6}\large{\searrow} & \scriptsize{0.7}\large{\downarrow} & \scriptsize{0.8}\large{\nearrow} & \scriptsize{0.9}\large{\downarrow} & \scriptsize{0.1}\large{\swarrow} & \scriptsize{0.2}\large{\downarrow} & \scriptsize{0.3}\large{\nwarrow} & \scriptsize{0.4}\large{\downarrow}\\
\Large{\enclose{circle}{F}} & \xrightarrow[0.5]{} & \Large{\enclose{circle}{G}} & \xrightarrow[0.6]{} & \Large{\enclose{circle}{H}} & \xleftarrow[0.7]{} & \Large{\enclose{circle}{I}} & \xleftarrow[0.8]{} & \Large{\enclose{circle}{J}}\
\circlearrowright\tfrac12\
\end{array}
$$
$$
\require{enclose}
\begin{array}{ccccccccc}
&&& \curvearrowleft\tfrac13 &\\
\Large{\enclose{circle}{A}} & \xrightarrow{0.1} & \Large{\enclose{circle}{B}} & \xrightarrow{0.2} & \Large{\enclose{circle}{C}} & \xleftarrow{0.3} & \Large{\enclose{circle}{D}} & \xleftarrow{0.4} & \Large{\enclose{circle}{E}}\\\
\scriptsize{0.5}\large{\downarrow} & \scriptsize{0.6}\large{\searrow} & \scriptsize{0.7}\large{\downarrow} & \scriptsize{0.8}\large{\nearrow} & \scriptsize{0.9}\large{\downarrow} & \scriptsize{0.1}\large{\swarrow} & \scriptsize{0.2}\large{\downarrow} & \scriptsize{0.3}\large{\nwarrow} & \scriptsize{0.4}\large{\downarrow}\\\
\Large{\enclose{circle}{F}} & \xrightarrow[0.5]{} & \Large{\enclose{circle}{G}} & \xrightarrow[0.6]{} & \Large{\enclose{circle}{H}} & \xleftarrow[0.7]{} & \Large{\enclose{circle}{I}} & \xleftarrow[0.8]{} & \Large{\enclose{circle}{J}}\\
\circlearrowright\tfrac12\\
\end{array}
$$
The rest
As this post won’t be published on meta, having the link to ASCIIFlow is enough.