We could use diagonal arrows for the odd-numbered diagrams:

- `\searrow` produces an arrow pointing to south east \\(\searrow\\)

- `\swarrow` produces an arrow pointing to south west \\(\swarrow\\)

- `\nearrow` produces an arrow pointing to north east \\(\nearrow\\)

- `\nwarrow` produces an arrow pointing to north west \\(\nwarrow\\)

The commuting triangle example would look like this:

\[

\begin{matrix}

X & \xrightarrow{f} & Y \\\\

& \searrow & \downarrow \\\\

& & Z

\end{matrix}

\]

Unfortunately, I don't know of an easy and nice way of labelling the diagonal arrows; maybe we can draw some inspiration from [this Maths Stackexchange thread](https://math.meta.stackexchange.com/questions/2324/how-to-draw-a-commutative-diagram).

- `\searrow` produces an arrow pointing to south east \\(\searrow\\)

- `\swarrow` produces an arrow pointing to south west \\(\swarrow\\)

- `\nearrow` produces an arrow pointing to north east \\(\nearrow\\)

- `\nwarrow` produces an arrow pointing to north west \\(\nwarrow\\)

The commuting triangle example would look like this:

\[

\begin{matrix}

X & \xrightarrow{f} & Y \\\\

& \searrow & \downarrow \\\\

& & Z

\end{matrix}

\]

Unfortunately, I don't know of an easy and nice way of labelling the diagonal arrows; maybe we can draw some inspiration from [this Maths Stackexchange thread](https://math.meta.stackexchange.com/questions/2324/how-to-draw-a-commutative-diagram).