TeX & Mermaid
TeX
\begin{aligned}
\int_{-\infty}^{\infty} e^{-x^2}\,dx &= \sqrt{\pi} \\
\sum_{n=1}^{\infty} \frac{1}{n^2} &= \frac{\pi^2}{6}
\end{aligned}Mermaid
sequenceDiagram
autonumber
participant C as Client
participant A as API
participant K as Cache
participant D as DB
C->>+A: GET /item
A->>+K: lookup
alt cache hit
K-->>A: value
else miss
K-->>A: empty
A->>+D: SELECT
D-->>-A: row
end
A-->>-C: 200