Math & Emoji

MathJax inline + display, GitHub emoji shortcodes, footnotes.

Math & Emoji#

Inline math#

The Pythagorean theorem is $a^{2} + b^{2} = c^{2}$ and the quadratic formula is $x = \frac{- b \pm \sqrt{b^{2} - 4 a c}}{2 a}$ . Inline math sits naturally in running prose.

Display math#

A few set-piece equations:

e^{i π} + 1 = 0

\int_{- \infty}^{\infty} e^{- x^{2}} d x = \sqrt{π}

\frac{\partial}{\partial t} Ψ (x, t) = - \frac{ℏ^{2}}{2 m} \frac{\partial^{2}}{\partial x^{2}} Ψ (x, t) + V (x) Ψ (x, t)

A matrix:

A = (\begin{matrix} a_{11} & a_{12} & a_{13} \\ a_{21} & a_{22} & a_{23} \\ a_{31} & a_{32} & a_{33} \end{matrix})

Emoji#

The markdown-it-emoji plugin maps GitHub shortcodes to unicode glyphs:

🚀 launch
✨ shiny things
✅ success
❌ failure
⚠️ heads up
🎉 ship-it
📝 notes
🐛 bug
🔧 tools
📚 docs

Footnotes#

The first footnote links down to the references section. Multiple footnotes can co-exist in the same paragraph .

Mixed: math inside a callout#

Inline math works inside containers too: the variance of a random variable $X$ is $Var (X) = E [X^{2}] - E [X]^{2}$ .

Mixed: math inside a code block#

Math inside a code fence is intentionally NOT rendered — it stays as raw source. This is correct behaviour; you want code to look like code:

$E = mc^2$ — not rendered as math, displayed as the literal source string.

A short footnote.

Footnotes support bold, italics, code, and links.

A longer footnote that spans multiple sentences. The numbering is automatic so authors don’t have to track indices by hand. Use named refs like [^name] so re-ordering doesn’t renumber visible links.