A Short Note on LaTeX Math in Jekyll

June 26, 2026

This is a small example post showing how to write math in Markdown and render it with MathJax on the website.

Inline equations work with dollar signs, such as $E = mc^2$ or $p_\theta(y \mid x)$.

Block equations use double dollar signs:

\[\mathcal{L}(\theta) = -\sum_{i=1}^{N} y_i \log p_\theta(y_i \mid x_i).\]

You can also write multi-line derivations:

\[\begin{aligned} \nabla_\theta \mathcal{L}(\theta) &= -\sum_{i=1}^{N} y_i \nabla_\theta \log p_\theta(y_i \mid x_i) \\ &= -\sum_{i=1}^{N} \frac{y_i}{p_\theta(y_i \mid x_i)} \nabla_\theta p_\theta(y_i \mid x_i). \end{aligned}\]

Code blocks still work as usual:

import math

def softmax_score(logit):
    return math.exp(logit)

For future posts, copy this file into _posts/, rename it with the YYYY-MM-DD-title.md pattern, and set math: true only when the post needs LaTeX rendering.