Equations that typeset themselves

In this lesson you will learn inline and display math notation, the currency guard that keeps prices literal, and how math behaves offline and in exports.

Syntax

Inline: the energy relation $E = mc^2$ holds.

Display:

$$
\sum_{i=1}^{n} i = \frac{n(n+1)}{2}
$$

Single dollars wrap inline math inside a sentence; double dollars on their own lines make a centered display equation. Inside, standard LaTeX applies: \\frac for fractions, ^ and _ for super- and subscripts, Greek letters like \\alpha by name.

Prices stay prices

Typehall refuses to guess: a dollar sign next to a digit is money, not math. $5, $100, and $1.99 render literally, as does a trailing 5$. Escaped dollars (\$) are always literal, and unclosed expressions fall back to source text rather than half-rendering. When you genuinely want math, give the delimiters room: $E = mc^2$, not $5 + $x$.

Rendering, offline, export

• Math typesets locally in Preview with the app's bundled engine — no CDN, no remote fonts, no requests.
• After the first visit caches the app, equations render offline exactly as online.
• HTML export embeds the typeset result, so equations survive outside the app; Markdown export keeps the source notation, which GitHub and other renderers understand.
• Invalid expressions show the source text with no crash — fix the syntax and the equation appears.

The project costs $5 per seat and totals $1.99 per report.

Inline: state $E = mc^2$ in a sentence of your own.

Display: typeset this sum on its own lines:

$$
\sum_{i=1}^{n} i = \frac{n(n+1)}{2}
$$

That completes the course. The tool-side reference with notation and export details is LaTeX Markdown editor, and agent-written drafts get their own workflow at AI Markdown editor. Back to the course index anytime — or open the notepad and keep writing.