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book/basic-features/equations.md

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+# Equations
+
+Equations can be included in two ways: inline or display mode. To make an inline equation, just put the LaTeX equation between \$-signs. For example, `$F = m \cdot a$` produces: $F = m \cdot a$. 
+
+Display mode equations (the ones that take up a whole line), can be inserted using double \$-signs, like this:
+
+    $$
+        F = m \cdot a
+    $$
+
+which will produce:
+
+$$
+    F = m \cdot a
+$$
+
+> **Warning**
+> 
+> Make sure there is a blank line *before* the display mode equations, otherwise it will render as inline and display the outer set of $$$ symbols. Also, the Euro symbol is not included in MathJax (see note below) and must be specified using `\unicode{0x20AC}` (note that it displays incorrectly in some Markdown renderers like VS Code).
+
+To number the equations and refer in text, you need to provide a label to the equation. Just put the label between brackets and place it after the last \$\$, like this:
+
+    $$
+        F = m \cdot a
+    $$ (newtons_second_law)
+
+> **Note**
+> 
+> The Jupyter Book uses MathJax to display equations, which provides some LaTeX-like functionality, but not all! For example, the Euro symbol is missing, and packages like `siunitx` are not available (hint, use `\textrm{}` and `\textrm{}`). When something is not working, it's useful to search for MathJax-specific solutions (hint, include "mathjax" in your Google search).
+>