Here is an equation.

\begin{equation} f\left(k\right) = \binom{n}{k} p^k\left(1-p\right)^{n-k} (#eq:binom) \end{equation}

You may refer to using \@ref(eq:binom), like see Equation \@ref(eq:binom).

Theorems and proofs

Labeled theorems can be referenced in text using \@ref(thm:tri), for example, check out this smart theorem \@ref(thm:tri).

::: {.theorem #tri} For a right triangle, if $c$ denotes the length of the hypotenuse and $a$ and $b$ denote the lengths of the other two sides, we have $$a^2 + b^2 = c^2$$ :::

Read more here

Callout blocks

The bs4_book theme also includes special callout blocks, like this .rmdnote.

::: {.rmdnote} You can use markdown inside a block.

head(beaver1, n = 5)


It is up to the user to define the appearance of these blocks for LaTeX output.

You may also use: .rmdcaution, .rmdimportant, .rmdtip, or .rmdwarning as the block name.

The R Markdown Cookbook provides more help on how to use custom blocks to design your own callouts:

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bookdown documentation built on Sept. 5, 2021, 5:19 p.m.