Equation Numbering in Rmd

build-script.R

library(rmarkdown)
library(knitr)
render("eqn-numbering.Rmd")

eqn-numbering.Rmd

---
title: Eqn Numbering
output: pdf_document
---


An equation with numbering

\begin{equation}
  \label{eq:1}
  \phi \left( x; \mu, \sigma \right) = \frac{1}{\sqrt{2 \pi \sigma^2}} \exp \left( -
  \frac{\left(x - \mu\right)^2}{2 \sigma^2} \right)
\end{equation}

\begin{equation}
5 = 2 + 3
\end{equation}

blah blah blah, reference equation \ref{eq:1}