asis-nodes.md
In tinkr: Cast '(R)Markdown' Files to 'XML' and Back Again

mal-formed inline math throws an informative error

Inline math delimiters are not balanced.

HINT: If you are writing BASIC code, make sure you wrap variable
      names and code in backtics like so: `INKEY$`.

Below are the pairs that were found:
           start...end
           -----...---
 Give you $2 to ... me what INKEY$ means.
 Give you $2 to ... 2$ verbally.
We write $2 but ...

block math can be protected

Code
  show_user(m$protect_math()$tail(48), force = TRUE)
Output
  $$
  \begin{align} % This mode aligns the equations to the '&=' signs
  \begin{split} % This mode groups the equations into one.
  \bar{r}_d &= \frac{\sum\sum{cov_{j,k}}}{
                     \sum\sum{\sqrt{var_{j} \cdot var_{k}}}} \\
            &= \frac{V_O - V_E}{2\sum\sum{\sqrt{var_{j} \cdot var_{k}}}}
  \end{split}
  \end{align}
  $$
  ```

  $$
  \begin{align} % This mode aligns the equations to the '&=' signs
  \begin{split} % This mode groups the equations into one.
  \bar{r}_d &= \frac{\sum\sum{cov_{j,k}}}{
  \sum\sum{\sqrt{var_{j} \cdot var_{k}}}} \
  &= \frac{V_O - V_E}{2\sum\sum{\sqrt{var_{j} \cdot var_{k}}}}
  \end{split}
  \end{align}
  $$

  When $a \ne 0$, there are two solutions to $ax^2 + bx + c = 0$ and they are

  ```latex
  $$
  x = {-b \pm \sqrt{b^2-4ac} \over 2a}
  $$
  ```

  $$
  x = {-b \pm \sqrt{b^2-4ac} \over 2a}
  $$

  Below is an example from [https://github.com/ropensci/tinkr/issues/38](https://github.com/ropensci/tinkr/issues/38)
  $\frac{\sum _{i=N-n}^{N}Q_i} {\sum_{j=N-n}^{N}{(\frac{C_j+C_{j-1}}2)}}$

  ```latex
  $$
  Q_{N(norm)}=\frac{C_N +C_{N-1}}2\times 
  \frac{\sum _{i=N-n}^{N}Q_i} {\sum_{j=N-n}^{N}{(\frac{C_j+C_{j-1}}2)}}
  $$
  ```

  $$
  Q_{N(norm)}=\frac{C_N +C_{N-1}}2\times
  \frac{\sum _{i=N-n}^{N}Q_i} {\sum_{j=N-n}^{N}{(\frac{C_j+C_{j-1}}2)}}
  $$

tick boxes are protected by default

Code
  show_user(m$head(15), force = TRUE)
Output
  ---
  title: An example with math elements
  ---

  This is cheap, it only costs 10$!

  This example has $\LaTeX$ elements embedded in the
  text. It is intended to demonstrate that m $\alpha_\tau$ h
  mode can work with tinkr. $y =
  mx + b$

  - [ ] This is an empty checkbox
  - [x] This is a checked checkbox
  - [This is a link](https://ropensci.org)
  - \[this is an example\]