Subscript spacing using knitr and RStudio Markdown

Question

I've created and RMarkdown file in RStudio. I've inserted this code in my RMarkdown file.

$$\begin{align*}
\sum_{k=1}^n c x_k
&=cx_1+cx_2+\cdots+cx_n\\
&=c(x_1+x_2+\cdots+x_n)\\
&=c\sum_{k=1}^nx_k
\end{align*}$$

Compiling with knitHTML, I get the following image.

Note how the subscript k is crammed too tightly against x. Of course, I can try:

c x_{\\,k}

but then it is a bit too far. I am wondering why the code x_k doesn't work the spacing as it does normally in latex.

Any suggestions?

D.

PS For those wanting the RMarkdown source and resulting html file:

CovarianceAndCorrelation.Rmd

CovarianceAndCorrelation.html

Answer 1

It's quite easy. Take H2O for example. Implement the following code: H~2~o