title: R markdown: fractions and subscripts without LaTex
body: <p>I am trying to write my first markdown document. Unfortunately, I have two smaller problems with markdown.</p>
  
  <p>In the general running text (aside of code phrases) I would like to embed subtexts and mathematical fraction terms. I am aware that I could use pandoc or LaTex to circumvent these issues but for the purpose of the documentation it would be unwise to use too much outside material and with LaTex the format would loose its uniformity.</p>
  
  <p>Is there an option to use subtexts and fractions simply with R?</p>
  
  <p>Best and many thanks :).</p>
  
  <p>For clarification - I would like to end up with something like that but of course not in Word but a Markdown output file:
  <a href="https://i.stack.imgur.com/vdl7h.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vdl7h.png" alt="enter image description here"></a></p>