title: How to turn on capitals without pressing CAPS LOCK in vim insert mode
body: <p>I'm working with vim. I don't have remaped CAPS LOCK, nor I have activated it.
  Yet, after I type <code>\ac{DC}</code> in insert mode, Vim turns on capitals. I have a hard time turning it off since I don't understand what's causing it (toggling CAPS LOCK won't work).</p>
  
  <p>I'm baffled as to why, so I'd like to understand how can one turn on (and off) capital writing in insert mode without touching CAPS LOCK.
  Thanks.</p>