title: When to use DBL_EPSILON/epsilon
body: <p>The DBL_EPSILON/std::numeric_limits::epsilon will give me the smallest value that will make a difference when adding with one.</p>
  
  <p>I'm having trouble understanding how to apply this knowledge into something useful.</p>
  
  <p>The epsilon is much larger than the smallest value the computer can handle, so It would seem like a correct assumption that its safe to use smaller values than epsilon?</p>
  
  <p>Should the ratio between the values I'm working with be smaller than 1/epsilon ?</p>