1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I Why are fractions sometimes written as such: (A/B)/C?

  1. Mar 13, 2017 #1
    In my physics courses I have seen this kind of notation several times now: $$ \frac {A/B} {C}$$

    For instance:


    To me it doesn't seem intuitive and ## \frac A {BC}## would seem like a neater way of writing it. Therefore I wonder if there's any specific reason to why people write it like this.
  2. jcsd
  3. Mar 13, 2017 #2


    User Avatar
    2017 Award

    Staff: Mentor

    Your examples have one thing in common: they describe a rate of a quantity. The quantities are normed, i.e. they are something per unit of something. The notation ##\frac{A/B}{C}## emphasizes what it is about, namely the change of a special ratio, whereas ##\frac{A}{BC}## disguises this physically important difference even if not wrong.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted