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!

Index notation

  1. May 12, 2012 #1
    Hello world,

    Index notation is driving me crazy: why on Earth is ∂_i 1/r = -x_i/r^3 ?

    I would expect it to be -x_i/r^2...

    Thanks for commenting
     
  2. jcsd
  3. May 12, 2012 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    welcome to pf!

    hello ellocomateo! welcome to the world! :smile:

    (try using the X2 and X2 buttons just above the Reply box :wink:)

    ∂r/∂x = … ? :wink:
     
  4. May 12, 2012 #3
    Oh, you mean chain rule and ∂r/∂i=xi/r
    Thanks!
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...
Similar Threads for Index notation Date
I Notation (index notation) Mar 18, 2016
Matrix multiplication: index / suffix notation issues! Apr 11, 2013
Division using index notation Sep 21, 2012
List of index notation properties ? Nov 20, 2009
Index Notation Aug 25, 2009