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!

Homework Help: Div, grad, curl question

  1. Apr 14, 2013 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations

    3. The attempt at a solution

    For part (c), I showed that the tripple cross product = 2a using einstein notation. Then, I showed that 2∇(a.r) = 2a which is the same as LHS. I don't think this is as elegant as it can get..

    How do I prove it directly? I've looked up some operator identities:
  2. jcsd
  3. Apr 14, 2013 #2


    User Avatar
    Homework Helper

    Your method is fine. I would have done the same thing. I know what you mean though. It feels like there should be some kind of shortcut method.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted