Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Order of PDE

  1. Nov 14, 2009 #1
    what is the order of differential equation which contains first order in time and second order in space derivative?
  2. jcsd
  3. Nov 14, 2009 #2
    it will be the order of the highest derivative (doesn't matter in respect to what variable).
    In your case, it's a second order pde
  4. Nov 14, 2009 #3


    User Avatar
    Science Advisor

    Although it would also be perfectly acceptable to say "The differential equation is of second order in x and first order in t".
  5. Nov 15, 2009 #4
    It is a more specific classification

    But in respect to how you solve the PDE, it's only important what's the highest order.

    In this matter, how would you classify [tex]u_{xt}+blabla=0[/tex], first order in time and space, or second-order in both?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook