Talk:Calculus/Partial differential equations

Has anyone else checked all this (to date) for clarity, appropriate scope, algebraic errors etc? More, and better, diagrams and examples would probably be helpful too. Carandol 20:27, 14 Jul 2004 (UTC)

Hi all, I have a basic doubt about calculus, in partial differential Equations. ie how to solve a PDE of two or More functions. for eg
 * $$ \frac{1}{r} \frac {\partial (r*u(r)*psi(r)*rho)}{\partial r}$$


 * Extend the methods used for systems of ODE's. If the PDE's are linear, for example, it may be possible to eliminate one function and get a single PDE of higher order. Carandol

Problem
Hi, I found this site very intersting. I still have a problem: I don't know how to solve an hyperbolic partial differential equation like:

f(x)D^2g(x,t)/Dx^2 - D^2g(x,t)/Dt^2= 0,

where f(x) is a positive real continuous function. Can anybody help me please? Thanks a lot,

Cris

Page Layout for Computer Monitors
It is an amazing fact that here we are, thirty years into personal computing, and we still handle text as though a page were 8.5 inches by 11. We haven't noticed that the computer screen is generally 3x4 in aspect ratio, with 12 x 16, the extended screen, on the horizon. Seems to me a simple thing follows: text should generally be formatted in 3x4 ratio chunks, and all the stuff around the margins -- headers, logos for the source organization, "print," "bulletin board" and all those other allied services --  jammed into a single pop-up box that could be accessed by clicking on an inconspicuous switch in the corner of the screen. -dlj.