Register to reply

Determining wheter or not a non trivial solutions exists for higher order PDE's

Share this thread:
Nov7-12, 12:00 PM
P: 194
Is there a way to determine if a non trivial solution exists for higher order PDE's? For example suppose I have the following.

[itex]X''''(x) + \alpha^2X(x)=0[/itex]

With given conditions U(0,t) = u(1,t) = uxx(0,t) = uxx(1,t) = 0 if t≥0

The general solution will have 4 constants of which I will have to solve for using the above conditions. However, if this shows up on a test I will not have enough time to do this and the other parts that go along with this step. There's got to be a simple way to do this just by observation.

Note: This step is part of a process to solve the beam equation. I've done the case with λ=0 and λ<0. The case for λ>0 is where I need to find a shorter faster way. I have tried searching online for solution examples to solving this but all the solutions just jump to the case where λ<0.
Phys.Org News Partner Science news on
Study links polar vortex chills to melting sea ice
Lab unveil new nano-sized synthetic scaffolding technique
Cool calculations for cold atoms: New theory of universal three-body encounters
Nov8-12, 07:36 AM
Sci Advisor
PF Gold
P: 39,569
No, there is no "simple way to do this just by observation".
Nov8-12, 12:09 PM
P: 194
Is there any other way without going through the process of figuring out the general solution? My professor hinted that there was but I can't figure it out. Perhaps because this is a beam, the eigenvalues have to be real due to the fact that they represent the frequencies.

Register to reply

Related Discussions
Determining wheter point lie on line Linear & Abstract Algebra 4
Is it possible to have more than 'N' non-trivial solutions to an 'Nth' order DE ? Differential Equations 3
Non-trivial solutions General Math 2
Higher Order Differential Equations, Solutions related Calculus & Beyond Homework 5
Taylor's Formula in Higher Dimension/Higher order Total differentials Calculus & Beyond Homework 3