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# Differential Equation : Space Factor, Time Factor, Eigenvalues and Sturm-Liouville

7. Consider the differential equation
ut =1/2 uxx + ux for 0 <x < pi, t > 0
with boundary conditions
u(0,t) = u(pi,t) = 0.
(a) Separate variables and write the ordinary differential equations that the space factor X(x) and the time factor T(t) must satisfy.
(b) Show that 0 is not an eigenvalue of the Sturm-Liouville problem for X.
(c) Show that for any integer n>1,
Xn(x) = e^-x sinnx
is an eigenfunction of the Sturm-Liouville problem for X and determine the corresponding eigenvalue.
(d) Assuming that these are all the eigenvalues, write down in series form the general solution of the boundary value problem above assuming a general initial condition u(x, 0) = f(x).

Please see the attached file for the fully formatted problems.

#### Solution Summary

A Differential Equation is investigated with regard to Space Factor, Time Factor, Eigenvalues and Sturm-Liouville problem. The solution is detailed and well presented. The response was given a rating of "5" by the student who originally posted the question.

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