Euler differential equations. I have following three equations u′′-2u=-2v

tophergopher3wo

tophergopher3wo

Answered question

2022-09-08

Euler differential equations
I have following three equations
u 2 u = 2 v
u ( 0 ) = 0
u ( 1 ) = 0
and from these 3 equations I am trying to find u(v).
It looks to me "Cauchy-Euler Differential Equations - Nonhomogeneous case" but I am not sure about that because it is not an exactly Cauchy form. Could you help me to figure out u(v)?

Answer & Explanation

enreciarpv

enreciarpv

Beginner2022-09-09Added 18 answers

Step 1
The solution to the homogeneous case is
u c ( v ) = c 1 e 2 v + c 2 e 2 v and by inspection, we observe that a particular solution is u p ( v ) = v so the solution to the general case is
u ( v ) = c 1 e 2 v + c 2 e 2 v + v. Then,
u ( 0 ) = 0 c 1 + c 2 = 0
u ( 1 ) = 0 2 c 1 e 2 2 c 2 e 2 + 1 = 0
Step 2
from which
c 1 = 1 2 e 2 + 2 e 2  
and
c 2 = 1 2 e 2 + 2 e 2
Now u ( v ) = u c ( v ) + u p ( v )

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