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PDE Differentiating Integrals

  • Thread starter moo5003
  • Start date
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1. Homework Statement

U is a function of x and t

d/dt(U) = d/dx(U) + V(x,t)U
U(x,0) = f(x)

Suppose:
U(x,t) = e^(Integral from 0 to 1 [V(x+s,t-s)]ds) * f(x+t)

Show directly (no change of variables) that this solves the above PDE
Show using change of variables that this solves the above PDE letting
Alpha = x+t
Gamma = x-t

3. The Attempt at a Solution

My main question is how to evlauate d/dt { Integral from 0 to 1 [V(x+s,t-s)]ds }
 

Answers and Replies

D H
Staff Emeritus
Science Advisor
Insights Author
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Use the Liebniz integral rule, described in these articles at http://en.wikipedia.org/wiki/Leibniz_integral_rule" [Broken].
 
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