Using D'Alembert Solution to Find Values of Regions

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SUMMARY

The discussion focuses on using D'Alembert's solution to determine the values of regions in a grid, specifically highlighting that regions containing points such as x = 0 and x = 4 should have a value of 0. It emphasizes the importance of boundary conditions in finding bottom values and raises questions about the initial condition's appearance when applied to real line problems. Understanding D'Alembert's solution for the time derivative at t=0 is crucial for interpreting the figure presented.

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FAS1998
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How were the values of the the regions found in the grid of this solution? I understand that the value should be 0 in every regions that contains the points x = 0, x=4, etc...

I believe the bottom values can be found from the boundary conditions as well, but what about the others?
 
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Do you understand why the initial condition looks the way it does when extended to a problem on the real line?

Once you have that and d’Alembert’s solution for the time derivative at t=0 being equal to zero you should be able to understand the figure.
 
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