Why does where its defined on matter?

for example i have the wave equation defined between 0< = x <= inf

then i have to do it again but between 0< = x <= pi

The first one only has inital conidtions and no boundary conditions, is this the reason?

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- Dec 15th 2010, 11:22 AMadam_leedsWave and Heat equations
Why does where its defined on matter?

for example i have the wave equation defined between 0< = x <= inf

then i have to do it again but between 0< = x <= pi

The first one only has inital conidtions and no boundary conditions, is this the reason?