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(x, t)
D
(0, t − x/c)
(x − ct, 0) (ct − x, 0) (x + ct, 0)
Figure 6.5: The shaded region D for double integral in (6.18)
(see Figure 6.6).
(x, t)
(0, t − x/c) (l, t + x/c − l/c)
(0, t + x/c − 2l/c) (l, t − x/c − l/c)
(l, t + x/c − 3l/c)
-2l -l l 2l 3l 4l
4l − x − ct
x − ct x − ct + 2l x + ct
Figure 6.6: The domain for a finite interval (0; l)
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