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I would like to understand what the first paragraph after 3 on page 40 is saying, because I want to understand the set up of the first initial-boundary value problem which follows.

Suppose if we have just x and t and a 2 dimensional problem.

Suppose we take D to be a strip.

$D=[T_1, T_2]\times \Omega$

What would be the $B, B_T, S$ here? Also a more complicated example would also be appreciated.

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