, Consider now the solution ? = ?(t, x) of the bistable reaction-diffusion equation (3.28) ? t = d? xx + f (?), t > T 2 , x ? R, starting from ?(T 2 , x) = max(?(T 2 , x), 2?), The time T 2 , which depends on u and the other parameters of the problem, is well-defined and finite by virtue of (2.10), that is, 1 ? T 1 ? T 2 < +?
, )) := ?(t, x) (?(t, x) ? ?(t, x)) (1 ? ?(t, x)) ? f (?(t, x)) for all t ? T 2
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