On relations between spectral and dynamical inverse

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Utt – Au= 0 in 27 x (0,00); ult=0 = Ut|t=0 = 0; u|1x[0,00) = f, urtx[0 .... (1.5). (see [3, 71). 1.3. Dual system. Denote AT := {(x, t) ENT ~ (0,7) lt