Some Rigorous Results Concerning Spectral Theory for Ideal Mhd
Some Rigorous Results Concerning Spectral Theory for Ideal Mhd
Peter Laurence
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It is noteworthy that the boundary condition, B«n =, was not used to establish (118). Thus, from (118) we obtain 2 Re + 2 Re | c' + X, ll(L + XI)ul|2 > IILull^ + Xllul|2 . (124) Moreover, an elementary calculation using the system (77-80) establishes that for X^ sufficiently large there exists d and X so that, if X > Xq llLul|2 + Xllull2 s d{ll-Vp + VxBxB^^||2 + IIV X (vxBq||2 + llV«vl|2 + Xllul|2} (125) We define L_ = L + XI, ^ > ^o X -35- It is clear from the inequality (124) that the norm ...llL_u II is equivalent to the graph norm {IIL_ull^ + llull^}^'^ on D"*" and thus on the closure of X D"*" in this norm. Thus to show that (113) is valid on all of D(L_) we X need merely to show that D"^ is dense in D. For now, assume we have proved this. We are then in a position to conclude the proof that L_ X is a closed operator. Suppose that (u^, L_Uj^) is a Cauchy sequence in the graph norm. X Since X is complete, there exist u, V such that u^ ->■ u, Vj^ = L^Uj^ ->• V.
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