By Ivan N. Erdelyi, Wang Shengwang

This e-book, that's virtually solely dedicated to unbounded operators, offers a unified remedy of the modern neighborhood spectral concept for unbounded closed operators on a posh Banach area. whereas the most a part of the booklet is unique, useful history fabrics supplied. There are a few thoroughly new issues taken care of, corresponding to the whole spectral duality conception with the 1st accomplished evidence of the predual theorem, in assorted types. additionally lined are spectral resolvents of assorted forms (monotomic, strongly monotonic, virtually localized, analytically invariant), and spectral decompositions with recognize to the identification. The ebook concludes with an intensive reference record, together with many papers released within the People's Republic of China, the following delivered to the eye of Western mathematicians for the 1st time. natural mathematicians, in particular these operating in operator idea and sensible research, will locate this ebook of interest.

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14) imply Ty = TR(A;A)x = R(A;A)Tx e YA and hence YA e Inv T. Y)x, x e Y n VT. 15) a(TI\) = a(TIY). 15) implies that YA c Y. AI > I! , Y is invariant under R(A;A). It follows from A= lim A[AR(A;A) - I], A~oo that Y is invariant under A. 24. PROPOSITION. Given T, every spectral maximal space ofT and each T-bounded spectral maximal space is T-absorbent. 26 PROOF. We confine the proof to a spectral maximal space Y of T. Fix Yo e Y and AO e cr(TJY). Suppose, to the contrary, that there is a solution x0 ~ Y of equation (A 0-T)x 0 = y 0 • The subspace Z = {z eX : z = y + ax 0 , y e Y, a e ~} is invariant under T.

13) holds. 14. THEOREM. X(T,G)] c G n o(T). PROOF. Let A e G n o(T). Choose {G 0 ,G 1} e cov o(T) with G0 e V"", Gl e GK, A~ -G0 and A e Gl C: G. By the 1-SDP, X= X(T,G0 ) + ~(T,G1 ) = X(T,G0) + X(T,G1 ) = X(T,G0 ) + X(T,G). X(T,G)]. X(T,G)]. 32concludes the proof. 15. LEMMA. aJr. X 1 e B(X 1). X 0 is densely defined. X(T,F) is densely defined in X(T,F). 00 PROOF. X 0. 16) (a) Yn + y; (b) Tyn + z. 10, there is M> 0 such that each Yn representation has a 41 satisfying condition (5. 18) Yni Y;, Y; eX; + Tyno Then (i=O,l ).

12, the direct sum ::::(T,G"1 )(~)X[T,cr(TjY)] is closed. Since Y cX[T,cr(TjY)], the direct sum ::::(T,G"1)(±)Y is also closed. 22) implies the decomposition X/Y = X(T,G0 )/Y + [:::(T,G1)(±)Y]/Y where, clearly, the quotient spaces X(T,G0 )/Y, [;:;(T,G1 )(±)Y]/Y are closed. 1. 15 implies that Tis closed. Next, assume that Y e SM(T). is closed. e. cr(TjY) is compact), then T is closed, by the previous part of the proof. 20) for Y e SM(T) or Y e SMb(T), first suppose that cr(T) - cr(TjY) 1 t. Let G0 e V00 with G"0 ~ t be an open neighborhood of cr(T) - cr(TjY) and let G1 be relatively compact such that {G 0,G 1} e cov cr(T) and G1 n cr(T) - cr(TjY) = 0.