Download e-book for kindle: Advanced calculus; a text upon select parts of differential by Edwin Bidwell Wilson

By Edwin Bidwell Wilson

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Extra info for Advanced calculus; a text upon select parts of differential calculus, differential equations, integral calculus, theory of functions; with numerous exercises

Example text

On the other hand, if u G V{T)DN, then Pit = 0 and PTw = TPu = TO = 0, so Tit G iV and N is invariant under T. • The next theorem and corollary are elementary, and the proofs are left as exercises for the reader. Note that if T is reduced by the pair (M, TV), then so is XI — T for each scalar A. 12. Let T be a closed linear operator in H which is reduced by the pair (M, N), and let TM = T \ V{T) n M and TN = T | V{T) n N. Then TM and TN are closed linear operators in M and N, respectively, and (a) V{T) = V{TM)®V{TN) {algebraic direct sum).

And (T*)n, n = 0,1, 2 , . . , are Fredholm operators in H with (T n )* = (T*) n for n = 0 , 1 , 2 , . . In addition, if i(T) = 0, then i{Tn) = z((T*) n ) = 0 for n = 0,1, 2 , . . To conclude this section of basic properties, we turn to the perturbation theory of Fredholm operators. Again let H and Hi be complex Hilbert spaces, and let T be a closed linear operator from H to Hi. We know that the domain V(T) becomes a Hilbert space under the graph norm structure (u,v)T \\u\\T = ( « , i 4 / 2 = [ N | 2 + ||Tw|| 2 ] 1 / 2 .

If M and TV are closed subspaces in H with H = M Q) N (topological direct sum) and if P is the projection of H onto M along TV, then T is said to be reduced by the pair (M, TV) in case M and TV are both invariant under T and PV(T) QV(T). In this situation, I - P is the projection of H onto TV along M, (/ - P)V(T) C £>(T), and we can form the two restrictions TM = T | V(T) DM and TN = T \ V(T) n TV. 11. Let T be a closed linear operator in H, and let H = M 0 TV be a topological direct sum decomposition with P the projection of H onto M along TV.

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