# Strictly singular operators and the invariant subspace problem

Studia Mathematica (1999)

• Volume: 132, Issue: 3, page 203-226
• ISSN: 0039-3223

top

## Abstract

top
Properties of strictly singular operators have recently become of topical interest because the work of Gowers and Maurey in [GM1] and [GM2] gives (among many other brilliant and surprising results, such as those in [G1] and [G2]) Banach spaces on which every continuous operator is of form λ I + S, where S is strictly singular. So if strictly singular operators had invariant subspaces, such spaces would have the property that all operators on them had invariant subspaces. However, in this paper we exhibit examples of strictly singular operators without nontrivial closed invariant subspaces. So, though it may be true that operators on the spaces of Gowers and Maurey have invariant subspaces, yet this cannot be because of a general result about strictly singular operators. The general assertion about strictly singular operators is false.

## How to cite

top

Read, C.. "Strictly singular operators and the invariant subspace problem." Studia Mathematica 132.3 (1999): 203-226. <http://eudml.org/doc/216595>.

abstract = {Properties of strictly singular operators have recently become of topical interest because the work of Gowers and Maurey in [GM1] and [GM2] gives (among many other brilliant and surprising results, such as those in [G1] and [G2]) Banach spaces on which every continuous operator is of form λ I + S, where S is strictly singular. So if strictly singular operators had invariant subspaces, such spaces would have the property that all operators on them had invariant subspaces. However, in this paper we exhibit examples of strictly singular operators without nontrivial closed invariant subspaces. So, though it may be true that operators on the spaces of Gowers and Maurey have invariant subspaces, yet this cannot be because of a general result about strictly singular operators. The general assertion about strictly singular operators is false.},
journal = {Studia Mathematica},
keywords = {operator; invariant subspace; strictly singular; strictly singular operator},
language = {eng},
number = {3},
pages = {203-226},
title = {Strictly singular operators and the invariant subspace problem},
url = {http://eudml.org/doc/216595},
volume = {132},
year = {1999},
}

TY - JOUR
TI - Strictly singular operators and the invariant subspace problem
JO - Studia Mathematica
PY - 1999
VL - 132
IS - 3
SP - 203
EP - 226
AB - Properties of strictly singular operators have recently become of topical interest because the work of Gowers and Maurey in [GM1] and [GM2] gives (among many other brilliant and surprising results, such as those in [G1] and [G2]) Banach spaces on which every continuous operator is of form λ I + S, where S is strictly singular. So if strictly singular operators had invariant subspaces, such spaces would have the property that all operators on them had invariant subspaces. However, in this paper we exhibit examples of strictly singular operators without nontrivial closed invariant subspaces. So, though it may be true that operators on the spaces of Gowers and Maurey have invariant subspaces, yet this cannot be because of a general result about strictly singular operators. The general assertion about strictly singular operators is false.
LA - eng
KW - operator; invariant subspace; strictly singular; strictly singular operator
UR - http://eudml.org/doc/216595
ER -

## References

top
1. [E1] P. Enflo, On the invariant subspace problem for Banach spaces, Acta Math. 158 (1987), 212-313. Zbl0663.47003
2. [G1] W. T. Gowers, A solution to Banach's hyperplane problem, Bull. London Math. Soc. 26 (1994), 523-530. Zbl0838.46011
3. [G2] W. T. Gowers, A solution to the Schroeder-Bernstein problem for Banach spaces, ibid. 28 (1996), 297-304. Zbl0863.46006
4. [GM1] W. T. Gowers and B. Maurey, The unconditional basic sequence problem, J. Amer. Math. Soc. 16 (1993), 851-874. Zbl0827.46008
5. [GM2] W. T. Gowers and B. Maurey, Banach spaces with small spaces of operators, Math. Ann. 307 (1997), 543-568. Zbl0876.46006
6. [J1] R. C. James, A non-reflexive Banach space isometric with its second conjugate space, Proc. Nat. Acad. Sci. U.S.A. 37 (1951), 174-177. Zbl0042.36102
7. [R1] C. J. Read, A solution to the invariant subspace problem, Bull. London Math. Soc. 16 (1984), 337-401. Zbl0566.47003
8. [R2] C. J. Read, A short proof concerning the invariant subspace problem, J. London Math. Soc. (2) 33 (1986), 335-348. Zbl0664.47006
9. [R3] C. J. Read, The invariant subspace problem, a description with further applications of a combinatorial proof, in: Advances in Invariant Subspaces and Other Results of Operator Theory, Birkhäuser, 1986, 275-300.
10. [R4] C. J. Read, A solution to the invariant subspace problem on the space ${l}_{1}$, Bull. London Math. Soc. 17 (1985), 305-317. Zbl0574.47006
11. [R5] C. J. Read, The invariant subspace problem on a class of nonreflexive Banach spaces, in: Geometric Aspects of Functional Analysis, Israel Seminar (GAFA) 1986-7, Lecture Notes in Math. 1317, Springer, 1988, 1-20.
12. [R6] C. J. Read, The invariant subspace problem for a class of Banach spaces, 2: Hypercyclic operators, Israel J. Math. 63 (1988), 1-40. Zbl0782.47002
13. [R7] C. J. Read, The invariant subspace problem on some Banach spaces with separable dual, Proc. London Math. Soc. (3) 58 (1989), 583-607. Zbl0686.47010
14. [R8] C. J. Read, Quasinilpotent operators and the invariant subspace problem, J. London Math. Soc. (2) 56 (1997), 595-606.
15. [Ra1] H. Radjavi and P. Rosenthal, Invariant Subspaces, Springer, 1973. Zbl0269.47003

top

## NotesEmbed?

top

You must be logged in to post comments.

To embed these notes on your page include the following JavaScript code on your page where you want the notes to appear.

Only the controls for the widget will be shown in your chosen language. Notes will be shown in their authored language.

Tells the widget how many notes to show per page. You can cycle through additional notes using the next and previous controls.

Note: Best practice suggests putting the JavaScript code just before the closing </body> tag.