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COMPACT FACTORIZATION OF OPERATORS WITH λ-COMPACT ADJOINTS

Published online by Cambridge University Press:  20 March 2017

ANTARA BHAR
Affiliation:
School of Mathematical Sciences, National Institute of Science Education and Research, Bhimpur, Padanpur via Jatni, Khurda-752050, India e-mails: antara.music@gmail.com, anilkarn@niser.ac.in
ANIL K. KARN
Affiliation:
School of Mathematical Sciences, National Institute of Science Education and Research, Bhimpur, Padanpur via Jatni, Khurda-752050, India e-mails: antara.music@gmail.com, anilkarn@niser.ac.in
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Abstract

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Let λ be a symmetric, normal sequence space equipped with a k-symmetric, monotone norm ‖.‖λ. Also, assume that (λ, ‖.‖λ) is AK-BK. Corresponding to this sequence space λ, we study compactness of the operator ideal Kλ. We proved compactness, completeness and injectivity of the dual operator ideal Kλd. We also investigate the factorization of these operators.

Type
Research Article
Copyright
Copyright © Glasgow Mathematical Journal Trust 2017 

References

REFERENCES

1. Ain, K., Lillemets, R. and Oja, E., Compact operators which are defined by lp -spaces, Quaest. Math. 35 (2012), 145159.Google Scholar
2. Defant, A. and Floret, K., Tensor norms and operator ideals (North Holland Mathematics Studies 176: North-Holland, Amsterdam, 1993).Google Scholar
3. Delgado, J. M., Piñeiro, C. and Serrano, E., Operators whose adjoints are quasi-p-nuclear, Studia Math. 197 (3) (2010), 291304.Google Scholar
4. Diestel, J., Jarchow, H. and Tonge, A., Absolutely summing operators (Cambridge Stud. Adv. Math., vol 43, Cambridge Univ. Press, Cambridge, 1995).Google Scholar
5. Grothendieck, A., Produits tensoriels topologiques et espaces nucléaires, Memo. Amer. Math. Soc. 16 (1955).Google Scholar
6. Gupta, M. and Bhar, A., On λ-compact operators, Indian J. Pure Appl. Math. 44 (3) (2013), 355374.Google Scholar
7. Kamthan, P. K. and Gupta, M., Sequence Spaces and Series, Lecture Notes in Pure and Applied Mathematics, vol. 65 (Marcel Dekker, Inc., New York, 1981).Google Scholar
8. Karn, A. K. and Sinha, D. P., Compactness and an approximation property related to an operator ideal, arXiv:1207.1947.Google Scholar
9. Lindenstrauss, J., Extension of compact operators, Mem. Amer. Math. Soc. 48 (1964).Google Scholar
10. Lindenstrauss, J. and Tzafriri, L., Classical Banach spaces - sequence spaces (Springer-Verlag, Berlin, 1977).Google Scholar
11. Ortel, F., Composition of operator ideals and their regular hulls, Acta. Univ. Carolin. Math. Phys. 36 (1995), 6972.Google Scholar
12. Pietsch, A., Operator Ideals (North Holland Mathematical Library 20, North Holland Publishing Company: North Holland, Amsterdam, 1980).Google Scholar
13. Pietsch, A., The ideal of p-compact operators and its maximal hull, Proc. Amer. Math. Soc. 142 (2014), 519530.Google Scholar
14. Ramanujan, M. S., Generalized nuclear maps in normed linear spaces, J. Reine Angew Math. 244 (1970), 190197.Google Scholar
15. Ramanujan, M. S., Absolutely λ-summing operators, λ a symmetric sequence space, Math Z. 144 (1970), 187193.Google Scholar
16. Sinha, D. P. and Karn, A. K., Compact operators whose adjoints factor through subspaces of lp , Studia Math. 150 (2002), 1733.CrossRefGoogle Scholar
17. Sinha, D. P. and Karn, A. K., Compact operators which factor through subspaces of lp , Math. Nachr. 281 (2008), 412423.CrossRefGoogle Scholar
18. Stephani, I., Generating systems of sets and quotients of surjective operator ideals, Math. Nachr. 99 (1980), 1327.Google Scholar
19. Walker, G. R., Compactness of λ-nuclear operators, Michigan Math. J. 23 (1976), 167172.Google Scholar
20. Zippin, M., Extension of bounded linear operators, in Handbook of geometry of Banach spaces, vol. 2 (Johnson, W. B. and Lindenstrauss, J., Editors) (Elsevier, North Holland, Amsterdam, 2003), 17031741.Google Scholar