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Cobos, Fernando and Fernández-Martínez, Pedro
(1995)
*Dependence on Parameters in Interpolation Methods Associated to Polygons.*
Bollettino della Unione Matematica Italiana, 9B
(2).
pp. 339-357.
ISSN 0041-7084

URL | URL Type |
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http://umi.dm.unibo.it/ | Organisation |

## Abstract

A theorem due to S. Janson, P. Nilsson, J. Peetre and M. Zafran [Proc. Lond. Math. Soc., III. Ser. 48, 283-299 (1984; Zbl 0532.46046)] states that for a Banach couple A such that _(A) is not closed in _(A) the real interpolation spaces A_,q and A_,p coincide if and only if _ = _ and p = q. Here the analogous problem for N-tuples of Banach spaces is investigated. It is assumed that the N-tuple A satisfies a certain condition "(A) which ensures that the J- and the K-methods with respect to a polygon _ coincide. Also, it is assumed that _(A) is not closed in _(A).

The authors prove the following results:

(1) If P,Q 2 int _ and AP,p = AQ,q, then p = q.

(2) If P, Q,R 2 int _ and AP,q = AQ,q = AR,q, then P, Q and R are affinely dependent.

Item Type: | Article |
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Uncontrolled Keywords: | Real interpolation method defined by a polygon; real interpolation spaces |

Subjects: | Sciences > Mathematics > Numerical analysis |

ID Code: | 15476 |

Deposited On: | 05 Jun 2012 09:22 |

Last Modified: | 21 Oct 2013 17:20 |

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