This is an announcement for the paper "On dominated polynomials between
Banach spaces" by Geraldo Botelho, Daniel Pellegrino and Pilar Rueda.
Abstract: In this paper, among other results, we prove a conjecture
concerning coincidence theorems for dominated polynomials. We also
obtain an abstract version of Pietsch Domination Theorem (PDT) which
unifies and generalizes several different nonlinear approaches; our
result recovers, as a particular case, the well-known PDT for dominated
multilinear mappings.
Archive classification: math.FA
Mathematics Subject Classification: 46B15; 46G25
Remarks: 10 pages
The source file(s), conjecture19agosto2008-arxiv.tex: 34210 bytes, is(are)
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Submitted from: dmpellegrino(a)gmail.com
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This is an announcement for the paper "Hyperinvariant subspace for
weighted composition operator on $L^p([0,1]^d)$" by George Androulakis
and Antoine Flattot.
Abstract: The main result of this paper is the existence of a
hyperinvariant subspace of weighted composition operator $Tf=vf\circ\tau$
on $L^p([0,1]^d)$, ($1 \leq p \leq \infty$) when the weight $v$ is in
the class of ``generalized polynomials'' and the composition map is a
bijective ergodic transform satisfying a given discrepancy. The work is
based on the construction of a functional calculus initiated by Wermer
and generalized by Davie.
Archive classification: math.FA
Mathematics Subject Classification: 47A15 ; 47A10; 47A60
The source file(s), WCO.tex: 48622 bytes, is(are) stored in gzipped
form as 0809.4429.gz with size 14kb. The corresponding postcript file
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Submitted from: giorgis(a)math.sc.edu
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This is an announcement for the paper "Coincidences for multiple summing
mappings" by Geraldo Botelho and Daniel Pellegrino.
Abstract: In this note we prove new coincidence results for multiple
summing mappings, related to the cotypes of the Banach spaces involved.
Archive classification: math.FA
Remarks: 3 pages, to appear in the resumes of the meeting ENAMA, Second
The paper may be downloaded from the archive by web browser from URL
http://front.math.ucdavis.edu/0809.4171
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This is an announcement for the paper "The group of isometries of a
Banach space and duality" by Miguel Martin.
Abstract: We construct an example of a real Banach space whose group
of surjective isometries has no uniformly continuous one-parameter
semigroups, but the group of surjective isometries of its dual contains
infinitely many of them. Other examples concerning numerical index,
hermitian operators and dissipative operators are also shown.
Archive classification: math.FA
Mathematics Subject Classification: Primary: 46B04. Secondary: 46B10,
46E15, 47A12
Remarks: To appear in J. Funct. Anal.
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This is an announcement for the paper "Banach spaces of bounded Szlenk
index II" by D. Freeman, E. Odell, Th. Schlumprecht, and A. Zsak.
Abstract: For every $\alpha<\omega_1$ we establish the existence of a
separable Banach space whose Szlenk index is $\omega^{\alpha\omega+1}$
and which is universal for all separable Banach spaces whose Szlenk-index
does not exceed $\omega^{\alpha\omega}$. In order to prove that result
we provide an intrinsic characterization of which Banach spaces embed
into a space admitting an FDD with upper estimates.
Archive classification: math.FA math.AG
Mathematics Subject Classification: 46B20, 54H05
The source file(s), szlenkII_new.tex: 57543 bytes, is(are) stored in
gzipped form as 0809.3626.gz with size 17kb. The corresponding postcript
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Submitted from: schlump(a)math.tamu.edu
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This is an announcement for the paper "The vector-valued non-homogeneous
Tb theorem" by Tuomas Hytonen.
Abstract: The paper gives a Banach space-valued extension of the ``\(Tb\)
theorem'' of Nazarov, Treil and Volberg (2003) concerning the boundedness
of singular integral operators with respect to a measure \(\mu\),
which only satisfies an upper control on the size of balls. Under the
same assumptions as in their result, such operators are shown to be
bounded on the Bochner spaces \(L^p(\mu;X)\) of functions with values
in \(X\) --- a Banach space with the unconditionality property of
martingale differences (UMD) and a certain maximal function property,
which holds for all typical examples of UMD spaces. The new proof deals
directly with all \(p\in(1,\infty)\) and relies on delicate estimates
for the non-homogenous ``Haar'' functions, as well as McConnell's (1989)
decoupling inequality for tangent martingale differences.
Archive classification: math.FA math.CA
Mathematics Subject Classification: 42B20;42B25; 46B09; 46E40; 60G46
Remarks: 40 pages, submitted for publication
The source file(s), nonhomog.tex: 143196 bytes, is(are) stored in gzipped
form as 0809.3097.gz with size 39kb. The corresponding postcript file
has gzipped size 209kb.
Submitted from: tuomas.hytonen(a)helsinki.fi
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This is an announcement for the paper "Commutators on $\ell_1$" by
Detelin Dosev.
Abstract: The main result is that the commutators on $\ell_1$ are
the operators not of the form $\lambda I + K$ with $\lambda\neq
0$ and $K$ compact. We generalize Apostol's technique (1972,
Rev. Roum. Math. Appl. 17) to obtain this result and use this
generalization to obtain partial results about the commutators on
spaces $\X$ which can be represented as $\displaystyle \X\simeq \left
( \bigoplus_{i=0}^{\infty} \X\right)_{p}$ for some $1\leq p<\infty$
or $p=0$. In particular, it is shown that every compact operator
on $L_1$ is a commutator. A characterization of the commutators on
$\ell_{p_1}\oplus\ell_{p_2}\oplus\cdots\oplus\ell_{p_n}$ is given. We
also show that strictly singular operators on $\linf$ are commutators.
Archive classification: math.FA
Mathematics Subject Classification: 47B47
Remarks: 17 pages. Submitted to the Journal of Functional Analysis
The source file(s), Commutators_l1.tex: 58728 bytes, is(are) stored in
gzipped form as 0809.3047.gz with size 16kb. The corresponding postcript
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Submitted from: ddosev(a)gmail.com
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This is an announcement for the paper "Asymptotic unconditionality"
by S. R. Cowell and N. J. Kalton.
Abstract: We show that a separable real Banach space embeds almost
isometrically in a space $Y$ with a shrinking 1-unconditional basis if
and only if $\lim_{n \to \infty} \|x^* + x_n^*\| = \lim_{n \to \infty}
\|x^* - x_n^*\|$ whenever $x^* \in X^*$, $(x_n^*)$ is a weak$^*$-null
sequence and both limits exist. If $X$ is reflexive then $Y$ can be
assumed reflexive. These results provide the isometric counterparts of
recent work of Johnson and Zheng.
Archive classification: math.FA
Mathematics Subject Classification: 46B03; 46B20
Remarks: 26 pages. Submitted for publication. This is a replacement
The paper may be downloaded from the archive by web browser from URL
http://front.math.ucdavis.edu/0809.2294
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This is an announcement for the paper "Slicely countably determined
Banach spaces. Applications to the Daugavet and the alternative Daugavet
equations" by Antonio Aviles, Vladimir Kadets, Miguel Martin, Javier Meri,
and Varvara Shepelska.
Abstract: We introduce the class of slicely countably determined Banach
spaces which contains in particular all spaces with the RNP and all
spaces without copies of $\ell_1$. We present many examples and several
properties of this class. We give some applications to Banach spaces with
the Daugavet and the alternative Daugavet properties, lush spaces and
Banach spaces with numerical index $1$. In particular, we show that the
dual of a real infinite-dimensional Banach with the alternative Daugavet
property contains $\ell_1$ and that operators which do not fix copies
of $\ell_1$ on a space with the alternative Daugavet property satisfy
the alternative Daugavet equation.
Archive classification: math.FA
Mathematics Subject Classification: Primary 46B20. Secondary 46B03,
46B04, 46B22, 47A12
The source file(s), AvilesKadetsMartinMeriShepelska.tex: 107489 bytes,
is(are) stored in gzipped form as 0809.2723.gz with size 30kb. The
corresponding postcript file has gzipped size 172kb.
Submitted from: mmartins(a)ugr.es
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This is an announcement for the paper "General Lp affine isoperimetric
inequalities" by Christoph Haberl and Franz E. Schuster.
Abstract: Sharp Lp affine isoperimetric inequalities are established
for the entire class of Lp projection bodies and the entire class of Lp
centroid bodies. These new inequalities strengthen the Lp Petty projection
and the Lp Busemann--Petty centroid inequality.
Archive classification: math.DG math.FA
Mathematics Subject Classification: 52A40; 52A39
The source file(s), Lpaffine.tex: 76896 bytes, is(are) stored in gzipped
form as 0809.1995.gz with size 20kb. The corresponding postcript file
has gzipped size 116kb.
Submitted from: franz.schuster(a)tuwien.ac.at
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