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## CURRENTLY DISPLAYING:

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## Singular integral operators on 53-0153-0153-01-spaces

### Annali di Matematica Pura ed Applicata (1923 -) (1988-12-01) 153: 53-62 , December 01, 1988

### Summary

It is shown that certain singular integral operators with variable kernels leave invariant the*L*^{v,Φ}-spaces studied by Campanato, Stampacchia, Peetre and others. Our results extend Peetre's work on convolution operators.

## Existence of martingale solutions and the incompressible limit for stochastic compressible flows on the whole space

### Annali di Matematica Pura ed Applicata (1923 -) (2017-05-11): 1-29 , May 11, 2017

We give an existence and asymptotic result for the so-called finite energy weak martingale solution of the compressible isentropic Navier–Stokes system driven by some random force in the whole spatial region. In particular, given a general nonlinear multiplicative noise, we establish the convergence to the incompressible system as the Mach number, representing the ratio between the average flow velocity and the speed of sound, approaches zero.

## Meromorphic approximation theorem in a Stein space

### Annali di Matematica Pura ed Applicata (1923 -) (2005-06-01) 184: 263-274 , June 01, 2005

We prove the meromorphic version of the Weil–Oka approximation theorem in a reduced Stein space *X* and give some characterizations of meromorphically
$\mathcal{O}(X)$
-convex open sets of *X*. As an application we prove that for every meromorphically
$\mathcal{O}(X)$
-convex open set *D* of a reduced Stein space *X* with no isolated points there exists a family
$\mathcal{F}$
of holomorphic functions on *X* such that the normality domain
$D(\mathcal{F})$
of
$\mathcal{F}$
coincides with *D*.

## Double loop algebras and elliptic root systems

### Annali di Matematica Pura ed Applicata (1923 -) (2017-04-01) 196: 743-771 , April 01, 2017

In this note, we describe an elliptic root system and elliptic Weyl group, due to Saito (Publ RIMS Kyoto Univ 21:75–179, 1985), from view point of double loop algebra and its group. A natural action of the double loop group will be introduced on a trivial $$\mathbb {C}^*$$ -bundle over the space of $$\overline{\partial }$$ -connections on a $$C^\infty $$ -trivial principal bundle over an elliptic curve that would be constructed from 2-dimensional central extension of a double loop algebra. The invariant theory of the elliptic Weyl group will be also discussed.

## Semilinear delay evolution equations with measures subjected to nonlocal initial conditions

### Annali di Matematica Pura ed Applicata (1923 -) (2016-10-01) 195: 1639-1658 , October 01, 2016

We prove a global existence result for bounded solutions to a class of abstract semilinear delay evolution equations with measures subjected to nonlocal initial data of the form $$\begin{aligned} \left\{ \begin{array}{ll} \displaystyle \mathrm{d}u(t)=\{Au(t)+f(t,u_t)\}\mathrm{d}t+\mathrm{d}g(t),&{}\quad t\in \mathbf{R}_+,\\ u(t)=h(u)(t),&{}\quad t\in [\,-\tau ,0\,], \end{array}\right. \end{aligned}$$ where $$\tau \ge 0$$ , $$A:D(A)\subseteq X\rightarrow X$$ is the infinitesimal generator of a $$C_0$$ -semigroup, $$f:\mathbf{R}_+\times \mathcal {R} ([\,-\tau ,0\,];X)\rightarrow X$$ is continuous, $$g\in BV_{\mathrm{loc}}(\mathbf{R}_+;X)$$ , and $$h:\mathcal {R} _b(\mathbf{R}_+;X)\rightarrow \mathcal {R} ([\,-\tau ,0\,];X)$$ is nonexpansive.

## The minimal number of generators of a Togliatti system

### Annali di Matematica Pura ed Applicata (1923 -) (2016-12-01) 195: 2077-2098 , December 01, 2016

We compute the minimal and the maximal bound on the number of generators of a minimal smooth monomial Togliatti system of forms of degree *d* in
$$n+1$$
variables, for any
$$d\ge 2$$
and
$$n\ge 2$$
. We classify the Togliatti systems with number of generators reaching the lower bound or close to the lower bound. We then prove that if
$$n=2$$
(resp.
$$n=2,3$$
) all range between the lower and upper bound is covered, while if
$$n\ge 3$$
(resp.
$$n\ge 4$$
) there are gaps if we only consider smooth minimal Togliatti systems (resp. if we avoid the smoothness hypothesis). We finally analyze for
$$n=2$$
the Mumford–Takemoto stability of the syzygy bundle associated with smooth monomial Togliatti systems.

## Maximal subgroups of finite soluble groups in general position

### Annali di Matematica Pura ed Applicata (1923 -) (2016-08-01) 195: 1177-1183 , August 01, 2016

For a finite group *G* we investigate the difference between the maximum size
$${{\mathrm{MaxDim}}}(G)$$
of an “independent” family of maximal subgroups of *G* and maximum size *m*(*G*) of an irredundant sequence of generators of *G*. We prove that
$${{\mathrm{MaxDim}}}(G)=m(G)$$
if the derived subgroup of *G* is nilpotent. However,
$${{\mathrm{MaxDim}}}(G)-m(G)$$
can be arbitrarily large: for any odd prime *p*, we construct a finite soluble group with Fitting length two satisfying
$$m(G)=3$$
and
$${{\mathrm{MaxDim}}}(G)=p$$
.

## Remarks on the Gauss images of complete minimal surfaces in Euclidean four-space

### Annali di Matematica Pura ed Applicata (1923 -) (2017-02-24): 1-13 , February 24, 2017

We perform a systematic study of the image of the Gauss map for complete minimal surfaces in Euclidean four-space. In particular, we give a geometric interpretation of the maximal number of exceptional values of the Gauss map of a complete orientable minimal surface in Euclidean four-space. We also provide optimal results for the maximal number of exceptional values of the Gauss map of a complete minimal Lagrangian surface in the complex two-space and the generalized Gauss map of a complete nonorientable minimal surface in Euclidean four-space.

## Extensions of degree $$p^\ell $$ p ℓ of a p-adic field

### Annali di Matematica Pura ed Applicata (1923 -) (2017-04-01) 196: 457-477 , April 01, 2017

Given a *p*-adic field *K* and a prime number
$$\ell $$
, we count the total number of the isomorphism classes of
$$p^\ell $$
-extensions of *K* having no intermediate fields. Moreover, for each group that can appear as Galois group of the normal closure of such an extension, we count the number of isomorphism classes that contain extensions whose normal closure has Galois group isomorphic to the given group. Finally, we determine the ramification groups and the discriminant of the composite of all
$$p^\ell $$
-extensions of K with no intermediate fields. The principal tool is a result, proved at the beginning of the paper, which states that there is a one-to-one correspondence between the isomorphism classes of extensions of degree
$$p^\ell $$
of *K* having no intermediate extensions and the irreducible *H*-submodules of dimension
$$\ell $$
of
$$F^*{/}{F^*}^p$$
, where *F* is the composite of certain fixed normal extensions of *K* and *H* is its Galois group over *K*.

## Parabolic problems in highly oscillating thin domains

### Annali di Matematica Pura ed Applicata (1923 -) (2015-08-01) 194: 1203-1244 , August 01, 2015

In this work, we consider the asymptotic behavior of the nonlinear semigroup defined by a semilinear parabolic problem with homogeneous Neumann boundary conditions posed in a region of
$${\mathbb {R}}^2$$
that degenerates into a line segment when a positive parameter
$$\epsilon $$
goes to zero (a *thin domain*). Here we also allow that its boundary presents highly oscillatory behavior with different orders and variable profile. We take thin domains possessing the same order
$$\epsilon $$
to the thickness and amplitude of the oscillations, but assuming different order to the period of oscillations on the top and the bottom of the boundary. Combining methods from linear homogenization theory and the theory on nonlinear dynamics of dissipative systems, we obtain the limit problem establishing convergence properties for the nonlinear semigroup, as well as the upper semicontinuity of the attractors and stationary states.