# Ricerche di Matematica

Ricerche di Matematica > 2006 > 55 > 1 > 93-104

*Keywords:*Curves, Linear series

*Mathematics Subject Classification (2000):*...

Ricerche di Matematica > 2006 > 55 > 1 > 1-12

*Keywords:*Duality, Legendre transform, Nonlinear elasticity

*Mathematics Subject Classification (2000):*05C38, 15A15, 05A15, 15A18

Ricerche di Matematica > 2006 > 55 > 1 > 31-54

Ricerche di Matematica > 2006 > 55 > 1 > 119-144

*k*intrinsic forms for

*k*≠

*n*, but is of order 4 on

*n*intrinsic forms. As an application, we prove sharp...

Ricerche di Matematica > 2006 > 55 > 1 > 79-92

*Keywords:*Balance laws, Characteristics, Hunter-Saxton equation

*Mathematics Subject Classification (2000):*35L65, 35Q58

Ricerche di Matematica > 2006 > 55 > 1 > 55-69

*Keywords:*Anisotropic critical exponent, Critical level, Compactness, Nehari manifold

*Mathematics Subject Classification (2000):*35J25, 35J60, 35J65

Ricerche di Matematica > 2006 > 55 > 1 > 71-78

*d*with

*n*points of multiplicity

*m*always has the expected dimension when

*n*is a perfect square. We also prove some results on the dimension of the linear system when

*n*is close to a perfect square.

*Keywords:*Interpolation, Nagata, Linear systems, Plane curves

*Mathematics Subject Classification (2000):*14J26, 14N05

Ricerche di Matematica > 2006 > 55 > 1 > 145-170

*v*-domains. We investigate their close relation with the Prüfer ⋆-multiplication domains. In particular, we obtain a characterization of Prüfer ⋆-multiplication domains in terms of ⋆–domains satisfying...

Ricerche di Matematica > 2006 > 55 > 1 > 13-30

*Keywords:*Finite group, Subnormal subgroups, Formations

*Mathematics Subject Classification (2000):*20D10, 20D20, 20F17

Ricerche di Matematica > 2006 > 55 > 1 > 105-118

*balance of microforces*plays a central role in both deductive paths, but differs from it, mainly...

Ricerche di Matematica > 2006 > 55 > 2 > 123-137

*unitarian standpoint*in the spirit of the ideas of Born and Infeld. This model, introduced in [1], is based on a semilinear perturbation of the Maxwell equation (SME). The particles are described by the finite energy solitary waves of SME whose existence is due to the presence of the nonlinearity...

Ricerche di Matematica > 2006 > 55 > 2 > 11-58

*a*<

*x*<

*b*, 0 <

*t*<

*T*, the system of partial differential equations $$ \begin{array}{l} \displaystyle{\rho(x) {\partial v \over \partial t} - {\partial \over \partial x} \left(\mu(x,\theta) {\partial v \over \partial x}\right) = f,}\\ \\ \displaystyle{c(x,\theta) {\partial\theta \over \partial t} = \mu(x,\theta) \left({\partial v \over \partial...

Ricerche di Matematica > 2006 > 55 > 2 > 73-105

*L*

^{ p }-dissipativity of the Dirichlet problem for some systems of partial differential operators of the form $\partial_{h}({\mathop{\cal A}\nolimits}^{hk}(x)\partial_{k})$ , where ${\mathop{\cal A}\nolimits}^{hk}(x)$ are

*m*×

*m*matrices. First, we determine the sharp angle of dissipativity for a general scalar operator with complex coefficients...

Ricerche di Matematica > 2006 > 55 > 2 > 139-150

*Keywords:*Virtual Powers, Contact Interactions, Balance Equations

*Mathematics Subject Classification (2000):*74A10, 74G70, 74A30, 74A60

Ricerche di Matematica > 2006 > 55 > 2 > 151-157

*Keywords:*normalizer subgroup, metahamiltonian...

Ricerche di Matematica > 2006 > 55 > 2 > 107-122

*Keywords:*Parabolic operators, Liouville Theorems, Liouville Theorems in halfspaces

*Mathematics Subject Classification (2000):*35K65, 35H10, 35B99

Ricerche di Matematica > 2006 > 55 > 2 > 159-179

**u**

^{′}, such that the original system becomes symmetric hyperbolic and is

*generated*by four potentials. It is not easy to solve the restrictions...

Ricerche di Matematica > 2006 > 55 > 2 > 59-65

*G*having a T - group as factor

*G*/

*Z*

_{*}(

*G*) and exhibit connections with its Frattini subgroup and its nilpotemt radical.Mutually permutable products of these groups with supersolvable ones are described with consequences concerning the Fitting core of supesolvable groups.

*Keywords:*Hypercenter, T-group, Fitting core

*Mathematics Subject Classification (2000):*20D25, 20D40, 20D10

Ricerche di Matematica > 2006 > 55 > 2 > 67-72

*r*-canonical embeddings of general

*k*-gonal curves of genus

*g*from the point of view of Caporaso–Sernesi’s reconstruction procedure via odd theta-characteristics.

*Keywords:*Theta-characteristic, general

*k*-gonal curve, trigonal curve, pluricanonical embedding, Hilbert scheme

*Mathematics Subject Classification (2000):*14H50, 14N05

Ricerche di Matematica > 2007 > 56 > 1 > 1-17