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Now we are ready to state our method to obtain lower estimates of c x. Por su interminable paciencia y estar siempre presentes para aconsejarme y asistirme. It should be used poljnomiales by the corresponding citation acknowledging the source. We study what is sometimes called the factor problem and its applications to a geometrical problem called the plank problem. S l d C Now we are ready to prove our main result of this section. In Chapter 4 we exploit the inequalities presented in [BST, P], as well as the results regarding the factor problem obtained in Chapter 3, to address these kind of polynomial plank problems.

Proposition Let X be a d-dimensional real space and P: En nuestro caso la familia de funciones van a ser los polinomios de grado k en un espacio de Banach finito dimensional y V va a ser la bola unidad del espacio. As pointed out before, a corollary from this result is that c n X n n for any complex Banach space.

Consideramos el producto de funciones lineales i. Polinomiaes will treat separately the lower and the upper bound. For the lower bound, we will use again Jensen s inequality, and Desigauldades Note that for a finite dimensional space K d,this definition agrees with the standard definition of a polynomial on several variables, where a mapping P: Arens [Ar] generalized this to k linear operators and R. The space of k linear continuous operators from X Similarly, we can define z: Luis Federico Leloir, disponible en digital.


Jorge Tomás Rodríguez – Google Scholar Citations

Estudiamos este problema en diferentes contextos. In order to do this we will work with measures satisfying a not too restrictive property. El factor problem consiste en buscar cotas inferiores para la norma del producto de polinomios de grados previamente fijados. X R is an homogeneous polynomial.

We also give some estimates on the norm of the product of linear functions on l d Cdesigualdadess obtaining bounds for the nth polarization constant c n l d C.

It follows, by a complexification argument, that for a real Hilbert space the nth polarization constant is at most n n see [RS]. Insomecase, likeinthel p spacesandtheschattenclassess p, we obtain optimal lower bounds, while for other spaces we only give some estimates of the optimal lower bounds.

First we are going to estimate the Lebesgue measure E of the set E by integrating the characteristic function 1 E x of the set E over B d. With the same argument we may assume that there is desgualdades 0 S X such that x n x 0.

But this argument is no longer valid for the spaces l d p with p. The Mahler measure of a polynomial P: The authors found the exact value of c r d and proved that its order is d.

We aim to give sufficient conditions such that if a 1, Other quantities related to polynomials can be compared with the Mahler measure, such as the norm of a polynomial and its length defined below. The real case is similar and its proof can be found in Lemma.


The relative width of a plank is the width of the plank divided by the desiguapdades of the convex body in the direction that the plank attains its width.


We call such measures admissible. A prime example of this is the article [DM], where the authors give several relations between a variety of norms and the Mahler measure. We study this problem in different contexts. We are interested in inequalities similar to 1.

We apply our lower bounds for products of polynomials to study the plank problem, and obtain sufficient conditions for complex Banach spaces. In order to prove Theorem. More details on the Mahler measure can be found in the work of of M.

Rodríguez, Jorge Tomás

However, it is reasonable to try to improve this constraint when we restrict ourselves to polinomisles special Banach spaces. We focus mainly on the so called factor problem and plank problem.

This result was later extended to complex Hilbert spaces by A. Given a Banach space X, we denote its topological dual by X, the norm on the space by X or, when it is clear from context. This, and the fact that the Mahler measure is multiplicative, makes it possible to deduce inequalities regarding the norm or the length of the product of polynomials using the Mahler measure as a tool. You will then see the widget on your iGoogle ;olinomiales.

This inequality, combined with some properties of the Chebyshev polynomials, produces the following corollary, which most applications of Remez inequality use. We also study desiguqldades problem on different spaces: