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- Jaime Nava, Vladik Kreinovich
- 2013

In many practical applications, it is useful to represent a signal or an image by its average values on several fuzzy sets. The corresponding F-transform technique has many useful applications in signal and image processing. In principle, we can use different membership functions. Somewhat surprisingly, in many applications, the best results occur when we… (More)

- Jesus E Hernandez, Jaime Nava
- 2010

—In natural language, " or " sometimes means " inclusive or " and sometimes means " exclusive or ". To adequately describe commonsense and expert knowledge, it is therefore important to have not only t-conorms describing fuzzy " inclusive or " operations, but also fuzzy " exclusive or " operations f⊕(a, b). Since the degrees of certainty are only… (More)

- J Nava, V Kreinovich
- 2011

In many applications of interval computations, it turned out to be beneficial to represent polynomials on a given interval [x, x] as linear combinations of Bernstein polynomials (x − x) k · (x − x) n−k. In this paper, we provide a theoretical explanation for this empirical success: namely, we show that under reasonable optimality criteria, Bernstein… (More)

One of the main problems with neural networks is that they are often very slow in learning the desired dependence. To speed up neural networks, Bruno Apolloni proposed to othogonalize neurons during training, i.e., to select neurons whose output functions are orthogonal to each other. In this paper, we use symmetries to provide a theoretical explanation for… (More)

—It is well known that an arbitrary continuous function on a bounded set – e.g., on an interval [a, b] – can be, with any given accuracy, approximated by a polynomial or by a piece-wise polynomial function (spline). Usually, polynomials are described as linear combinations of monomials. It turns out that in many computational problems, it is more efficient… (More)

- Samuel Bravo, Jaime Nava
- 2010

—In fuzzy control, two approaches are mainly used: Mamdani's approach, in which we represent the knowledge base as a disjunction of statements Ai(x) & Bi(u) corresponding to individual rules, and logical approach, in which the knowledge based is represented as a conjunction of the rules themselves Ai(x) → Bi(u). Both approaches are known not to be perfect,… (More)

- Jaime Nava, Vladik Kreinovich, Guillermo Restrepo, Douglas J Klein
- 2010

In many applications, we have numerous molecules that are obtained from a " template " molecule like benzene C6H6 or cubane C8H8 by replacing some of its hydrogen atoms with other atoms or atom groups (called ligands). Depending on how many original atoms are replaced and which ones are replaced, we obtain a large number of different chemical substances. It… (More)

- Jaime Nava, Juan Ferret, Vladik Kreinovich
- 2009

To describe physics properly, we need to take into account quantum effects. Thus, for every non-quantum physical theory, we must come up with an appropriate quantum theory. A traditional approach is to replace all the scalars in the classical description of this theory by the corresponding operators. The problem with the above approach is that due to… (More)

- Jaime Nava
- 2013

In describing expert knowledge, it is often important to properly take into account hedges like " very " , " somewhat " , etc. In particular, fuzzy logic provides a consistent way of describing hedges. For some of the hedges, a repetition changes the meaning: e.g., " very very small " is smaller than " very small ". However, other hedges – like " somewhat "… (More)

- Jaime Nava, Vladik Kreinovich
- 2013

Many real-life dependencies can be reasonably accurately described by linear functions. If we want a more accurate description, we need to take non-linear terms into account. To take nonlinear terms into account, we can either explicitly add quadratic terms to the regression equation, or, alternatively, we can train a neural network with a non-linear… (More)