El uso prolongado de la voz es un factor de riesgo para el desarrollo de patologías vocales en docentes. Actualmente, estos profesionales se ven obligados a usar mascarilla para dictar sus clases, lo que puede resultar en alteraciones vocales. Durante la virtualización de las clases los docentes debieron adaptar algún espacio doméstico para desempeñar sus funciones frente a un computador, disminuyendo la actividad física y fomentando un estilo de vida sedentario, lo que pudo ocasionar algún trastorno músculo-esquelético. Con este panorama, (...) el propósito del estudio es identificar efectos en la voz por la mascarilla y lesiones músculo-esqueléticas en docentes. (shrink)

La noción de interpretación desarrollada en el racionalismo crítico de Karl R. Popper muestra atributos específicos que la distinguen de modo sustancial de la interpretación constitutiva de la experiencia que tanto N. R. Hanson como Th. Kuhn defienden en sus respectivas propuestas. Se muestra que la interpretación del modelo popperia-no queda atrapada en una epistemología de corte empirista que la separa de modo radical de toda hermenéutica filosófica.

Dentre todas as possibilidades de ação feminista, há a militância em espaço público e a prática em apoio às mulheres, bem como a levada de consciência sobre pautas feministas para as mulheres, tanto no âmbito privado como no público. Esta era a abordagem de Andrea Dworkin, que proferia discursos em marchas e levava suas próprias experiências para o âmbito da escrita, sua prática profissional. A mesma abordagem era utilizada por Suzanne Lacy, artista contemporânea que, através de instalações urbanas, realizava suas (...) ações de militância combinada à arte. Este trabalho visa traçar parâmetros comuns entre estas duas mulheres, focando em suas pautas e na reverberação de seus trabalhos um em relação ao outro, bem como na sociedade.Palavras-chave: Público. Arte Contemporânea. Feminismo. AbstractAmongst all possibilities of feminist action there’s the militant strategy: to take the word of action into the public space, to act in women’s aid, to talk to your target audience and bring your discourse to the people. That was Andrea Dworkin’s strategy, who would bring her speeches into women’s marches and take her experience into her writing, which was her profession. The same strategy was taken by Suzanne Lacy, contemporary artist who focuses on urban installations to mix political and artistic action. This paper correlates these two authors, focusing on their preferred subjects and how their works reverberated together and in society.Keywords: Public. Contemporary Art. Feminism. (shrink)

El ensayo explora los principios básicos y los supuestos teóricos del socialismo raizal propuesto por el sociólogo colombiano Orlando Fals Borda. Este socialismo es presentado como una propuesta enraizada en la Investigación Acción Participativa, haciendo énfasis en su origen en las experiencias históricas revolucionarias de los pueblos originarios y diversos sectores populares de América Latina. Igualmente, se resalta su contenido popular, humanista, democrático y epistémico. El ensayo también explora sus acercamientos y sus diferencias con el pensamiento de Marx.

RESUMENAl analizar si Ludwig Wittgenstein mantiene una posición fundamentalista en Sobre la certeza, suele discutirse si la citada obra se adapta al modelo de fundamentalismo propuesto por Avrum Stroll. Tras exponer las líneas básicas de dicho modelo, en esta nota se mantiene que Sobre la certeza no se adapta al modelo de Stroll debido al importante papel que Wittgenstein concede al contextualismo. Además, se añade que Wittgenstein no puede ser calificado de fundamentalista porque no reconoce ninguna propiedad que, sin tener (...) en cuenta la diversidad de casos particulares, permita justificar de forma conjunta todas nuestras creencias básicas.PALABRAS CLAVEWITTGENSTEIN, FUNDAMENTALISMO, CONTEXTUALISMO, CERTEZAABSTRACTDid Wittgenstein hold a foundationalist position in On Certainty? When this question is tackled, it is often discussed, whether On Certainty fits in the foundationalist model devised by Avrum Stroll. After expounding the main lines of this model, I hold that On Certainty does not fit in Stroll’s model, because of the important role Wittgenstein attaches to contextualism. Furthermore, I add that Wittgenstein cannot be seen as a foundationalist –or a coherentist–, because he does not admit any feature in virtue of which the whole of our basic beliefs are justified without considering circumstances at all.KEYWORDSWITTGENSTEIN, CERTAINTY, FOUNDATIONALISM, CONTEXTUALISM. (shrink)

This paper investigates a connection between the semantic notion provided by the ordering * among theories in model theory and the syntactic SOPn hierarchy of Shelah. It introduces two properties which are natural extensions of this hierarchy, called SOP2 and SOP1. It is shown here that SOP3 implies SOP2 implies SOP1. In Shelah's article 229) it was shown that SOP3 implies *-maximality and we prove here that *-maximality in a model of GCH implies a property called SOP2″. It has been (...) subsequently shown by Shelah and Usvyatsov that SOP2″ and SOP2 are equivalent, so obtaining an implication between *-maximality and SOP2. It is not known if SOP2 and SOP3 are equivalent. Together with the known results about the connection between the SOPn hierarchy and the existence of universal models in the absence of GCH, the paper provides a step toward the classification of unstable theories without the strict order property. (shrink)

En el marco de la reflexión sobre las relaciones entre ética y política como dimensiones de la experiencia humana y de la vida en común, se presenta una aproximación comparativa a la noción de democracia del filósofo estadounidense John Dewey y la del neozapatismo mexicano. Se señalan algunos puntos de encuentro entre estas nociones, principalmente, la consideración de la democracia como forma de vida comunitaria, como ethos, no sólo como forma de gobierno, y la afirmación de la coexistencia entre lo (...) diverso, en distintas escalas, como condición de la democracia —el pluralismo en Dewey y el pluriversalismo en el neozapatismo—. Se indican también importantes diferencias como el énfasis en el desarrollo de las potencialidades humanas individuales presente sólo en Dewey, y la historicidad y las relaciones de poder que contempla la noción de democracia de los neozapatistas, a diferencia de la de Dewey. El texto afirma la posible fecundidad del diálogo entre distintas tradiciones de pensamiento para la comprensión de la democracia en un sentido más radical, en el que se imbriquen ética y política. (shrink)

We survey the use of club guessing and other PCF constructs in the context of showing that a given partially ordered class of objects does not have a largest, or a universal, element.

This article presents the stance taken by José Ortega y Gasset in the debate that took place in early-twentieth-century Spain regarding the convenience of reading Don Quixote in schools. To this end, we start by describing, albeit briefly, the state of Ortega y Gasset’s thought in 1920, when he writes Biología y pedagogía, the essay with which we shall concern ourselves. According to Ortega y Gasset, Don Quixote must not be read in the classroom because it does not contribute to (...) the development of the students’ spontaneous life, or natura naturans. In order to foster this development, Ortega y Gasset suggests leaving Don Quixote aside and resort to myths such as Odysseus or Heracles because their exploits would excite the students’ vital pulse. However, we suggest several reasons why the aim stated by Ortega y Gasset —and several other highly valuable educational benefits— could be reached resorting to the reading of selected passages of Don Quixote instead of the feats of Odysseus and Heracles. (shrink)

The poem collections Calamina and Amarillo crepúsculo show spaces and landscapes that acquire materiality in poetic language. Despite their clear differences, both texts configure space from a materiality crossed by modernity and its residues. The relation between landscape and poetry is studied using the concept of geo-poetics coined by Michel Collot in Pour une geographie litterair. The article purposes that the poetic subjects of these poems pose their looks on the landscapes’ memory understood as a ruin, instead of exercising the (...) romantic contemplation of the sublime. (shrink)

En el presente artículo abordo la preocupación de la filosofía y la medicina respecto a la vinculación entre dietética y ética. Para lograr aquello, el texto está dividido en cuatro partes. Las tres primeras se enfocan en exponer el pensamiento de Hipócrates, Friedrich Nietzsche y, Michel Foucault y sus reflexiones sobre la salud, la naturaleza humana, el autocontrol de la alimentación y la afirmación de la autonomía. La última sección está dedicada, por un lado, a señalar puntos comunes entre las (...) diversas reflexiones y, por otro, a reivindicar la dietética como problema filosófico y aspecto fundamental de la salud. (shrink)

If κ is any strongly unfoldable cardinal, then this is preserved in a forcing extension in which κ fails. This result continues the progression of the corresponding results for weakly compact cardinals, due to Woodin, and for indescribable cardinals, due to Hauser.

The paper is concerned with the existence of a universal graph at the successor of a strong limit singular μ of cofinality ℵ0. Starting from the assumption of the existence of a supercompact cardinal, a model is built in which for some such μ there are $\mu^{++}$ graphs on μ+ that taken jointly are universal for the graphs on μ+, while $2^{\mu^+} \gg \mu^{++}$ . The paper also addresses the general problem of obtaining a framework for consistency results at the (...) successor of a singular strong limit starting from the assumption that a supercompact cardinal κ exists. The result on the existence of universal graphs is obtained as a specific application of a more general method. (shrink)

Suppose that λ is the successor of a singular cardinal μ whose cofinality is an uncountable cardinal κ. We give a sufficient condition that the club filter of λ concentrating on the points of cofinality κ is not λ+-saturated.1 The condition is phrased in terms of a notion that we call weak reflection. We discuss various properties of weak reflection. We introduce a weak version of the ♣-principle, which we call ♣*−, and show that if it holds on a stationary (...) subset S of λ, then no normal filter on S is λ+-saturated. Under the above assumptions, ♣*− is true for any stationary subset S of λ which does not contain points of cofinality κ. For stationary sets S which concentrate on points of cofinality κ, we show that ♣*− holds modulo an ideal obtained through the weak reflection. (shrink)

La humanidad evolucionó durante milenios para desarrollar unas características biológicas, culturales, cognitivas y simbólicas comunes, que han posibilitado la expansión de nuestra especie por toda la Tierra y el desarrollo cultural y tecnológico de nuestra era. En este artículo exploramos someramente las ideas del ser humano, proyecciones simbólicas de lo que hemos aspirado a ser, y nos concentramos en la idea moderna autopoiética o de autotransformación, que en nuestro tiempo está postulando la necesidad y posibilidad de una transmutación radical de (...) nuestra especie mediante las bio y neuro tecnologías, generando lo que se denomina «antropotecnologías». El transhumanismo o movimiento de automutación radical de la especie humana nos conducirá, probablemente, a un objetivo que alterará la historia de la humanidad y que, por tanto, debe ser revisado y evaluado desde una perspectiva filosófica y ética por sus profundas consecuencias. (shrink)

RESUMENLas nanotecnologías constituyen actualmente elsector másinnovador y desafiante en el desarrollo tecnocientífico-industrial. Dado que nuestrastecnociencias no son capaces de crearsistemas que sean tanto o más consistentes, más estables y autosustentables que los sistemas naturales, son necesarias e indispensables la supervisión y la regulación prudencial y precautoria de sus efectos y consecuencias, esperadas e inesperadas, mediante un debate público con amplia participación democrática. La nanoética es una forma de poner en acción una racionalidad colectiva prudencial que, en vistas del alcance omniabarcador (...) de las nanotecnologías, tiene que ser construida a partir de principios éticos de alcance global y debe tener un carácter prospectivo.PALABRAS CLAVENANOTECNOLOGÍA, REGULACIÓN, RIESGO TECNOLÓGICO, NANOÉTICAABSTRACTNowadays nanotechnologies constitute the most innovative and challenging sector in technoscientific-industrial development. Our technosciences aren’t capable of generating equally or more consistent stable and self-sufficient systems than natural systems. Therefore, supervision together with reasonable and precautionary regulation of their effects and consequences -being these expected or unexpected-, in the form of public debate with ample democratic participation proves to be necessary. Nanoethics is a way of starting a reasonable collective rationality movement which, in view of the all-containing span of nanotechnologies, must be constructed from ethic principles that have a global reach and must as well have a prospective character.KEYWORDSNANOTECHNOLOGY, REGULATION, TECHNOLOGICAL RISK, NANOETHICS. (shrink)

Suppose that λ=λ <λ ≥ℵ0, and we are considering a theory T. We give a criterion on T which is sufficient for the consistent existence of λ++ universal models of T of size λ+ for models of T of size ≤λ+, and is meaningful when 2λ +>λ++. In fact, we work more generally with abstract elementary classes. The criterion for the consistent existence of universals applies to various well known theories, such as triangle-free graphs and simple theories. Having in mind (...) possible applications in analysis, we further observe that for such λ, for any fixed μ>λ+ regular with μ=μλ+, it is consistent that 2λ=μ and there is no normed vector space over ℚ of size <μ which is universal for normed vector spaces over ℚ of dimension λ+ under the notion of embedding h which specifies (a,b) such that ||h(x)/||x∈(a,b) for all x. (shrink)

We consider various versions of the ♣ principle. This principle is a known consequence of $\lozenge$ . It is well known that $\lozenge$ is not sensitive to minor changes in its definition, e.g., changing the guessing requirement form "guessing exactly" to "guessing modulo a finite set". We show however, that this is not true for ♣. We consider some other variants of ♣ as well.

Using a sample of 124 managers and 248 subordinates, this study examines the mediating effect of subordinates’ job satisfaction in the relationship between ethical leadership and subordinate organizational citizenship and counter-productive work behaviour in the Colombian context. We additionally analyse the effect of ethical leadership on subordinates’ perception of leaders’ performance. Factor analyses of the ethical leadership scale revealed two factors, ethical person and ethical guidance, which were differentially associated to the outcomes. We offer an explanation from three cultural dimensions (...) by which Colombian employees seem to be more willing to follow leaders’ ethical example as a way to strengthen their membership to the leader's group, than leaders ethical disciplining by which norms are imposed. These findings have a number of implications for organizations and managers who aim to improve their employees’ behaviour. Our advice to them is that leaders’ deeds have a greater impact than their ethical words. (shrink)

We prove consistent, assuming there is a supercompact cardinal, that there is a singular strong limit cardinal $\mu$ , of cofinality $\omega$ , such that every $\mu^{+}$ -chromatic graph X on $\mu^{+}$ has an edge colouring c of X into $\mu$ colours for which every vertex colouring g of X into at most $\mu$ many colours has a g-colour class on which c takes every value. The paper also contains some generalisations of the above statement in which $\mu^{+}$ is replaced (...) by other cardinals < $\mu$. (shrink)

This book, published in 2019 as an open-access edition of the Fordham University Press, attracts by its title. Imagination, as we mathematicians know only too w.

We introduce the oak property of first order theories, which is a syntactical condition that we show to be sufficient for a theory not to have universal models in cardinality λ when certain cardinal arithmetic assumptions about λ implying the failure of GCH hold. We give two examples of theories that have the oak property and show that none of these examples satisfy SOP4, not even SOP3. This is related to the question of the connection of the property SOP4 to (...) non-universality, as was raised by the earlier work of Shelah. One of our examples is the theory for which non-universality results similar to the ones we obtain are already known; hence we may view our results as an abstraction of the known results from a concrete theory to a class of theories. We show that no theory with the oak property is simple. (shrink)

Let κ be a singular cardinal. Karp's notion of a chain model of size κ is defined to be an ordinary model of size κ along with a decomposition of it into an increasing union of length cf. With a notion of satisfaction and -isomorphism such models give an infinitary logic largely mimicking first order logic. In this paper we associate to this logic a notion of a dynamic EF-game which gauges when two chain models are chain-isomorphic. To this game (...) is associated a tree which is a tree of size κ with no κ-branches -branches). The measure of how non-isomorphic the models are is reflected by a certain order on these trees, called reduction. We study the collection of trees of size κ with no κ-branches under this notion and prove that when cf = ω this collection is rather regular; in particular it has universality number exactly κ+. Such trees are then used to develop a descriptive set theory of the space cf κ. The main result of the paper gives in the case of κ strong limit singular an exact connection between the descriptive set-theoretic complexity of the chain isomorphism orbit of a model, the reduction order on the trees and winning strategies in the corresponding dynamic EF games. In particular we obtain a neat analog of the notion of Scott watershed from the Scott analysis of countable models. (shrink)

A wide Aronszajn tree is a tree of size and height $\omega _{1}$ with no uncountable branches. We prove that under $MA$ there is no wide Aronszajn tree which is universal under weak embeddings. This solves an open question of Mekler and Väänänen from 1994. We also prove that under $MA$, every wide Aronszajn tree weakly embeds in an Aronszajn tree, which combined with a result of Todorčević from 2007, gives that under $MA$ every wide Aronszajn tree embeds into a (...) Lipschitz tree or a coherent tree. We also prove that under $MA$ there is no wide Aronszajn tree which weakly embeds all Aronszajn trees, improving the result in the first paragraph as well as a result of Todorčević from 2007 who proved that under $MA$ there are no universal Aronszajn trees. (shrink)

We investigate strictly positive finitely additive measures on Boolean algebras and strictly positive Radon measures on compact zerodimensional spaces. The motivation is to find a combinatorial characterisation of Boolean algebras which carry a strictly positive finitely additive finite measure with some additional properties, such as separability or nonatomicity. A possible consistent characterisation for an algebra to carry a separable separable positive measure was suggested by Talagrand in 1980, which is that the Stone space K of the algebra satisfies that its (...) space M(K) of measures is weakly separable, equivalently that C(K) embeds into l∞. We show that there is a ZFC example of a Boolean algebra (so of a compact space) which satisfies this condition and does not support a separable strictly positive measure. However, we use this property as a tool in a proof which shows that under MA+⇁ CH every atomless ccc Boolean algebra of size < c carries a nonatomic strictly positive measure. Examples are given to show that this result does not hold in ZFC. Finally, we obtain a characterisation of Boolean algebras that carry a strictly positive nonatomic measure in terms of a chain condition, and we draw the conclusion that under MA+⇁ CH every atomless ccc Boolean algebra satisfies this stronger chain condition. (shrink)

Ante una ciencia mal-tratada desde su interior, un ojo enajenado y confundido en su visión, un ser humano cansado y desconfiado de la misma explicación, un mundo necesitado de comprensión y cuidado, ante unos cuantos insistentes de vivir en unos tiempos y espacios fragmentados, aparece la necesidad de escuchar de nuevo a lo propio, a lo primero y fundante como fuerza de transformación. Así, las siguientes letras reconocen un camino fenomenológico y contemplativo en la Gran Madre, la Hytcha Guaia, la (...) Pachamama, el primer gran útero, matriz sagrada que alimenta y nutre lo humano en toda su manifestación.Para la psicología, saber de psyque, de alma, su tarea también está en mirarse, recuperarse y a través de un logos trascendente, integrativo, volver a la sensible y sentida escucha de lo divino como curación, por ello su afirmación a lo mágico, chamánico, potente y sagrado del conocimiento telúrico (de tierra), a la medicina que en ella habita y su sanación. La propuesta es el gran camino de andar la tierra, de sentir, escuchar y estar en conciencia de raíz, un camino de cuidado que constata en cada ritual y experiencia la fuerza espiritual de nuestro saber ancestral indígena como primera y perenne ciencia. (shrink)

We give a construction of the square principle by means of forcing with finite conditions.

The status of independent statements is the main problem in the philosophy of set theory. We address this problem by presenting the perspective of a practising set theorist. We thus give an authentic insight in the current state of thinking in set-theoretic practice, which is to a large extent determined by independence results. During several meetings, the second author asked the first author about the development of forcing, the use of new axioms and set-theoretic intuition on independence. Parts of these (...) conversations are directly presented in this article. They are supplemented by important mathematical results as well as discussion sections. Finally, we present three hypotheses about set-theoretic practice: First, that most set theorists were surprised by the introduction of the forcing method. Second, that most set theorists think that forcing is a natural part of contemporary set theory. Third, that most set theorists prefer an answer to a problem with the help of a new axiom of lowest possible consistency strength, and that for most set theorists, a difference in consistency strength weighs much more than the difference between Forcing Axiom and Large Cardinal Axiom. (shrink)

We show the relative consistency of ℵ1 satisfying a combinatorial property considered by David Fremlin (in the question DU from his list) in certain choiceless inner models. This is demonstrated by first proving the property is true for Ramsey cardinals. In contrast, we show that in ZFC, no cardinal of uncountable cofinality can satisfy a similar, stronger property. The questions considered by D. H. Fremlin are if families of finite subsets of ω1 satisfying a certain density condition necessarily contain all (...) finite subsets of an infinite subset of ω1, and specifically if this and a stronger property hold under MA + ¬CH. Towards this we show that if MA + ¬CH holds, then for every family ? of ℵ1 many infinite subsets of ω1, one can find a family ? of finite subsets of ω1 which is dense in Fremlins sense, and does not contain all finite subsets of any set in ?.We then pose some open problems related to the question. (shrink)