We give a new characterization of the cardinal invariant $\mathfrak {d}$ as the minimal cardinality of a family $\mathcal {D}$ of tall summable ideals such that an ultrafilter is rapid if and only if it has non-empty intersection with all the ideals in the family $\mathcal {D}$. On the other hand, we prove that in the Miller model, given any family $\mathcal {D}$ of analytic tall p-ideals such that $\vert \mathcal {D}\vert <\mathfrak {d}$, there is an ultrafilter $\mathcal {U}$ which (...) is an $\mathscr {I}$ -ultrafilter for all ideals $\mathscr {I}\in \mathcal {D}$ at the same time, yet $\mathcal {U}$ is not a rapid ultrafilter. As a corollary, we obtain that in the Miller model, given any analytic tall p-ideal $\mathscr {I}$, $\mathscr {I}$ -ultrafilters are dense in the Rudin–Blass ordering, generalizing a theorem of Bartoszyński and S. Shelah, who proved that in such model, Hausdorff ultrafilters are dense in the Rudin–Blass ordering. This theorem also shows some limitations about possible generalizations of a theorem of C. Laflamme and J. Zhu. (shrink)

Cognitive dissonance has been studied for more than sixty years and many insightful findings have come from this research. However, some important theoretical and methodological issues are yet to be resolved, particularly regarding dissonance reduction. In this paper, we place dissonance theory in the larger framework of appraisal theories of emotion, emotion regulation, and coping. The basic premise of dissonance theory is that people experience negative affect (to varying degrees) following the detection of cognitive conflict. The individual will be motivated (...) to alleviate these emotional reactions and could do so by reducing dissonance in some manner. We argue that detection of dissonance will follow the same principles as when people interpret any other stimuli as emotionally significant. Thus, appraisal theory of emotion, which argues that emotions are generated via the cognitive evaluation of surrounding stimuli, should be applicable to the dissonance-detection process. In short, we argue that dissonance-reduction strategies (attitude change, trivialization, denial of responsibility, etc.) can be understood as emotion-regulation strategies. We further argue that this perspective contributes to reconciling fragmented (and sometimes contrary) viewpoints present in the literature on dissonance reduction. In addition to proposing the general model of dissonance reduction, we illustrate at the hand of empirical data how research on dissonance reduction can be performed without relying on experimental paradigms that focus on a specific reduction strategy. (shrink)

: All known life requires phosphorus (P) in the form of inorganic phosphate (PO43x or Pi) and phosphate-containing organic molecules. Pi serves as the backbone of the nucleic acids that constitute genetic material and as the major repository of chemical energy for metabolism in polyphosphate bonds. Arsenic (As) lies directly below P on the periodic table and so the two elements share many chemical properties, although their chemistries are sufficiently dissimilar that As cannot directly replace P in modern biochemistry. Arsenic (...) is toxic because As and P are similar enough that organisms attempt this substitution. We hypothesize that ancient biochemical systems, analogous to but distinct from those known today, could have utilized arsenate in the equivalent biological role as phosphate. Organisms utilizing such ‘ weird life ’ biochemical pathways may have supported a ‘ shadow biosphere ’ at the time of the origin and early evolution of life on Earth or on other planets. Such organisms may even persist on Earth today, undetected, in unusual niches. (shrink)

Este artículo examina de qué formas pueden defenderse conjuntamente los métodos de investigación con animales no humanos, el rechazo de los métodos que no impliquen el uso de animales, y la oposición a la experimentación con humanos. El artículo argumenta que la apelación a un salto axiológico o normativo entre el peso de los intereses humanos y de los animales no humanos tiene consecuencias inaceptables. A continuación, presenta otra serie de problemas implicados por las demás posiciones antropocéntricas. Finalmente, argumenta que, (...) aun si se acepta el antropocentrismo, el peso agregado de los intereses de los animales acaba superando al del interés humano en utilizarlos. (shrink)

En este artículo se explica en qué consisten las éticas centradas en el sufrimiento, presenta algunas de las principales razones a su favor y expone cuáles son sus implicaciones con respecto a la consideración moral de los animales. Se argumenta que conforme a estas éticas los usos como recursos de los animales lesivos para estos deberán ser rechazados. A continuación, se examinan las posiciones que aceptan el uso de los animales siempre que este tenga lugar reduciendo los daños infligidos a (...) estos. Se presentarán una serie de razones por las que tales posiciones resultan cuestionables y por las que van a entrar en conflicto con las implicaciones de las éticas centradas en el sufrimiento. (shrink)

El objetivo de este trabajo es presentar la noción de Imaginario Social de Cornelius Castoriadis y la pertinencia de su utilización para el estudio de los movimientos sociales. Para ello, se repasarán las principales perspectivas teóricas que han abordado este fenómeno social; algunas claves conceptuales en el pensamiento de Castoriadis y una propuesta para el abordaje empírico de los movimientos sociales con dicho andamiaje teórico.

El caso del Movimiento Arcoíris en Chile permite ilustrar en dos ámbitos, los significados atribuidos a la naturaleza y las formas que adquiere la acción colectiva contemporánea, las derivas y tensiones que se presentan al intentar materializar el mundo anhelado. Esta investigación, se efectuó por medio de una etnografía (2009-2022) y diez entrevistas semiestructuradas analizadas desde un enfoque hermenéutico. Tuvo como resultados nueve prácticas sedimentadas -de las cuales se presentan tres- y un conjunto heterogéneo de significaciones para cada una de (...) ellas. A modo de discusión y conclusión se propone que este Movimiento expande un tipo de vínculo afectivo/espiritual con la naturaleza que rehúye del modo de producción industrial y que sus formas de acción colectiva privilegian la autonomía y la horizontalidad entre sus miembros. Ambas cuestiones encuentran límites en la espontaneidad de las acciones, el capitalismo verde, en las dificultades para arribar a acuerdos y/o su escaso cumplimiento. (shrink)

We say that $\mathcal {I}$ is an ideal independent family if no element of ${\mathcal {I}}$ is a subset mod finite of a union of finitely many other elements of ${\mathcal {I}}.$ We will show that the minimum size of a maximal ideal independent family is consistently bigger than both $\mathfrak {d}$ and $\mathfrak {u},$ this answers a question of Donald Monk.

Sermón en lengua de Chile, del jesuita granadino Luis de Valdivia, incluye, en su versión en español, varios términos en mapudungun, de estos ‘huecuvoe’, ‘marepuante’ y ‘pillan’ se explican como “equivalentes” a las divinidades del cristianismo. En este trabajo, apoyándonos en la etnohistoria, evaluamos su correspondencia con los referentes de la cultura mapuche y concluimos que se trata de conceptos que han sufrido un proceso de desplazamiento semántico motivado por la visión de mundo del locutor. De este modo, se genera (...) un discurso falible en su efectividad argumentativa. Sermón en lengua de Chile written by Spanish Jesuit Luis de Valdivia incorporates vocabulary from the Mapudungun language. Several terms in Mapudungun such as ‘huecovoe’, ‘marepuante’ and ‘pillan’, are explained as “equivalents” of Christian divinities. Based on ethnohistorical studies, in this paper we analyze the effective concept relationships and meaning in the Mapuche culture. The main findings suggest that these concepts have undergone a semantic change as a result of the writer’s worldviews. Thus, a fallible discourse is generated in its argument effectiveness. (shrink)

Evidence about whether reflective thinking may be induced and whether it affects utilitarian choices is inconclusive. Research suggests that answering items correctly in the Cognitive Reflection Test (CRT) before responding to dilemmas may lead to more utilitarian decisions. However, it is unclear to what extent this effect is driven by the inhibition of intuitive wrong responses (reflection) versus the requirement to engage in deliberative processing. To clarify this issue, participants completed either the CRT or the Berlin Numeracy Test (BNT) – (...) which does not require reflection – before responding to moral dilemmas. To distinguish between the potential effect of participants’ previous reflective traits and that of performing a task that can increase reflectivity, we manipulated whether participants received feedback for incorrect items. Findings revealed that both CRT and BNT scores predicted utilitarian decisions when feedback was not provided. Additionally, feedback enhanced performance for both tasks, although it only increased utilitarian decisions when it was linked to the BNT. Taken together, these results suggest that performance in a numeric task that requires deliberative thinking may predict utilitarian responses to moral dilemmas. The finding that feedback increased utilitarian decisions only in the case of BNT casts doubt upon the reflective-utilitarian link. (shrink)

Literature reports that depressive symptoms may precede suicidal ideation. Several studies have identified social support and substance use as moderators of this relationship. However, no study has evaluated these variables together by testing how substance use can affect the moderating effect of social support in this relationship. The purpose of this article is to individually evaluate dimensions of social support (friends, family, significant others, and school) and substance use (alcohol, marijuana, and other illicit drugs), as moderators of the relationship between (...) depressive symptoms and suicidal ideation; as well as analyze the moderating role of substance use in the moderation exerted by social support in this relationship. This study, quantitative and cross-sectional, considered 775 adolescents [Average age = 15.48 (SD = 0.96), 45.9% women], from 20 randomly selected schools in Santiago de Chile. Simple moderation models were used to analyze possible moderators separately, and double moderation models were used to analyze the moderating role of substance use in the moderating effect of social support. The results show that the four dimensions of social support moderate the relationship between depressive symptomatology and suicidal ideation, showing the strongest interaction in the case of family support, followed by support of a significant person, support at school, and support of friends, in that order. On the other hand, alcohol was the only drug that moderated the relationship in question. In addition, the results show that the use of alcohol limits the moderating effect of social support in the fields of family, significant person, and school support, but not in the case of support of friends. The use of marijuana and other illicit drugs did not affect the moderating effects of social support for any of the areas evaluated. The results are discussed according to the different roles that alcohol use can play in adolescence, and how these, together with perceived social support, are related to the emergence of suicidal ideation from depressive symptoms. (shrink)