Two populations are subdivided into two categories of individuals (hawks and doves). Individuals fight to have access to a resource which is necessary for their survival. Conflicts occur between individuals belonging to the same population and to different populations. We investigate the long term effects of the conflicts on the stability of the community. The modelis a set of ODE's with four variables corresponding to hawk and dove individuals of the two populations. Two time scales are considered. A fast time (...) scale is used to describe frequent encounters and fightings between individuals trying to monopolize the resource. A slow time scale is used for the demography and the long term effects of encounters. We use aggregation methods in order to reduce this model into a system of two ODE's only for the total densities of the two populations which is found to be a classical Lotka-Volterra competition model. We study different cases of proportions of hawks and doves in both populations on the global coexistence and the mutal exclusion of the two populations. Pure dove tactics in both populations are unstable. In cases of mixed hawk and dove in both populations, there is coexistence. Pure dove or mixed hawk-dove tactics in one population can coexist with pure hawks in the other one when the costs of fightings between hawks are large enough. (shrink)

As the result of the complexity inherent in nature, mathematical models employed in ecology are often governed by a large number of variables. For instance, in the study of population dynamics we often deal with models for structured populations in which individuals are classified regarding their age, size, activity or location, and this structuring of the population leads to high dimensional systems. In many instances, the dynamics of the system is controlled by processes whose time scales are very different from (...) each other. Aggregation techniques take advantage of this situation to build a low dimensional reduced system from which behavior we can approximate the dynamics of the complex original system.In this work we extend aggregation techniques to the case of time dependent discrete population models with two time scales where both the fast and the slow processes are allowed to change at their own characteristic time scale, generalizing the results of previous studies. We propose a non-autonomous model with two time scales, construct an aggregated model and give relationship between the variables governing the original and the reduced systems. We also explore how the properties of strong and weak ergodicity, regarding the capacity of the system to forget initial conditions, of the original system can be studied in terms of the reduced system. (shrink)

The 18th century was a wealth of knowledge, exploration and rapidly growing technology and expanding record-keeping made possible by advances in the printing press. In its determination to preserve the century of revolution, Gale initiated a revolution of its own: digitization of epic proportions to preserve these invaluable works in the largest archive of its kind. Now for the first time these high-quality digital copies of original 18th century manuscripts are available in print, making them highly accessible to libraries, undergraduate (...) students, and independent scholars. Delve into what it was like to live during the eighteenth century by reading the first-hand accounts of everyday people, including city dwellers and farmers, businessmen and bankers, artisans and merchants, artists and their patrons, politicians and their constituents. Original texts make the American, French, and Industrial revolutions vividly contemporary. ++++ The below data was compiled from various identification fields in the bibliographic record of this title. This data is provided as an additional tool in helping to insure edition identification: ++++ British Library T100404 With a half-title. Anonymous. By P. P. F. J. H. Le Mercier de la Rivière. Possibly printed in Paris (or the Low Countries). Londres: chez Jean Nourse; & se trouve à Paris, chez Desaint, 1767. [2], vii, [1],511, [1]p.; 4°. (shrink)

Resumen:Pierre Dardot ha estudiado detenidamente la historia constitucional chilena de las últimas décadas. En este libro, examina el proceso constituyente iniciado después de la manifestación de octubre de 2019. Es un tema que nos toca de cerca, así que me permitiré hacer algunos alcances que rebasan el marco de una reseña. De hecho, intento esbozar una réplica a la tesis del libro: la continuidad del régimen instaurado con la Constitución del 80. “Lo que está en juego aquí, es la (...) historicidad del trauma como ‘huella psíquica de un suceso trágico’. Sin duda, esta huella vuelve a rondar el presente en octubre 2019” (21). La “historicidad” se refiere a una herida que no logran borrar los años, a pesar de que ya no están en el mundo los protagonistas y muchos ni siquiera habían nacido cuando se produjo aquel fatídico Once. La “historicidad” alude, pues, a una historia sin tiempo, que habla de acontecimientos que la memoria no podrá olvidar jamás. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:diacritics 34.2 (2006) 3-13 [Access article in PDF] Biographical Illusion and Methodological Reality Leland De La Durantaye Pierre Bourdieu. Esquisse Pour Une Auto-Analyse. Paris: Raisons d'Agir, 2004. 1 Like his student and friend Nietzsche, Jacob Burckhardt often stressed the necessity for a scholar to work in solitude. Like Nietzsche, he also possessed a gift for acidic analogy and likened the world of academia to a group of dogs (...) sniffing one another.Few observers of the academic interactions of his time had such sharp senses as Pierre Bourdieu, and few have been as torn between solitary reflection and communal exchange. Trained by France's most elite academic institutions (such as the celebrated Parisian lycée Louis-le-Grand and the even more celebrated École Normale Supérieure), Bourdieu was grateful for the opportunities that this training afforded him. And he felt that this gratitude could best be repaid by submitting those elite academic institutions and their insular world to an unsparing critique, to unveiling the distance that separated their stated ideals from their real effects.Like Bergson and Jaurès, like Sartre and Aron, like Foucault and Derrida, Bourdieu studied that which was most difficult and most prestigious where it was most difficult and prestigious: philosophy at the École Normale Supérieure. Like those famous fellow alumni, he was a brilliant student, and like them, he longed to distinguish his personal vision from those around him. This led him to do something surprising, something that, despite their separate and significant dissatisfactions with the philosophy of their day, neither Bergson nor Sartre, neither Foucault nor Derrida ever did: he abandoned philosophy. He left what he saw as the intellectual royal road for the most pedestrian of paths—that of sociology.As he often reminded his readers, sociology was in a sorry state when he entered it. Both in academic appraisal and the popular imagination, it was considered dry and provincial. It was thought to have no true intellectual adventure in it—nothing of the ethnologist tramping through the rain forests of the Amazon, nothing of the lone philosopher working through the night on an opus to end metaphysics. It was laborious and abstract; it dealt in statistical generalities. Bourdieu repeatedly described sociology as "the pariah of disciplines."1 He had, however, a special mission for it in mind. [End Page 3]In Bourdieu's posthumous memoir Esquisse pour une auto-analyse, published in February 2004—two years after his death—by the small publishing house he helped found, Raisons d'Agir, he notes how, "a bit as a joke," he had often defined himself as "the leader of a liberation movement aiming to free the social sciences from philosophy's imperialism" [94].2 From early on in his career, he had wished to revolt against the "empire of the total philosopher"—an empire reigned over by, more than any other, Jean-Paul Sartre [cf. 25].3 Looking back upon this decisive period of his development, Bourdieu goes so far as to state that the shaping of his identity was done "against everything which the Sartrian enterprise represented for me" [37]. In historical accounts, Sartre is often given as counterfigure his friend and fellow normalien Raymond Aron. In his Esquisse, Bourdieu proposes a different, and less conventional, counterfigure for the imperial philosopher: the brilliant Austrian satirist and cultural critic Karl Kraus. Bourdieu notes the particular affection he had always felt for Kraus and attributes it to the latter's singular capacity for "critical reflectivenesss" [37]. Subtly, and appropriately, Bourdieu follows this remark with something that occurs nowhere else in his memoir: an epigram (the composing of which Kraus excelled in). Bourdieu writes: "there are a great many intellectuals who question the world, but there are very few intellectuals who question the intellectual world" [37]. The remark could not more compactly and precisely reflect what Bourdieu had aspired all his life to do: to excel in the art and science of questioning the intellectual world. 2 Leo Spitzer liked to cite Friedrich Gundolf's dictum "Methode ist Erlebnis" (method is lived experience). Nearing the end of his career... (shrink)

Pierre Dardot ha estudiado detenidamente la historia constitucional chilena de las últimas décadas. En este libro, examina el proceso constituyente iniciado después de la manifestación de octubre de 2019. Es un tema que nos toca de cerca, así que me permitiré hacer algunos alcances que rebasan el marco de una reseña. De hecho, intento esbozar una réplica a la tesis del libro: la continuidad del régimen instaurado con la Constitución del 80. “Lo que está en juego aquí, es la (...) historicidad del trauma como ‘huella psíquica de un suceso trágico’. Sin duda, esta huella vuelve a rondar el presente en octubre 2019” (21). La “historicidad” se refiere a una herida que no logran borrar los años, a pesar de que ya no están en el mundo los protagonistas y muchos ni siquiera habían nacido cuando se produjo aquel fatídico Once. La “historicidad” alude, pues, a una historia sin tiempo, que habla de acontecimientos que la memoria no podrá olvidar jamás. (shrink)

Essais que composait Teilhard de Chardin dans les tranchées alors qu'il était brancardier au cours de la Grande Guerre. [SDM].