By means of energy and entropy estimates, we prove existence and positivity results in higher space dimensions for degenerate parabolic equations of fourth order with nonnegative initial values. We discuss their asymptotic behaviour for t ! 1 and give a counterexample to uniqueness. 0. Introduction In this paper we will present new results on existence, (non)uniqueness, positivity and asymptoti...

In Revoke Ideology, Alipio De Sousa aims to explain the critical constructionist theory a broad audience. To achieve this objective, he reviews many of key concepts human sciences facilitating comprehension and accessibility that shape his ultimate proposal. Basically, sources are, among others, Emile Durkheim, Levi-Strauss, Louis Althusser, Pierre Bourdieu, Michel Maffesoli, Cornelius Castoria...

The Pic du Midi Observatory, situated at an altitude of 2890 meters, was always very hard to reach, and living there was difficult. Its history is a lesson in courage. It is also a lesson in creativity, because astronomers took advantage of the remarkable quality of the site in many ways, to study planets and, later, to prepare for the Apollo missions. They also invited geophysicists, botanists...