The imprints left by quantum mechanics in classical (Hamiltonian) mechanics are much more numerous than is usually believed. We show that the Schrödinger equation for a nonrelativistic spinless particle is a classical equation which is equivalent to Hamilton’s equations. Our discussion is quite general, and incorporates time-dependent systems. This gives us the opportunity of discussing the group of Hamiltonian canonical transformations which is a non-linear variant of the usual symplectic group.

Is the assessment of motor milestones valid and scaled equivalently for all infants? It is not only important to understand if the way we use gross and fine motor scores are appropriate for monitoring motor milestones but also to determine if these scores are confounded by specific infant characteristics. Therefore, the aim of the study is to investigate the latent structure underlying motor milestone assessment in infancy and measurement invariance across sex, birth weight, and gestational age. For this study, the (...) birth cohort data from the United Kingdom Millennium Cohort Study was used, which includes the assessment of eight motor milestone tasks from the Denver Developmental Screening Test in 9-month-old infants, depicting early motor development of the first children of generation Z. Confirmatory factor analyses showed a better model fit for a two-factor structure compared to a one-factor structure, and multiple indicators multiple causes modeling revealed no differential item functioning related to sex, birth weight, and gestational age. The study provides support for the use of gross and fine motor scores when assessing motor milestones in infants—both boys and girls with different birth weights and of varying gestational ages. Further investigation into widely adopted assessment tools is recommended to support the use of valid composite scores in early childhood research and practice. (shrink)

Although shared decision-making is a standard in medical care, unilateral decisions through process-based conflict resolution policies have been defended in certain cases. In patients who do not stand to receive proportional clinical benefits, the harms involved in interventions such as cardiopulmonary resuscitation seem to run contrary to the principle of non-maleficence, and provision of such interventions may cause clinicians significant moral distress. However, because the application of these policies involves taking choices out of the domain of shared decision-making, they face (...) important ethical and legal problems, including a recent challenge to their constitutionality. In light of these concerns, we suggest a re-conceptualization of informed non-dissent as an alternative approach in cases where the application of process-based policies is being considered. This clinician-directed communication model still preserves what is valuable in such policies and salvages professional integrity, while minimising ethical and legal challenges. (shrink)

The necessary appearance of Clifford algebras in the quantum description of fermions has prompted us to re-examine the fundamental role played by the quaternion Clifford algebra, C 0,2 . This algebra is essentially the geometric algebra describing the rotational properties of space. Hidden within this algebra are symplectic structures with Heisenberg algebras at their core. This algebra also enables us to define a Poisson algebra of all homogeneous quadratic polynomials on a two-dimensional sub-space, $\mathbb{F}^{a}$ of the Euclidean three-space. This enables (...) us to construct a Poisson Clifford algebra, ℍ F , of a finite dimensional phase space which will carry the dynamics. The quantum dynamics appears as a realisation of ℍ F in terms of a Clifford algebra consisting of Hermitian operators. (shrink)

Carl Henrik Koch har i denne bog samlet en række af sine artikler om fremtrædende danske filosoffer. Med start ved Holberg i 1700-tallet arbejder Koch sig op gennem den danske filosofihistorie og strejfer blandt andre Eilchov, Sibbern, A.P. Adler, Brøchner og naturligvis mastodonterne Søren Kierkegaard og Georg Brandes. Bogen giver en hurtig, men spændende indførsel i en vigtig del af den danske kulturhistorie, som gennem de sidste 250 år har haft stor indflydelse både herhjemme og i udlandet.

Résumé Les affinités paradoxales que la recherche a pu pointer entre la « secte » philosophique épicurienne et la secte chrétienne dans les premiers siècles de notre ère sont rappelées puis examinées dans le détail du premier document attestant une rencontre précise entre les deux sectes, le récit des Actes des Apôtres qui montre Paul discutant avec les Épicuriens et les Stoïciens d’Athènes, puis nous restitue le discours de Paul devant l’Aréopage d’Athènes. Il apparaît que Paul se pose en philosophe (...) pour exposer sa doctrine en des termes jusqu’à un certain point compatibles avec une doctrine matérialiste voire polythéiste. (shrink)

Cet ouvrage est le fruit d'une recherche approfondie dans le champ de l'esthétique et de l'herméneutique des traditions orales africaines. Il est remarquable par sa singularité et son niveau d'élaboration philosophique. Il aura fallu traverser le triple brouillage des codes culturels eux-mêmes, de l'acculturation notamment coloniale, et du particularisme des études ethnologiques et philosophiques alors disponibles. Il aura fallu, en outre, mettre en oeuvre une démarche d'analyse régressive permettant de décliner les catégories qui, en deçà des normes et des procédés (...) constituant le système des réponses, les font tenir ensemble. L'oeuvre n'est pas une invite à un repli passéiste de la culture négro-africaine sur elle-même. Il faut y voir plutôt une tentative de détermination d'un "fonds de sens" susceptible de réappropriations différentes. (shrink)

Robert Nozick famously asks us whether we would plug in to an experience machine, or whether we would insist upon ‘living in contact with reality’. Felipe De Brigard, after conducting a series of empirical ‘inverted’ experience machine studies, suggests that this is a false dilemma. Rather, he says, ’…the fact is that people tend to prefer the state of affairs they are in currently,’ or the status quo. In this paper, I argue that these studies are a test case for (...) ‘experimental philosophy’ as such. Specifically, I argue that De Brigard offers a series of faulty studies, and so, reaches unfounded conclusions. More generally, I argue that certain philosophical thought experiments cannot be tested empirically at all, and this limits what experimental philosophy can do. (shrink)

The hard problem of consciousness is the problem of explaining how and why physical processes give rise to consciousness (Chalmers 1995). Regardless of many attempts to solve the problem, there is still no commonly agreed solution. It is thus very likely that some radically new ideas are required if we are to make any progress. In this paper we turn to quantum theory to find out whether it has anything to offer in our attempts to understand the place of mind (...) and conscious experience in nature. In particular we will be focusing on the ontological interpretation of quantum theory proposed by Bohm and Hiley (1987, 1993), its further development by Hiley (Hiley and Callaghan 2012; Hiley, Dennis and de Gosson 2021), and its philosophical interpretation by Pylkkänen (2007, 2020). The ontological interpretation makes the radical proposal that quantum reality includes a new type of potential energy which contains active information. This proposal, if correct, constitutes a major change in our notion of matter. We are used to having in physics only mechanical concepts, such as position, momentum and force. Our intuition that it is not possible to understand how and why physical processes can give rise to consciousness is partly the result of our assuming that physical processes (including neurophysiological processes) are always mechanical. If, however, we are willing to change our view of physical reality by allowing non-mechanical, organic and holistic concepts such as active information to play a fundamental role, this, we argue, makes it possible to understand the relationship between physical and mental processes in a new way. It might even be a step toward solving the hard problem. (shrink)

In this paper, I show where Adolf Reinach comes down on the question of conflicts of obligation. The aim is to look at whether Reinach’s phenomenological realism of obligation holds its own against positions developed by Bernard Williams concerning the nature and import of obligations, and their capacity or incapacity to impinge upon each other and other moral and non-moral concerns. It is shown that even if Reinach turns out to succumb to pitfalls Williams identifies, he nonetheless verges upon agreement (...) with Williams in more ways than one might expect. This result is significant because it shows that Reinach’s phenomenological realism, in contrast to certain forms of moral realism, lays the foundations for what can be considered a heterontology of obligation and ethical concerns, which is presupposed by the experience of (moral) conflict in the first place. (shrink)

English summary: French description: Pensees du corps: se peut-il que le corps pense, qu'il ne soit pas un simple objet de reflexion, mais un sujet de pensee a part entiere?La demarche philosophique est ici confrontee a un corpus de pratiques et d'arts gestuels japonais (danse, theatre, arts martiaux). Une serie d'experiences significatives bousculent les idees recues et poussent le penseur a un renouvellement radical de ses methodes et de ses concepts. En resulte une philosophie de terrain, incarnee et immanente, qui (...) met en lumiere la profonde rationalite du corps. Y compris dans ses deploiements qui d'ordinaire resistent a l'analyse: sensation et action.Nul besoin d'avoir recours a un relativisme culturaliste friand d'exotisme, encore moins a un quelconque irrationalisme. Les pensees du corps dessinent un espace de publicite et d'intelligibilite, une forme d'universalite que chacun peut intimement eprouver et affiner. Loin de constituer un dehors, le corps apparait comme le lieu de production d'un savoir et d'une pensee universellement partageables. (shrink)