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The Forum is open to everyone, including students, visitors, and faculty members from all departments and institutes!

The 60 minute lecture is followed by a 10 minute break and a 30-60 minute discussion. The language of presentation is English or Hungarian.


The scope of the Forum includes all aspects of theoretical philosophy, including:

  • logic and philosophy of formal sciences
  • philosophy of science
  • modern metaphysics
  • epistemology
  • philosophy of language
  • problems in history of philosophy and history of science, relevant to the above topics
  • particular issues in natural and social sciences, important for the discourses in the main scope of the Forum.



7 October (Wednesday) 5:00 PM  Room 226
György Darvas
  Symmetrion, Budapest
Isotopic field-charges in the physical world-view
Can identical (properties) be equivalent? First, I will illustrate the difference between equivalence and identity on the example of non-identity of the gravitational and inertial masses. I will extend this difference to the sources (field-charges) of other physical fields, e.g., to Coulomb- and Lorentz-charges, etc. Thus, the isotopic field-charges will be defined. We will investigate, whether field-charges (sources) are identical in the scalar and vector potentials of a field. I attempt to justify the difference by a short retrospection to the description of the quantum theory of the electron (1928-), referring to the two "classical" ways of the quantum electrodynamic model, and to less classical ones. I mistrust, how much relativistic was "classical" QED. As a consequence, we define an isotopic field-charge model. This idea leads to the necessity of conservation of a quantity, called "isotopic field-charge spin". (The contexture includes quantities, transformations into each other, violation of symmetries and their restoration by the way of another invariance, their group, and predicting a family of mediating bosons.) The final three questions: (a) how does the isotopic field-charge model extend the physical world-picture of the Standard Model that seemed to be closed for long; (b) up to what extent does it preserve and among what conditions does it extend the SM; as well (c) what is its relation to the supersymmetric model. Do the answers given to these questions fit in the frame of an alternative physical picture of the world, and how can they be proven?

14 October (Wednesday) 5:00 PM  Room 226
Judit X. Madarász
Alfréd Rényi Institute of Mathematics, Budapest
Principle of Relativity,  Isotropy and Homogeneity
In firs order logic framework, we formalize Special Principle of Relativity, isotropy and homogeneity of space-time in several ways and we investigate their interrelationships.

21 October (Wednesday) 5:00 PM  Room 226
Ákos Gyarmathy & Péter Neuman
Department of Philosophy and History of Science
Budapest University of Technology and Economics
Effective causality: the emergence of causal anomalies in effective theories
One interesting type of causal anomalies is the precedence of causes by their effects. These anomalies are often attributed to quantum physics where the formal systems of these theories sometimes entail an inverse sequence of the causal relata.
There are at least 4 popular strategies for eliminating these anomalies. The first is to revise our everyday notion of causation and claim that the original sequence of cause and effect is sometimes reversed (backward causation). The defender of this strategy needs to provide solutions for the bootstrap and the consistency paradoxes. A similar strategy is to claim that causation does not require time (Baron and Miller 2014), therefore, concerning causation, the temporal order of the causal relata does not make any difference. This solution would be in accordance with physical theories since eliminating the time arrow problem would bypass the classical Russellian (1913) argument for the claim that causation is not part of physics. As an alternative to these revisionist strategies one could claim that temporal order is a necessary feature of causation and this is why causation is not part of physical theories therefore cause and effect do not make sense in physics. Since this way, causal relata do not make sense in physics neither can their sequential order be represented in physical theories therefore the declaration of anomalies of their inverse order must be a conceptual mistake in physical theories. Consequently physical theories should not affect our notion of causation because they do not represent causal relata. A further way to clarify the problem of the inverse sequence of causal relata is to show that in certain theoretical contexts these anomalies emerge as peculiarities of the given theory’s methodology. We argue that this is the case in effective theories. Green’s function technology, extensively used to solve linear differential equations seems to have a crucial role in determining the causal structure of such theories. For the sake of conceptual clarity we apply the notion of acausality (following Polonyi) to cases where interactions are induced both forward and backward in time therefore no definite system time arrow is observed. Apparently the definition of Polonyi’s notion of acausality is wider than its use in philosophy because he refers to a notion of causality that is created by Wigner and is widely used to define causation in physics. Acausality in Polonyi’s sense includes both cases where time arrow disappears and when causal relata take reverse order. In philosophical discussions it is usually the former meaning that they attach to the notion of acausality while the latter is called backward causation. We will use these notions in their philosophical sense but Polonyi does not make this distinction.