Dear all, our next speaker in the Philosophy of Science Colloquium organized by the Institute Vienna Circle is Jose Alejandro Fernandez Cuesta (Complutense University of Madrid), who will give a talk on November 13, 4.45-6.15 pm. All are welcome! ---------------------------------------------------------------------------------------- *Philosophy of Science Colloquium TALK: Jose Alejandro Fernandez Cuesta (Complutense University of Madrid)* Quantum Propositions and Logical Monism Philosophy of Science Colloquium The Institute Vienna Circle holds a Philosophy of Science Colloquium with talks by our present fellows. *Date:* 13/11/2025 *Time:*16h45 *Venue:*New Institute Building (NIG), Universitätsstraße 7, 1010 Wien, HS 2i *Abstract:* In this talk, I will briefly present the formalism of standard quantum logics (QLs) and examine /sui generis/ features that seem to set them apart from other non‑classical logics. I will focus on their being plausibly "discovered" and on their apparent lack of interpretative utility in the philosophy of physics. On the usual presentation, QLs are introduced via a set of experimental propositions ("physical qualities"), informally specified in natural language as a response to these peculiarities; this apparatus has been used to draw a tenuous link between the semantics of QLs and the interpretation of certain experimentally obtained yet conceptually problematic results in quantum mechanics. I argue that this apparatus is philosophically relevant only under a prior commitment to logical monism –indeed, logical monism holds iff the experimental‑propositions apparatus is in place– and I offer several critiques of both. Rejecting both the monist commitment and the apparatus allows a reassessment of the sui generis properties of QLs and their philosophical interpretation.