RT Journal Article T1 A Collapse Result in the Mereology of Properties A1 Gracia Di Rienzo, Alejandro K1 Existence monism K1 Mereology K1 Monism K1 Properties AB I examine five principles about the metaphysics of properties, each of which has been defended in the literature: (1) the sum of properties is their corresponding conjunctive property, (2) the mereology of properties is classical, (3) properties are individuated by necessary co-instantiation, (4) sums of objects belonging to different categories do not belong to the category of any of their parts, and (5) there is at least a property necessarily instantiated by every individual. I prove that this package of views entails that there is exactly one property. Since this conclusion is highly implausible, I will discuss some ways of modifying the package in order to avoid it. PB Wiley YR 2026 FD 2026-01-21 LK https://hdl.handle.net/10347/46766 UL https://hdl.handle.net/10347/46766 LA eng NO Di Rienzo, A. G. (2026). A Collapse Result in the Mereology of Properties. Ratio, 1-9. https://doi.org/10.1111/rati.70017 NO This work was supported by Minsterio de Ciencia, Innovación y Universidades (Ministry of Universities), Spain (FPU20/07620—pre- doctoral research grant and PID2020-115482GB-I00—grant received by the research group Episteme at University of Santiago de Compostela). DS Minerva RD 18 abr 2026