James Ladyman (2007), Stanford Encyclopedia of Philosophy (ed. Edward N. Zalta et al.); substantive revision 2023-05-18 — https://plato.stanford.edu/entries/structural-realism/
Key takeaways
- The entry presents structural realism (Worrall 1989) as the attempt to keep both the no-miracles argument and the pessimistic meta-induction: what survives theory change, and what we are entitled to believe, is a theory’s mathematical or relational structure. It then separates an epistemic version (we can know only structure) from an ontic version (structure is all there is). The ontic version is motivated by quantum individuality, gauge symmetry and spacetime physics, and faces the “relations without relata” objection.
Seeded from the abstract and a skim, before the reading in NOTE-038. What follows is what the work says about itself.
The entry calls structural realism, by the lights of many realists and antirealists, the most defensible form of scientific realism, and surveys the field. It covers the realism debate the view responds to, the epistemic (ESR) and ontic (OSR) forms and their variants, their connections to case studies in physics and to metaphysics, logic and philosophy of mathematics, the main objections, and related structuralisms in other areas.
Standing in the record
Filed from the survey of 2026-09-25 of work the anthology set aside as out of scope (tier C): 385 seconds of active reading over 1 session in the papers-feed tracker. It was filed Deferred, unread. NOTE-038 is the close reading of 2026-09-25, and it placed the work: Active — the standard map of the structural-realism literature, written by the founder of OSR. Read §2 for the theory-change argument, §3.2 for the Newman problem and §4’s seven OSR theses. Treat §5’s rebuttals as the author’s position, not as the field’s settled view.
When seeded, before the reading in NOTE-038, the entry gave a priority for a deeper reading: medium — It is a comprehensive, authoritative survey, and filing it forces a vocabulary decision (a philosophy-of-science topic). The skim captures its map, but not the arguments in §3.2 and §5 in detail (t = 385 s, 1 session).
What the seeding asked a deeper reading to check (NOTE-038 is that reading):
- The survey marks this “needs new topic: philosophy-of-science”. That is right: the entry’s primary subject is philosophy of science, which the closed vocabulary lacks (
none — wants: philosophy-of-science).metaphysics(OSR is explicitly a metaphysical thesis) andquantum-foundations(§4.1–4.2) are justified secondary tags.identitymay also bind, through §4.2’s individuality of particles. - For an ML-practice anthology its likely use is in the theory scheme. The “structure is what transfers across theory change” idea and the Ladyman–Ross real-patterns strand (information-theoretic ontology, §4.4 and §6) connect to arguments about what representations learn. A deeper reading should check which of those connections the entry actually makes and which are the reader’s own.
- As a review entry, it points to the primary sources to file: Worrall (1989), Ladyman (1998), and Ladyman & Ross (2007).
Access when seeded: Fetched the full SEP entry HTML: “First published Wed Nov 14, 2007; substantive revision Thu May 18, 2023” (citation meta: author Ladyman, James). I read the preamble, the table of contents and the opening of every section (§§1–6), plus targeted passages (Worrall on Fresnel/Maxwell, the Newman objection, the relata objection). I did not read it end to end. The SEP editor credit is from general knowledge and was not checked on the page.