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Single Idea 10221

[filed under theme 6. Mathematics / B. Foundations for Mathematics / 7. Mathematical Structuralism / c. Nominalist structuralism ]

Full Idea

The 'in re' view of structures is that there is no more to structures than the systems that exemplify them.

Clarification

'In re' means 'in the thing' (as opposed to 'ante rem', 'prior to the thing')

Gist of Idea

Is there is no more to structures than the systems that exemplify them?

Source

Stewart Shapiro (Philosophy of Mathematics [1997], 3.3)

Book Ref

Shapiro,Stewart: 'Philosophy of Mathematics:structure and ontology' [OUP 1997], p.85


A Reaction

I say there is more than just the systems, because we can abstract from them to a common structure, but that doesn't commit us to the existence of such a common structure.


The 13 ideas with the same theme [structuralism denying real objects or real structures]:

If mathematics is a logic of the possible, then questions of existence are not intrinsic to it [Badiou]
Modal structuralism says mathematics studies possible structures, which may or may not be actualised [Hellman, by Friend]
Statements of pure mathematics are elliptical for a sort of modal conditional [Hellman, by Chihara]
Modal structuralism can only judge possibility by 'possible' models [Shapiro on Hellman]
Maybe mathematical objects only have structural roles, and no intrinsic nature [Hellman]
Is there is no more to structures than the systems that exemplify them? [Shapiro]
Number statements are generalizations about number sequences, and are bound variables [Shapiro]
Structuralism and nominalism are normally rivals, but might work together [Burgess/Rosen]
We can replace existence of sets with possibility of constructing token sentences [Chihara, by MacBride]
Formalist Structuralism says the ontology is vacuous, or formal, or inference relations [Reck/Price]
Maybe we should talk of an infinity of 'possible' objects, to avoid arithmetic being vacuous [Reck/Price]
Structuralist says maths concerns concepts about base objects, not base objects themselves [Friend]
Structuralism focuses on relations, predicates and functions, with objects being inessential [Friend]