Combining Texts

All the ideas for 'Leibniz', 'A priori/A posteriori' and 'Structuralism Reconsidered'

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4 ideas

6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / d. Natural numbers

8923	Numbers are identified by their main properties and relations, involving the successor function [MacBride]
	Full Idea: The mathematically significant properties and relations of natural numbers arise from the successor function that orders them; the natural numbers are identified simply as the objects that answer to this basic function.
	From: Fraser MacBride (Structuralism Reconsidered [2007], §1)
	A reaction: So Julius Caesar would be a number if he was the successor of Pompey the Great? I would have thought that counting should be mentioned - cardinality as well as ordinality. Presumably Peano's Axioms are being referred to.

6. Mathematics / B. Foundations for Mathematics / 7. Mathematical Structuralism / e. Structuralism critique

8926	For mathematical objects to be positions, positions themselves must exist first [MacBride]
	Full Idea: The identification of mathematical objects with positions in structures rests upon the prior credibility of the thesis that positions are objects in their own right.
	From: Fraser MacBride (Structuralism Reconsidered [2007], §3)
	A reaction: Sounds devastating, but something has to get the whole thing off the ground. This is why Resnik's word 'patterns' is so appealing. Patterns stare you in the face, and they don't change if all the objects making it up are replaced by others.

9. Objects / F. Identity among Objects / 7. Indiscernible Objects

7566	The Identity of Indiscernibles is really the same as the verification principle [Jolley]
	Full Idea: Various writers have noted that the Identity of Indiscernibles is really tantamount to the verification principle.
	From: Nicholas Jolley (Leibniz [2005], Ch.3)
	A reaction: Both principles are false, because they are the classic confusion of epistemology and ontology. The fact that you cannot 'discern' a difference between two things doesn't mean that there is no difference. Things beyond verification can still be discussed.

12. Knowledge Sources / A. A Priori Knowledge / 10. A Priori as Subjective

3913	Maybe imagination is the source of a priori justification [Casullo]
	Full Idea: Some maintain that experiments in imagination are the source of a priori justification.
	From: Albert Casullo (A priori/A posteriori [1992], p.1)
	A reaction: What else could assessments of possibility and necessity be based on except imagination?