Ideas of Paul Benacerraf, by Theme
[American, b.1931, Professor at Princeton University.]
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6. Mathematics / A. Nature of Mathematics / 1. Mathematics
9935

Mathematical truth is always compromising between ordinary language and sensible epistemology

6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / a. Numbers
13412

Obtaining numbers by abstraction is impossible  there are too many; only a rule could give them, in order

13413

We must explain how we know so many numbers, and recognise ones we haven't met before

9901

Numbers can't be sets if there is no agreement on which sets they are

9912

There are no such things as numbers

6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / c. Priority of numbers
13411

If numbers are basically the cardinals (FregeRussell view) you could know some numbers in isolation

9151

Benacerraf says numbers are defined by their natural ordering [Fine,K]

6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / f. Cardinal numbers
13891

To understand finite cardinals, it is necessary and sufficient to understand progressions [Wright,C]

17904

A set has k members if it oneone corresponds with the numbers less than or equal to k

17906

To explain numbers you must also explain cardinality, the counting of things

6. Mathematics / A. Nature of Mathematics / 4. Using Numbers / c. Counting procedure
9898

We can count intransitively (reciting numbers) without understanding transitive counting of items

17903

Someone can recite numbers but not know how to count things; but not vice versa

6. Mathematics / A. Nature of Mathematics / 4. Using Numbers / g. Applying mathematics
9897

The application of a system of numbers is counting and measurement

6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / a. Axioms for numbers
9900

For Zermelo 3 belongs to 17, but for Von Neumann it does not

9899

The successor of x is either x and all its members, or just the unit set of x

6. Mathematics / B. Foundations for Mathematics / 6. Mathematics as Set Theory / b. Mathematics is not set theory
8304

No particular pair of sets can tell us what 'two' is, just by onetoone correlation [Lowe]

9906

If ordinal numbers are 'reducible to' some settheory, then which is which?

8697

Disputes about mathematical objects seem irrelevant, and mathematicians cannot resolve them [Friend]

6. Mathematics / B. Foundations for Mathematics / 7. Mathematical Structuralism / a. Structuralism
13415

An adequate account of a number must relate it to its series

9907

If any recursive sequence will explain ordinals, then it seems to be the structure which matters

9908

The job is done by the whole system of numbers, so numbers are not objects

9909

The number 3 defines the role of being third in a progression

9911

Number words no more have referents than do the parts of a ruler

8925

Mathematical objects only have properties relating them to other 'elements' of the same structure

9938

How can numbers be objects if order is their only property? [Putnam]

6. Mathematics / C. Sources of Mathematics / 1. Mathematical Platonism / b. Against mathematical platonism
9910

Numberasobjects works wholesale, but fails utterly object by object

17927

Realists have semantics without epistemology, antirealists epistemology but bad semantics [Colyvan]

9936

The platonist view of mathematics doesn't fit our epistemology very well

6. Mathematics / C. Sources of Mathematics / 5. Numbers as Adjectival
9903

Number words are not predicates, as they function very differently from adjectives

6. Mathematics / C. Sources of Mathematics / 6. Logicism / d. Logicism critique
9904

The settheory paradoxes mean that 17 can't be the class of all classes with 17 members

9. Objects / F. Identity among Objects / 6. Identity between Objects
9905

Identity statements make sense only if there are possible individuating conditions
