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Single Idea 8744
[filed under theme 6. Mathematics / C. Sources of Mathematics / 6. Logicism / d. Logicism critique
]
Full Idea
The thesis that principles of arithmetic are derivable from the laws of logic runs against a now common view that logic itself has no ontology. There are no particular logical objects. From this perspective logicism is a non-starter.
Gist of Idea
Logicism seems to be a non-starter if (as is widely held) logic has no ontology of its own
Source
Stewart Shapiro (Thinking About Mathematics [2000], 5.1)
Book Ref
Shapiro,Stewart: 'Thinking About Mathematics' [OUP 2000], p.113
A Reaction
This criticism strikes me as utterly devastating. There are two routes to go: prove that logic does have an ontology of objects (what would they be?), or - better - deny that arithmetic contains any 'objects'. Or give up logicism.
The
15 ideas
from 'Thinking About Mathematics'
8725
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Rationalism tries to apply mathematical methodology to all of knowledge
[Shapiro]
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8730
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'Impredicative' definitions refer to the thing being described
[Shapiro]
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8729
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Intuitionists deny excluded middle, because it is committed to transcendent truth or objects
[Shapiro]
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8731
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Conceptualist are just realists or idealist or nominalists, depending on their view of concepts
[Shapiro]
|
8744
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Logicism seems to be a non-starter if (as is widely held) logic has no ontology of its own
[Shapiro]
|
8749
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Term Formalism says mathematics is just about symbols - but real numbers have no names
[Shapiro]
|
8750
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Game Formalism is just a matter of rules, like chess - but then why is it useful in science?
[Shapiro]
|
8752
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Deductivism says mathematics is logical consequences of uninterpreted axioms
[Shapiro]
|
8753
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Critics resent the way intuitionism cripples mathematics, but it allows new important distinctions
[Shapiro]
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8760
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Numbers do not exist independently; the essence of a number is its relations to other numbers
[Shapiro]
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8761
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A 'system' is related objects; a 'pattern' or 'structure' abstracts the pure relations from them
[Shapiro]
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8763
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The number 3 is presumably identical as a natural, an integer, a rational, a real, and complex
[Shapiro]
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8762
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Two definitions of 3 in terms of sets disagree over whether 1 is a member of 3
[Shapiro]
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8764
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Categories are the best foundation for mathematics
[Shapiro]
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18249
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Cauchy gave a formal definition of a converging sequence.
[Shapiro]
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