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Full Idea
We can take the theory of singleton functions, and hence set theory, and hence mathematics, to consist of generalisations about all singleton functions.
Gist of Idea
Mathematics is generalisations about singleton functions
Source
David Lewis (Mathematics is Megethology [1993], p.03)
Book Ref
-: 'Philosophia Mathematica' [-], p.3
A Reaction
At first glance this sounds like a fancy version of the somewhat discredited Greek idea that mathematics is built on the concept of a 'unit'.