Ideas from 'Mathematics is Megethology' by David Lewis [1993], by Theme Structure
[found in 'Philosophia Mathematica' (ed/tr ) [ ,]].
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4. Formal Logic / F. Set Theory ST / 1. Set Theory
10807

Mathematics reduces to set theory, which reduces, with some mereology, to the singleton function

4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
10809

We can accept the null set, but not a null class, a class lacking members

10811

The null set plays the role of last resort, for class abstracts and for existence

10812

The null set is not a little speck of sheer nothingness, a black hole in Reality

4. Formal Logic / F. Set Theory ST / 3. Types of Set / c. Unit (Singleton) Set
10813

What on earth is the relationship between a singleton and an element?

10814

Are all singletons exact intrinsic duplicates?

4. Formal Logic / G. Formal Mereology / 1. Mereology
10806

Megethology is the result of adding plural quantification to mereology

5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic
10816

We can use mereology to simulate quantification over relations

6. Mathematics / B. Foundations for Mathematics / 3. Axioms for Number / a. Axioms for numbers
10808

Mathematics is generalisations about singleton functions

6. Mathematics / B. Foundations for Mathematics / 6. Mathematical Structuralism / e. Structuralism critique
10815

We don't need 'abstract structures' to have structural truths about successor functions

9. Objects / C. Structure of Objects / 8. Parts of Objects / c. Wholes from parts
10810

I say that absolutely any things can have a mereological fusion
