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title: "2024-06-26"
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- [x] Anki Flashcards
- [x] KoL
- [x] OGS
- [ ] Sheet Music (10 min.)
- [ ] Korean (Read 1 Story)

* Prove basic theorems on functions (chapter 3 of "Elements of Set Theory").
* Notes on substitution being well defined with respect to $\beta$-reductions.
* Finished chapter 5 ("Possible Worlds") of "An Introduction to Ontology".