Initial commit: 15-unit Lean 4 + PL semantics tutorial curriculum

references.md

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+# References
+
+## Primary Learning Resources
+
+| Abbr | Title | Link |
+|------|-------|------|
+| FPIL | *Functional Programming in Lean* | https://lean-lang.org/functional_programming_in_lean/ |
+| TPIL | *Theorem Proving in Lean 4* | https://leanprover.github.io/theorem_proving_in_lean4/ |
+| MiL | *Mathematics in Lean* | https://leanprover-community.github.io/mathematics_in_lean/ |
+
+## PL Semantics Formalizations in Lean 4
+
+| Resource | What it covers | Link |
+|----------|---------------|------|
+| syndikos/lean4-stlc | STLC: syntax, semantics, typing, metatheory (Progress + Preservation) | https://github.com/syndikos/lean4-stlc |
+| chenson2018/LeanScratch | Untyped λ-calculus: de Bruijn + locally nameless, confluence proofs | https://github.com/chenson2018/LeanScratch |
+| sdemos/type-inference | STLC + HM type inference, soundness & completeness of W | https://github.com/sdemos/type-inference |
+| rami3l/PLFaLean | PLFA Parts 2–3 translated to Lean 4 | https://github.com/rami3l/PLFaLean |
+
+## PL Theory (Non-Lean)
+
+| Resource | Format | Link |
+|----------|--------|------|
+| Software Foundations Vol.2 | Rocq book | https://softwarefoundations.cis.upenn.edu/ |
+| PLFA Part 2 | Agda book | https://plfa.github.io/ |
+| Chris Henson: Beginner Resources for Formalizing Lambda Calculi | Blog post | https://chrishenson.net/posts/2025-05-10-formalized_lambda_calculus.html |
+
+## HM Type System
+
+| Resource | Format | Link |
+|----------|--------|------|
+| Wikipedia: Hindley-Milner type system | Reference | https://en.wikipedia.org/wiki/Hindley%E2%80%93Milner_type_system |
+| Jeff Vaughan: "A proof of correctness for the HM type inference algorithm" | PDF (2008) | https://www.jeffvaughan.net/docs/hmproof.pdf |
+
+## Community
+
+- Official site: https://lean-lang.org/
+- Zulip chat: https://leanprover.zulipchat.com/
+- Lean 4 docs: https://lean-lang.org/documentation/