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diff --git a/2021/10/casual.md b/2021/10/casual.md
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+Started building a toy CAS system called `casual`, in Rust, with S-Expr
+input/output syntaxt. Following
+
+* Cohen CAS books
+* `expreduce` (golang) documentation
+* Norvig LISP book term re-writing chapter
+* Hanson and Sussman "Software Design for Flexibility" pattern matching sections and syntax
+
+Another classic integral tool: [`SAINT`](http://logical.ai/auai/doc/doc-calculus.html)
diff --git a/2021/10/links.md b/2021/10/links.md
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+
+`scm` author has a rooftop thermal emission simulator: <http://people.csail.mit.edu/jaffer/SimRoof/>
diff --git a/2021/11/links.txt b/2021/11/links.txt
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+
+EinsteinPy
+https://docs.einsteinpy.org/en/stable/
+
+Computer Algebra Systems: A Practical Guide (199), edited by Michael Wester
+
+https://math.unm.edu/~wester/cas_review.html
+
+
+"Comparison of Polynomial-Oriented Computer Algebra Systems"
+http://web.archive.org/web/20110622070353/http://www.fordham.edu/lewis/cacomp.html
+http://web.archive.org/web/20060718160417/http://www.bway.net/~lewis/cacomp.ps
+
+A Review of CAS Mathematical Capabilities by Michael Wester
+
+music industry "record deal simulator" and "publishing simulator":
+https://dealsim.createos.app/
+https://pubsim.createos.app/
+
+---
+
+https://en.wikipedia.org/wiki/Mathematical_knowledge_management
+https://en.wikipedia.org/wiki/QED_manifesto
+
+"The QED Manifesto Revisited" (2007)
+http://mizar.org/trybulec65/8.pdf
+
+https://www.wolframfoundation.org/programs/computable-archive-of-mathematics.html
+
+video: Excerpts from documentary "Towards a Semantic Language of Mathematics"
+https://www.youtube.com/watch?v=HOtpVU4-FMc
+
+video: Towards a Semantic Language of Mathematics
+https://www.youtube.com/watch?v=psSyM1zp82k
diff --git a/2021/12/links.txt b/2021/12/links.txt
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+
+https://tree-sitter.github.io/tree-sitter/
+    parser framework and implementations for many programming languages
+    parser grammars are in javascript; codegen parsers are in C
+
+https://www.mathmlcentral.com/history.html