Jon, Jerry, List, My previous notes cited many references, and I doubt that people will read them all (any?).
But I presented some slides at a conference on Knowledge Graphs in May of 2020 (via Zoom because of covid), which I extended in July for a keynote talk at the European Semantic Web Conference, and added a few more slides in September. These slides introduce existential graphs and show how they can be used in a variety of ways: https://jfsowa.com/talks/eswc.pdf See slides 14 to 28 for an intro to EGs and a comparison with other notations used in linguistics and AI. For an extension for metalanguage, see slides 29 to 33. This notation can be used for Delta graphs and a wide variety of applications -- including all the examples that follow. The remaining slides cover many issues, including some that I discussed in my recent article on phaneroscopy. John
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