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Show HN: Εἶδος – A non-Turing-complete language built on Plato's Theory of Forms

https://github.com/realadeel/eidos
2•proletarian•3h ago
I've been reading Plato text and picking up some ancient Greek, and I had a useless thought experiment: what would a programming language look like with 4th century Athens constraints?

Εἶδος (Eidos — "Form") is one result. It's a declarative language called Λόγος where you don't execute code — you declare what exists. Forms belong to Kinds. Forms bear testimony. A law of correspondence maps petitions to answers. There are no loops, no conditionals, no mutation. It's intentionally not Turing-complete, aligned with Plato's rejection of the apeiron (the infinite).

It governs a real HTTP server (Ἱστός) where routes aren't matched by branching — they're recognized as Forms and answered according to law. An unrecognized path returns οὐκ ἔστιν ("it is not") — not an error, an ontological statement.

The project includes a parser that recognizes rather than executes, static verification expressed as philosophical propositions (Totality, Consistency, Well-formedness), Graphviz ontology diagrams, and a Socratic dialectic generator that examines the specification through the four phases of the elenchus.

The Jupyter notebook walks through everything interactively — from parsing the spec in polytonic Greek to petitioning the live server to watching Socrates interrogate the ontology.

https://github.com/realadeel/eidos

Comments

steve_gh•1h ago
Brilliant! Loving it as an idea.

Maybe what it needs is a testing framework - Σωκράτης (Socrates), that will demonstrate to you that everything you thought you knew about how your programme would behave (or the thought underpinning it) was at best problematic, or at worst just plain wrong!

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