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Set-Theoretic Types from Scratch

Creator of Elixir

1:02:16·2026·graduate level·Conference Talk

José Valim delves into the foundational concepts of set-theoretic type systems, demonstrating their construction through live coding for the Elixir language.

This talk was recorded at Code BEAM Europe 2026. Check our upcoming events at https://codebeameurope.com/

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Elixir v1.20 was announced as "now officially a gradually typed language", thanks to its set-theoretic type system. However, what exactly are set-theoretic types? How do they work?

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