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Phase 5: sort checking and the argument library - #7
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- Sort checker: every free name gets one type (individual, proposition, predicate over individuals/properties, property) across node formulas, proof lines, objections and definitions; runs before proof checking - Spec section on sorts; tests for inference and each class of clash - library/arguments/: Aquinas's First Way, the kalam cosmological argument (new, with two objections and replies) and the resurrection argument - examples/: modus ponens and a deliberately invalid argument showing the counterexample output - Gallery, playground, tests and README follow the new layout Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019WEmxyo9CRKSbjbEdCuJTG
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Stacked on #6. Implements Phase 5 of
ROADMAP.md. The first-order proof rules landed in Phase 3, so this phase adds what was still missing.src/core/types.cpp, spec indocs/spec/language.md§6): every free name gets exactly one type (individual, proposition, predicate, or property) across node formulas, proof lines, objections and definitions. Arity clashes, applying an individual variable, multi-place predicates used as terms, identity between properties, and λ over non-individuals are all errors. It runs before proof checking, so the proof rules never see ill-sorted formulas.library/arguments/(feeds the gallery): Aquinas's First Way, the kalam cosmological argument (new, fully proved, with two objections and replies), and the resurrection argument.examples/: modus ponens, plus a deliberately invalid "affirming the consequent" that showscounterexample Rain = false, Wet = true.66 test cases pass; the WASM and Playwright smoke tests pass against the new layout.
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