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hatt v1.6.0 Release Notes

    • 📜 The Unicode symbols for logical connectives are now accepted by the parser and command-line program: ¬, ∧, ∨, → and ↔.
    • 💥 Breaking API change: the assignments function now takes a list of expressions rather than a single expression.
    • 🆕 New parser which handles operator precedence and associativity. This change entails a dependency bump: Parsec 3 is now required.
    • 🛠 Fixed a bug in the toNNF function: doubly-negated expressions are now converted into normal form rather than just having the double negation removed.
    • ➕ Added an equivalents function checking whether a list of propositions are all mutually equivalent.
    • ➕ Added an implies function checking whether a set of expressions semantically entail some expression.
    • ➕ Added a simplify function to the NormalForms module, which simplifies expressions by removing stronger disjuncts and weaker conjuncts, as well as some other simplifications.
    • The toCNF and toDNF functions now further simplify their output using the simplify function.
    • ✅ Limit number of expressions tested by QuickCheck to ensure the test suite runs quickly and doesn't eat the test machine.