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first-order and higher-order logic, model theory, set theory, proof theory, computability theory, formal languages, definability, interplay of syntax and semantics, constructive logic, intuitionism, philosophical logic, modal logic, completeness, Gödel incompleteness, decidability, undecidability, theories of truth, truth revision, consistency.

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How to get the modern logic formulas in Principia Mathematica

Recently, we have contrived some procedures based on resolution method. So, we want to test these procedures. I know that many propositions are presented by logic formulas in Principia Mathematica. …
Xingxing He's user avatar