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user 486158
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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Question regarding ultrafilter extension of $\tau$-model
Since I'm not native speaker, my writing is probably difficult to read. Hence please point out any mistakes.
I'm reading page 96 and 97 of Modal Logic written by Patrick Blackburn.
$\textbf{Propositio …
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