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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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R. Smullyan's "Lady or the tiger", Ch. 5, Island of Questioners, problems 11-12 [closed]
I cannot understand the context and formulation of these problems.
The inhabitants ask only questions answerable by yes or
no. Each inhabitant is one of two types, A and B. Those of
type A ask only q …