Context: As early as 1934, Popper wrote of the search for truth as "one of the strongest motives for scientific discovery." Still, he describes in Objective Knowledge (1972) early concerns about the much-criticised notion of truth as correspondence. Then came the semantic theory of truth formulated by the logician Alfred Tarski and published in 1933. Popper writes of learning in 1935 of the consequences of Tarski's theory, to his intense joy. The theory met critical objections to truth as correspondence and thereby rehabilitated it. The theory also seemed, in Popper's eyes, to support metaphysical realism and the regulative idea of a search for truth.

Question: Whose theory of truth did Popper read with intense interest in 1935?
Answer: Alfred Tarski

Question: What theory of interest to Popper did Alfred Tarski publish in 1933?
Answer: semantic theory of truth

Question: Tarski's theory overcame certain objections to what conception of truth?
Answer: truth as correspondence

Question: What kind of realism did Popper believe Tarski's theory supported?
Answer: metaphysical

Question: What did Popper write about before 1934?
Answer: Unanswerable

Question: Whose theory of truth did Alfred Tarski read in 1935?
Answer: Unanswerable

Question: What seemed to disprove metaphysical realism and the regulative idea of a search for truth to Popper?
Answer: Unanswerable

Question: What did Tarski write about the search for truth in 1934?
Answer: Unanswerable

Question: What book by Alfred Tarski was published in 1972?
Answer: Unanswerable