On the equivalence conjecture for proof-theoretic harmony
The author discusses and analyzes the logical relations between three prominent accounts of harmony: harmony-as-conservative extension (see [\textit{N. Belnap}, Analysis 22, 130--134 (1962); \textit{M. Dummett}, The logical basis of metaphysics. Cambridge, MA: Harvard University Press (1991)]), harmony-as-levelling procedure (see [\textit{D. Prawitz}, Theoria 43, 2--40 (1977; Zbl 0361.02008); Dummett, loc. cit.]), and harmony-as-deductive equilibrium (see [\textit{N. Tennant}, Anti-realism and logic. Oxford: Oxford University Press (1987); The taming of the true. Oxford: Clarendon Press (1997; Zbl 0929.03001)], and concludes that there is no core notion of harmony toward which all three accounts of harmony converge.
scientific article; zbMATH DE number 6132726