Modal logic, an extension of classical logic, investigates the modes of truth such as necessity and possibility. Its development has been closely intertwined with advances in proof theory, a field ...
This is a preview. Log in through your library . Journal Information The Journal of Symbolic Logic (JSL) was founded in 1936 and it has become the leading research journal in the field. It is issued ...
Studia Logica: An International Journal for Symbolic Logic, Vol. 103, No. 3 (June 2015), pp. 623-638 (16 pages) Within a weak system WKVS of intuitionistic analysis one may prove, using the Weak Fan ...
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