Two cut-free sequent calculi which are conservative extensions of Visser's Formal Propositional Logic (FPL) are introduced. These satisfy a kind of subformula property and by this property the interpolation theorem for FPL are proved. These are analogies to Aghaei-Ardeshir's calculi for Visser's Basic Propositional Logic.
机构:
Nagoya City Univ, Sch Data Sci, Dept Data Sci, Takiko Campus,Yamanohata 1,Mizuho Cho,Mizuho Ku, Nagoya, Aichi 4678501, JapanNagoya City Univ, Sch Data Sci, Dept Data Sci, Takiko Campus,Yamanohata 1,Mizuho Cho,Mizuho Ku, Nagoya, Aichi 4678501, Japan