Portugaliae Mathematica
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Published online: 2013-12-31
Bounded theories for polyspace computability
Ricardo Bianconi[1], Gilda Ferreira[2] and Emmanuel Silva[3] (1) Universidade de São Paulo, Brazil(2) Universidade Lusófona de Humanidades e Tecnologias, Lisboa, Portugal
(3) Tribunal Regional Federal da 5ª Região, Recife, Brazil
We present theories of bounded arithmetic and weak analysis whose provably total functions (with appropriate graphs) are the polyspace computable functions. More precisely, inspired in Ferreira’s systems $\mathsf{PTCA}$, $\mathsf{\Sigma^{b}_1}\textbf{-}\mathsf{NIA}$ and $\mathsf{BTFA}$ in the polytime framework, we propose analogue theories concerning polyspace computability. Since the techniques we employ in the characterization of $\mathsf{PSPACE}$ via formal systems (e.g. Herbrand’s theorem, cut-elimination theorem and the expansion of models) are similar to the ones involved in the polytime setting, we focus on what is specific of polyspace and explains the lift from $\mathsf{PTIME}$ to $\mathsf{PSPACE}$.
Keywords: Bounded arithmetic, weak analysis, polyspace computability, conservation results, cut-elimination
Bianconi Ricardo, Ferreira Gilda, Silva Emmanuel: Bounded theories for polyspace computability. Port. Math. 70 (2013), 295-318. doi: 10.4171/PM/1936