Fundamental notions of analysis in subsystems of second-order arithmetic


We develop fundamental aspects of the theory of metric, Hilbert, and Banach spaces in the context of subsystems of second-order arithmetic. In particular, we explore issues having to do with distances, closed subsets and subspaces, closures, bases, norms, and projections. We pay close attention to variations that arise when formalizing definitions and… (More)
DOI: 10.1016/j.apal.2005.03.004