A notion of resource-bounded Baire category is developed for the class P_(C[0,1]) of all polynomial-time computable real-valued functions on the unit interval. The meager subsets of P_(C[0,1]) are characterized in terms of resource-bounded Banach-Mazur games. This characterization is used to prove that, in the sense of Baire category, almost every function in P_(C[0,1]) is nowhere differentiable. This is a complexity-theoretic extension of the analogous classical result that Banach proved for the class C[0,1] in 1931.
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