PRESERVATION OF UNBOUNDEDNESS AND THE CONSISTENCY OF b < s

نویسنده

  • VERA FISCHER
چکیده

Definition 1. Let f and g be functions in ω. We say that f is dominated by g iff there is some natural number n such that f ≤n g, i.e. (∀i ≥ n)(f(i) ≤ g(i)). Then <∗= ∪ ≤n is called the bounding relation on ω. If F is a family of functions in ω we say that F is dominated by the function g, and denote it by F <∗ g iff (∀f ∈ F)(f <∗ g). We say that F is unbounded (also not dominated) iff there is no function g ∈ ω which dominates it.

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تاریخ انتشار 2005