2 problems

Benign cost-function conjecture. For each benign cost function $\mathbf{c}$, for each $B\models\mathbf{c}$, there is a c.e. set $A\models\mathbf{c}$ such that…

Let $\alpha$ be a computable limit ordinal, possibly with additional closure properties such as closure under addition. For an oracle $A$, let…