Contrasting the Halves of an Ahmad Pair

Karthik Ravishankar

We study Ahmad pairs in the $\hat{I}{\pounds }_2^0$ enumeration degrees. $(A,B)$ is an Ahmad pair if $A/{\le }_{e}B$ and every $Z{<}_{e}A$ satisfies $Z{\le }_{e}B$. We characterize the degrees that…