0 votes 0 votes Show that for $|\Sigma| = 1$, the Post correspondence problem is decidable, that is, there is an algorithm that can decide whether or not $(A, B)$ has a $\text{PC}$ solution for any given $(A, B)$ on a single-letter alphabet. Theory of Computation peter-linz peter-linz-edition5 theory-of-computation decidability proof + – Rishi yadav asked Mar 16, 2019 Rishi yadav 210 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.