Chapter 4: On MDS Symbol-Pair Distances of Constacyclic Codes of Length $ 2p^s$ over $\Re $

In this Chapter, we compute the symbol-pair distances of all $\Lambda$-constacyclic codes of length $2p^s$ over ${\Re}$ for any invertible element $\Lambda$ of ${\Re}$. We identify all symbol-pair MDS constacyclic codes of length $2p^s$ over ${\Re}$.