Let $A$ be a sequence of letters $\langle a,b,c,d,e,f \rangle$. I want to create two subsequences, one with the values with odd index and other with the values with even index: $A_\mathrm{odd} = \langle a,c,e \rangle$ and $A_\mathrm{even} = \langle b,d,f \rangle$.
My question is: is there any usual symbol that could substitute the words "odd" and "even" in the name of the subsequence?
Thanks!
Best Answer
"odd" and "even" are fine. Maybe in roman not italic, though: $$ A_{\rm{odd}} \ne A_{\rm{even}} $$ since the first subscript is not a product $odd$ of three factors.