Is it correct way to write sign sequence:

$\{a_i\}_{i=1}^N|a_i \in \{+1, -1\}$


I try writing the following: "Finite sequence of N elements when each element is +1 or -1". Am I right?


1 Answer 1


Yours seems to be fine. Alternative is to regard the sequence as a function $$a:\mathbb{N} \to \{-1,1\}.$$ That is, $a_n$ is a function that takes as an argument a natural number $n$ and indicates if this term is $-1$ or $1$.


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