What happens when a subscript is on the outside of the parentheses?

When a subscript is placed outside parentheses in mathematical notation, it typically indicates that the subscript applies to the entire expression within the parentheses rather than to a specific variable or element inside. For example, if you see ( A_{(i)} ), it means that the entire expression ( A ) is being indexed by ( i ). This notation is often used in contexts like matrices or sequences where the entire group or set of values is being referenced collectively.