Editing Index notation (section)

{{Short description|Manner of referring to elements of arrays or tensors}}
{{redir|Subscript notation|other similarly named notations|Double-subscript notation|and|Double-letter voltage subscript notation}}
{{for|''index notation'', or ''indicial notation'' in relativity theory and abstract algebra|Einstein notation|abstract index notation}}
In [[mathematics]] and [[computer programming]], '''index notation''' is used to specify the elements of an array of numbers. The formalism of how indices are used varies according to the subject.  In particular, there are different methods for referring to the elements of a list, a [[Vector space|vector]], or a [[Matrix (mathematics)|matrix]], depending on whether one is writing a formal mathematical paper for publication, or when one is writing a [[computer program]].