What is another word for scalar matrix?
Pronunciation: [skˈe͡ɪlə mˈe͡ɪtɹɪks] (IPA) 
A scalar matrix is a square matrix that has a diagonal of identical entries. In simple terms, a scalar matrix is a matrix in which every element a[i][j] is equal to a constant k if i=j, and zero if i≠j. There are different words that can be used as synonyms for a scalar matrix, such as unit matrix, identity matrix, or standard matrix. The unit matrix is the oldest term used, referring to the matrix having the same effect as multiplying the given matrix by the identity element. The identity matrix is an alternative name used in modern times, referring to the matrix that results from having no change in transformation. Finally, the standard matrix is used to refer to a matrix that results from applying the standard mathematical operations on the matrix's entries.
