Namespaces
Variants
Actions

Identity matrix

From Encyclopedia of Mathematics
Revision as of 21:54, 10 January 2015 by Richard Pinch (talk | contribs) (Start article:Identity matrix)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

A square matrix $I$ with entries $1$ on the main diagonal and $0$ otherwise: $$ I_{ij} = \delta_{ij} $$ where $\delta$ is the Kronecker symbol.

It is the identity element in the matrix ring.

How to Cite This Entry:
Identity matrix. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Identity_matrix&oldid=39112