Rohmah, Miftakhul; Gemawati, Sri; Sirait, Asli
(2016-04-27)
An n×n matrix over a commutative ring with identity is clean if it is the sum of an
idempotent matrix and unit. This paper discusses necessary and sufficient criteria
for 2 × 2 matrix A =
[
a b
c d
]
, where a; b; ...