Idempotent elements determined matrix algebras
Let M n ( R ) be the algebra of all n × n matrices over a unital commutative ring R with 2 invertible, V be an R-module. It is shown in this article that, if a symmetric bilinear map { · , · } from M n ( R ) × M n ( R ) to V satisfies the condition that { u , u } = { e , u } whenever u 2 = u , then...
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Published in | Linear algebra and its applications Vol. 435; no. 11; pp. 2889 - 2895 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier Inc
01.12.2011
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Let
M
n
(
R
)
be the algebra of all
n
×
n
matrices over a unital commutative ring
R with 2 invertible,
V be an
R-module. It is shown in this article that, if a symmetric bilinear map
{
·
,
·
}
from
M
n
(
R
)
×
M
n
(
R
)
to
V satisfies the condition that
{
u
,
u
}
=
{
e
,
u
}
whenever
u
2
=
u
, then there exists a linear map
f from
M
n
(
R
)
to
V such that
{
x
,
y
}
=
f
(
x
∘
y
)
,
∀
x
,
y
∈
M
n
(
R
)
. Applying the main result we prove that an invertible linear transformation
θ
on
M
n
(
R
)
preserves idempotent matrices if and only if it is a Jordan automorphism, and a linear transformation
δ
on
M
n
(
R
)
is a Jordan derivation if and only if it is Jordan derivable at all idempotent points. |
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ISSN: | 0024-3795 1873-1856 |
DOI: | 10.1016/j.laa.2011.05.002 |