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On the traces of certain classes of permuting mappings in rings
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Abstract
Let R be a semiprime ring with center Z and extended centroid C. For a fixed integer n ≥ 2, the trace
δ
:
R
→
R
${\delta \colon R\rightarrow R}$
of a permuting n-additive mapping
D
:
R
n
→
R
${D\colon R^n\rightarrow R}$
is defined as
δ
(
x
)
=
D
(
x
,
...
,
x
)
${\delta (x)=D(x,\ldots ,x)}$
for all x ∈ R.
The notion of permuting n-derivation was introduced by Park
[J. Chungcheong Math. Soc. 22 (2009), no.3, 451–458] as follows:
a permuting n-additive mapping
Δ
:
R
n
→
R
${\Delta \colon R^n\rightarrow R}$
is said to be permuting n-derivation if
Δ
(
x
1
,
x
2
,
⋯
,
x
i
x
i
'
,
⋯
,
x
n
)
=
Δ
(
x
1
,
x
2
,
⋯
,
x
i
,
⋯
,
x
n
)
x
i
'
+
x
i
Δ
(
x
1
,
x
2
,
⋯
,
x
i
'
,
⋯
,
x
n
)
for
all
x
i
,
x
i
'
∈
R
.
$
\Delta (x_1,x_2,\dots , x_ix_i^{\prime },\dots , x_n)=\Delta (x_1,x_2,\dots , x_i,\dots , x_n)x_i^{\prime }+ x_i\Delta (x_1,x_2,\dots , x_i^{\prime },\dots , x_n)\quad \text{for all }x_i ,x_i^{\prime } \in R.
$
A permuting n-additive mapping
Ω
:
R
n
→
R
${\Omega \colon R^n\rightarrow R}$
is known to be
a permuting generalized n-derivation if there exists a permuting n-derivation
Δ
:
R
n
→
R
${\Delta \colon R^n\rightarrow R}$
such that
Ω
(
x
1
,
x
2
,
⋯
,
x
i
x
i
'
,
⋯
,
x
n
)
=
Ω
(
x
1
,
x
2
,
⋯
,
x
i
,
⋯
,
x
n
)
x
i
'
+
x
i
Δ
(
x
1
,
x
2
,
⋯
,
x
i
'
,
⋯
,
x
n
)
for
all
x
i
,
x
i
'
∈
R
.
$
\Omega (x_1,x_2,\dots , x_ix_i^{\prime },\dots , x_n)=\Omega (x_1,x_2,\dots , x_i,\dots , x_n)x_i^{\prime }+ x_i\Delta (x_1,x_2,\dots , x_i^{\prime },\dots , x_n)\quad \text{for all }x_i ,x_i^{\prime } \in R.
$
The main result of this paper states that if I is a nonzero ideal of a semiprime ring R and
Δ
:
R
n
→
R
${\Delta :R^n\rightarrow R}$
is a permuting n-derivation such that
Δ
(
I
,
...
,
I
)
≠
{
0
}
${\Delta (I,\ldots ,I)\ne \lbrace 0\rbrace }$
and
[
δ
(
x
)
,
x
]
=
0
${[\delta (x),x]=0}$
for all x ∈ I, where δ is the trace of Δ, then R contains a nonzero central ideal. Furthermore, some related results are also proven.
Walter de Gruyter GmbH
Title: On the traces of certain classes of permuting mappings in rings
Description:
Abstract
Let R be a semiprime ring with center Z and extended centroid C.
For a fixed integer n ≥ 2, the trace
δ
:
R
→
R
${\delta \colon R\rightarrow R}$
of a permuting n-additive mapping
D
:
R
n
→
R
${D\colon R^n\rightarrow R}$
is defined as
δ
(
x
)
=
D
(
x
,
.
,
x
)
${\delta (x)=D(x,\ldots ,x)}$
for all x ∈ R.
The notion of permuting n-derivation was introduced by Park
[J.
Chungcheong Math.
Soc.
22 (2009), no.
3, 451–458] as follows:
a permuting n-additive mapping
Δ
:
R
n
→
R
${\Delta \colon R^n\rightarrow R}$
is said to be permuting n-derivation if
Δ
(
x
1
,
x
2
,
⋯
,
x
i
x
i
'
,
⋯
,
x
n
)
=
Δ
(
x
1
,
x
2
,
⋯
,
x
i
,
⋯
,
x
n
)
x
i
'
+
x
i
Δ
(
x
1
,
x
2
,
⋯
,
x
i
'
,
⋯
,
x
n
)
for
all
x
i
,
x
i
'
∈
R
.
$
\Delta (x_1,x_2,\dots , x_ix_i^{\prime },\dots , x_n)=\Delta (x_1,x_2,\dots , x_i,\dots , x_n)x_i^{\prime }+ x_i\Delta (x_1,x_2,\dots , x_i^{\prime },\dots , x_n)\quad \text{for all }x_i ,x_i^{\prime } \in R.
$
A permuting n-additive mapping
Ω
:
R
n
→
R
${\Omega \colon R^n\rightarrow R}$
is known to be
a permuting generalized n-derivation if there exists a permuting n-derivation
Δ
:
R
n
→
R
${\Delta \colon R^n\rightarrow R}$
such that
Ω
(
x
1
,
x
2
,
⋯
,
x
i
x
i
'
,
⋯
,
x
n
)
=
Ω
(
x
1
,
x
2
,
⋯
,
x
i
,
⋯
,
x
n
)
x
i
'
+
x
i
Δ
(
x
1
,
x
2
,
⋯
,
x
i
'
,
⋯
,
x
n
)
for
all
x
i
,
x
i
'
∈
R
.
$
\Omega (x_1,x_2,\dots , x_ix_i^{\prime },\dots , x_n)=\Omega (x_1,x_2,\dots , x_i,\dots , x_n)x_i^{\prime }+ x_i\Delta (x_1,x_2,\dots , x_i^{\prime },\dots , x_n)\quad \text{for all }x_i ,x_i^{\prime } \in R.
$
The main result of this paper states that if I is a nonzero ideal of a semiprime ring R and
Δ
:
R
n
→
R
${\Delta :R^n\rightarrow R}$
is a permuting n-derivation such that
Δ
(
I
,
.
,
I
)
≠
{
0
}
${\Delta (I,\ldots ,I)\ne \lbrace 0\rbrace }$
and
[
δ
(
x
)
,
x
]
=
0
${[\delta (x),x]=0}$
for all x ∈ I, where δ is the trace of Δ, then R contains a nonzero central ideal.
Furthermore, some related results are also proven.
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