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arXiv 0908.0070math.OA
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单位$C^*-$代数之间的Jordan $*-$同态

Jordan $*-$homomorphisms between unital $C^*-$algebras

M. Eshaghi Gordji

摘要:

设$A,B$是两个有单位元的$C^*-$代数。证明了对所有$u\in U(A)$,所有$y\in A$,所有$n = 0, 1, 2,...$,满足$h(3^nuy+3^nyu) = h(3^nu)h(y)+h(y)h(3^nu)$的几乎酉几乎线性映射$h:A\longrightarrow B$是Jordan同态.对于实秩为零的单位$C^*-$代数$A$,若$h(3^nuy+3^nyu) = h(3^nu)h(y)+h(y)h(3^nu)$对所有$u\in I_1(A_{sa})$,所有$y\in A,$和所有$n = 0, 1, 2,... ~$成立,则每个几乎单位几乎线性连续映射$h:A\longrightarrow B$是Jordan同态.进一步,我们利用不动点方法研究了有单位元的$C^*-$代数之间的Jordan $*-$同态的Hyers-Ulam-Rassias稳定性.

英文摘要:

Let $A,B$ be two unital $C^*-$algebras. We prove that every almost unital almost linear mapping $h:A\longrightarrow B$ which satisfies $h(3^nuy+3^nyu) = h(3^nu)h(y)+h(y)h(3^nu)$ for all $u\in U(A)$, all $y\in A$, and all $n = 0, 1, 2,...$, is a Jordan homomorphism. Also, for a unital $C^*-$algebra $A$ of real rank zero, every almost unital almost linear continuous mapping $h:A\longrightarrow B$ is a Jordan homomorphism when $h(3^nuy+3^nyu) = h(3^nu)h(y)+h(y)h(3^nu)$ holds for all $u\in I_1(A_{sa})$, all $y\in A,$ and all $n = 0, 1, 2,... ~$. Furthermore, we investigate the Hyers--Ulam--Rassias stability of Jordan $*-$homomorphisms between unital $C^*-$algebras by using the fixed points methods.

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