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Let $G$ be a group and $\mathbb{C}$ the field of complex numbers. Suppose $\sigma : G \to G$ is an endomorphism satisfying $\sigma (\sigma (x)) = x$ for all $x$ in $G$. In this paper, we first determine the central solution, $f: G$ or $ G\times G \to \mathbb{C}$, of the functional equation \begin{align*} f(xy) + f(\sigma (y) x) = 2 f(x) + 2 f(y) \quad \text{for all } x, y \in G, \end{align*} which is a variant of the quadratic functional equation. Using the central solution of this functional equation, we determine the general solution of the functional equation $f(pr,qs)+f(sp,rq) = 2 f(p,q) + 2 f(r, s)$ for all $p, q, r, s \in G$, which is a variant of the equation $f(pr,qs)+f(ps,qr) = 2 f(p,q) + 2 f(r, s)$ studied by Chung, Kannappan, Ng and Sahoo in \cite{CKNS} (see also \cite{PKSPK}). Finally, we determine the solutions of this equation on the free groups generated by one element, the cyclic groups of order $m$, the symmetric groups of order $m$, and the dihedral groups of order $2m$ for $m \geq 2$.
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참고문헌 (20)
참고문헌 신청
C. T. Ng / 2013 / Kernel of the second order Cauchy difference on groups / Aequationes Math 86 (1-2) : 155 ~ 170
D. Yang / 2004 / The quadratic functional equation on groups / Publ. Math. Debrecen 66 (3) : 327 ~ 348
H. Stetkr / 2013 / Functional Equations on Groups / World Scientific Publishing
J. Aczel / 1963 / Uber eine gemeinsame Verallgemeinerung zweier Funktionalgleichungen von Jensen / Publ. Math. Debrecen 10 : 326 ~ 344
J. Aczel / 1965 / The general solution of two functional equations by reduction to functions additive in two variables and with aid of Hamel bases / Glasnik Mat.-Fiz. Astrono
D. Yang / 2004 / The quadratic functional equation on groups / Publ. Math. Debrecen 66 (3) : 327 ~ 348
H. Stetkr / 2013 / Functional Equations on Groups / World Scientific Publishing
J. Aczel / 1963 / Uber eine gemeinsame Verallgemeinerung zweier Funktionalgleichungen von Jensen / Publ. Math. Debrecen 10 : 326 ~ 344
J. Aczel / 1965 / The general solution of two functional equations by reduction to functions additive in two variables and with aid of Hamel bases / Glasnik Mat.-Fiz. Astrono
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