Research articles
ScienceAsia 41(2015): 280288 doi:
10.2306/scienceasia15131874.2015.41.280
An alternative functional equation of Jensen type on groups
Choodech Srisawat, Nataphan Kitisin^{*}, Paisan Nakmahachalasint
ABSTRACT: Given an integer λ≠2, we establish the general solution of an alternative functional equation of Jensen type on certain groups. First, we give a criterion for the existence of the general solution for the functional equation f(xy^{−1})−2f(x)+f(xy)=0 or f(xy^{−1})−λf(x)+f(xy)=0, where f is a mapping from a group (G,⋅) to a uniquely divisible abelian group (H,+). Then we show that, for λ∉{0,−1,−2}, the above alternative functional equation is equivalent to the classical Jensen's functional equation. We also find the general solution in the case when G is a cyclic group and λ≠2 is an integer.
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Department of Mathematics and Computer Science, Faculty of Science, Chulalongkorn University, Bangkok 10330 Thailand 
* Corresponding author, Email: nataphan.k@chula.ac.th
Received 19 Feb 2015, Accepted 20 Aug 2015
