On the Invariance Equation for Heinz Means
نویسنده
چکیده
We solve the so-called invariance equation in the class of Heinz means, that is, we give necessary and sufficient conditions for the constants 0 p,q,r 1 such that the identity Hp(Hq(x,y),Hr(x,y)) = Hp(x,y) (x,y ∈ R+) holds true where the Heinz mean Hp is defined for 0 p 1 as Hp(x,y) = xpy1−p + x1−pyp 2 . The Taylor expansion of the Heinz mean is used. Mathematics subject classification (2010): 26E60.
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