35 citations · 36 across the 3 of their papers we have counts for
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Valeriy A. Faiziev, Prasanna K. Sahoo
Let S be a semigroup and X a Banach space. The functional equation ϕ(xyz)+ϕ(x)+ϕ(y)+ϕ(z)=ϕ(xy)+ϕ(yz)+ϕ(xz) is said to be stable for the pair (X,S) if and only i…