MMN-2080
Some orthogonality equation with two functions
Radoslaw Lukasik;Abstract
The aim of this paper is to describe the solution (f,g) of the equation
$$ = , x,y\in X,$$
where $f:X\to Y$, $g:X\to X$, $X,Y$ are inner product spaces over the same
field $\mathbb{K}\in \{ \mathbb{R},\mathbb{C} \}$g.
Vol. 18 (2017), No. 2, pp. 953-960