On n-th Roots of Normal Operators.
On roots of an element of a Banach algebra.
The Area Of Generalized Circle In The Hyperbolic Plane
On The Quadratic Functional
Remark on the Cauchy functional equation.
Functional Equation F(x+y) F(x-y) = F2(x) -F2(y) in n-dimensional Vector Space.
On the functional equation: T1(t+s) T2(t-s) = T3(t) T4(s).
On Bimorphisms and Quadratic Forms on Groups. (Short Communications).
On quadratic forms.
On The Functional Equation: T1(t+s) T2(t-s) = T3(t) T4(s)
On the Definition of a Quadratic Form
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