Functional equation;
Mean value theorem;
Linearly dependent functions;
QUADRATIC POLYNOMIALS;
PROPERTY;
D O I:
10.1007/s00010-018-0583-2
中图分类号:
O29 [应用数学];
学科分类号:
070104 ;
摘要:
The aim of this paper is to describe the solution (f, g) of the equation [f(x) - f(y)]g' (alpha x + (1 - alpha)y) = [g(x) - g(y)]f'(alpha x + (1 - alpha)y), x, y is an element of I, where I subset of R is an open interval, f, g : I -> R are differentiable, alpha is a fixed number from (0, 1).
机构:
Institute of Mathematics of the NAS of Ukraine, 3, Tereshchenkivska Str., KievInstitute of Mathematics of the NAS of Ukraine, 3, Tereshchenkivska Str., Kiev