# Article

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Keywords:
ordinary differential equations; linear differential equations; global transformations; functional equations
Summary:
The paper describes the general form of an ordinary differential equation of the second order which allows a nontrivial global transformation consisting of the change of the independent variable and of a nonvanishing factor. A result given by J. Aczél is generalized. A functional equation of the form \[ f(t,vy,wy+uvz)=f(x,y,z)u^{2}v+g(t,x,u,v,w)vz+h(t,x,u,v,w)y+2uwz \] is solved on \$\mathbb R\$ for \$y\ne 0\$, \$v\ne 0.\$
References:
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