# On the Lebesgue Inequality on Classes of $\bar{\psi}$ -Differentiable Functions

@article{Zaderei2013OnTL,
title={On the Lebesgue Inequality on Classes of \$\bar\{\psi\} \$ -Differentiable Functions},
}
We consider the deviations of Fourier sums in the spaces ${C^{\bar{\psi}}}$. The estimates of these deviations are expressed via the best approximations of the $\bar{\psi}$ -derivatives of functions in the Stepanets sense. The sequences $\bar{\psi}$ = (ψ1, ψ2) are quasiconvex.