We generalize several classical results on the integrability of trigonometric series and relations among the best approximation and the coefficients of trigonom
We consider for a fixedμ,the class of polynomials Pn,μ,s:=P(z)=zs anzn-s+n-s∑j=μan-jzn-j-s;1≤μ≤n-s of degree n,having all zeros in|z|≤k,k≤1,with s-fold